July 2015 flood attack - Revision history

252c9bf7f381f340: Fix tx cite template

2023-07-23T13:27:53Z

Fix tx cite template

← Older revision		Revision as of 13:27, 23 July 2023
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	Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds verifying one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds verifying one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|~~id=~~9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>		[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>

	As a result of this attack, most mining pools updated their software to produce 1 MB blocks, as originally most capped their blocks at sizes such as 250 kB or 750 kB. The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>		As a result of this attack, most mining pools updated their software to produce 1 MB blocks, as originally most capped their blocks at sizes such as 250 kB or 750 kB. The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>

Taras at 09:10, 10 August 2017

2017-08-10T09:10:50Z

← Older revision		Revision as of 09:10, 10 August 2017
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	The '''July 2015 [[flood attack]]''' was a large "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.		The '''July 2015 [[flood attack]]''' was a large "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.

	Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds verifying one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>		[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>

	The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>		As a result of this attack, most mining pools updated their software to produce 1 MB blocks, as originally most capped their blocks at sizes such as 250 kB or 750 kB. The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>

	==Motivation==		==Motivation==
Line 17:		Line 17:
	[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>

	~~Redditor /u/TheGiv3r~~ has published the private keys to hundreds of addresses which have been recipients of dust outputs in 2013, perhaps in an attempt to incite additional spam as redditors try to claim the funds.<ref>{{cite reddit\|r=Bitcoin\|id=3cf6qg\|title=Need help moving coins to new address\|post=https://www.reddit.com/r/Bitcoin/comments/3cf6qg/need_help_moving_coins_to_new_address/csuyyi3\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3chere\|title=Stress Test Giveaway\|date=7 July 2015}}</ref>		A redditor has published the private keys to hundreds of addresses which have been recipients of dust outputs in 2013, perhaps in an attempt to incite additional spam as redditors try to claim the funds.<ref>{{cite reddit\|r=Bitcoin\|id=3cf6qg\|title=Need help moving coins to new address\|post=https://www.reddit.com/r/Bitcoin/comments/3cf6qg/need_help_moving_coins_to_new_address/csuyyi3\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3chere\|title=Stress Test Giveaway\|date=7 July 2015}}</ref>

	[[Satoshi Nakamoto]] has been (perhaps jokingly) ~~labelled~~ a suspect,<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw750p}}</ref> as he had mentioned that the block size should be increased when it is needed<ref>{{cite btct\|id=1347\|title=(PATCH) increase block size limit\|date=3 October 2010\|post=15139}}</ref> and may be campaigning for this change without revealing his involvement.		[[Satoshi Nakamoto]] has been (perhaps jokingly) labeled a suspect,<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw750p}}</ref> as he had mentioned that the block size should be increased when it is needed<ref>{{cite btct\|id=1347\|title=(PATCH) increase block size limit\|date=3 October 2010\|post=15139}}</ref> and may be campaigning for this change without revealing his involvement.
	==References==		==References==
	<references/>		<references/>
	[[Category:2015 events]]		[[Category:2015 events]]

Taras at 05:17, 15 July 2015

2015-07-15T05:17:43Z

← Older revision		Revision as of 05:17, 15 July 2015
Line 1:		Line 1:
	~~{{current}}~~		The '''July 2015 [[flood attack]]''' was a large "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.
	The '''July 2015 [[flood attack]]''' ~~is an ongoing~~ "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.

	Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes ~~report~~ having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>		[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>

			The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>

	==Motivation==		==Motivation==
	The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>		The attackers may have had an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may have been attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>

	It is unlikely that the attack was used in an attempt to damage or shut down Bitcoin, as it appears to have been controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>		It is unlikely that the attack was used in an attempt to damage or shut down Bitcoin, as it appears to have been controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>

Taras at 17:12, 12 July 2015

2015-07-12T17:12:33Z

← Older revision		Revision as of 17:12, 12 July 2015
Line 3:		Line 3:

	Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

			[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>

	==Motivation==		==Motivation==
	The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>		The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>

	It is unlikely that the attack ~~is being~~ used in an attempt to damage or shut down Bitcoin, as it appears to be controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>		It is unlikely that the attack was used in an attempt to damage or shut down Bitcoin, as it appears to have been controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>

	==Suspects==		==Suspects==

Taras at 16:39, 10 July 2015

2015-07-10T16:39:23Z

← Older revision		Revision as of 16:39, 10 July 2015
Line 2:		Line 2:
	The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.		The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.

	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	==Motivation==		==Motivation==
	The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>		The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>

	It is unlikely that the attack is being used in an attempt to damage or shut down Bitcoin, as it appears to be controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref>		It is unlikely that the attack is being used in an attempt to damage or shut down Bitcoin, as it appears to be controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>

	==Suspects==		==Suspects==
	[[Coinwallet.eu]], who had executed the previous stress tests, may have something to do with this attack as one of ~~the~~ bitcoin addresses ~~has~~ been used in both efforts.<ref name="mb"/> However, Coinwallet.eu did not announce involvement in this attack, as they had in the stress tests.<ref name="mb"/><ref>{{cite btct\|id=1094865\|title=Ultimate Bitcoin Stress Test - Monday June 22nd - 13:00 GMT\|date=20 June 2015}}</ref>		[[Coinwallet.eu]], who had executed the previous stress tests, may have something to do with this attack as one of their bitcoin addresses had been used in both efforts.<ref name="mb"/> However, Coinwallet.eu did not announce involvement in this attack, as they had in the stress tests.<ref name="mb"/><ref>{{cite btct\|id=1094865\|title=Ultimate Bitcoin Stress Test - Monday June 22nd - 13:00 GMT\|date=20 June 2015}}</ref>

	[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>

Taras at 22:00, 9 July 2015

2015-07-09T22:00:46Z

← Older revision		Revision as of 22:00, 9 July 2015
Line 1:		Line 1:
	{{current}}		{{current}}
	The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>		The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.

	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> ~~leaving sites including [[Blockchain.info]]~~ and ~~[[TradeBlock]] temporarily impaired~~.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	==Motivation==		==Motivation==
Line 13:		Line 13:

	[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>

			Redditor /u/TheGiv3r has published the private keys to hundreds of addresses which have been recipients of dust outputs in 2013, perhaps in an attempt to incite additional spam as redditors try to claim the funds.<ref>{{cite reddit\|r=Bitcoin\|id=3cf6qg\|title=Need help moving coins to new address\|post=https://www.reddit.com/r/Bitcoin/comments/3cf6qg/need_help_moving_coins_to_new_address/csuyyi3\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3chere\|title=Stress Test Giveaway\|date=7 July 2015}}</ref>

	[[Satoshi Nakamoto]] has been (perhaps jokingly) labelled a suspect,<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw750p}}</ref> as he had mentioned that the block size should be increased when it is needed<ref>{{cite btct\|id=1347\|title=(PATCH) increase block size limit\|date=3 October 2010\|post=15139}}</ref> and may be campaigning for this change without revealing his involvement.		[[Satoshi Nakamoto]] has been (perhaps jokingly) labelled a suspect,<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw750p}}</ref> as he had mentioned that the block size should be increased when it is needed<ref>{{cite btct\|id=1347\|title=(PATCH) increase block size limit\|date=3 October 2010\|post=15139}}</ref> and may be campaigning for this change without revealing his involvement.

Taras at 21:43, 9 July 2015

2015-07-09T21:43:56Z

← Older revision		Revision as of 21:43, 9 July 2015
Line 2:		Line 2:
	The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>		The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>

	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made~~?utm_source=mbtwitter~~\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	==Motivation==		==Motivation==
	The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/>		The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>

			It is unlikely that the attack is being used in an attempt to damage or shut down Bitcoin, as it appears to be controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref>

	==Suspects==		==Suspects==

Taras at 21:25, 9 July 2015

2015-07-09T21:25:50Z

← Older revision		Revision as of 21:25, 9 July 2015
Line 1:		Line 1:
	{{current}}		{{current}}
	The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>		The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>

	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made?utm_source=mbtwitter\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made?utm_source=mbtwitter\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

			==Motivation==
			The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/>

	==Suspects==		==Suspects==
			[[Coinwallet.eu]], who had executed the previous stress tests, may have something to do with this attack as one of the bitcoin addresses has been used in both efforts.<ref name="mb"/> However, Coinwallet.eu did not announce involvement in this attack, as they had in the stress tests.<ref name="mb"/><ref>{{cite btct\|id=1094865\|title=Ultimate Bitcoin Stress Test - Monday June 22nd - 13:00 GMT\|date=20 June 2015}}</ref>

	[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>

Taras at 21:06, 9 July 2015

2015-07-09T21:06:18Z

← Older revision		Revision as of 21:06, 9 July 2015
Line 2:		Line 2:
	The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>		The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref>

	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made?utm_source=mbtwitter\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>
	==Suspects==		==Suspects==
	[[Peter Todd]] had offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in ~~the flood~~ attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>

	It has been ~~speculated that~~ the attack is the product of ~~[[mining pool]]s attempting to drive up transaction fees, providing additional income before the inevitable [[Halving day 2016~~\|~~subsidy halving]]~~.{{~~citation needed~~}}		[[Satoshi Nakamoto]] has been (perhaps jokingly) labelled a suspect,<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw750p}}</ref> as he had mentioned that the block size should be increased when it is needed<ref>{{cite btct\|id=1347\|title=(PATCH) increase block size limit\|date=3 October 2010\|post=15139}}</ref> and may be campaigning for this change without revealing his involvement.
	==References==		==References==
	<references/>		<references/>
	[[Category:2015 events]]		[[Category:2015 events]]

Taras at 00:02, 9 July 2015

2015-07-09T00:02:14Z

← Older revision		Revision as of 00:02, 9 July 2015
Line 4:		Line 4:
	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> leaving sites including [[Blockchain.info]] and [[TradeBlock]] temporarily impaired.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>
	==Suspects==		==Suspects==
	[[Peter Todd]] ~~may be a major contributor, as evidenced by a discussion involving him on [[/r/Buttcoin]], in which he offers~~ to execute a stress test for $7,000.<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> ~~Todd later denied participation~~ in the attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in the flood attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>

	It has ~~also~~ been speculated that the attack is the product of [[mining pool]]s ~~in an attempt~~ to drive up transaction fees, providing additional income before the inevitable [[Halving day 2016\|subsidy halving]].{{citation needed}}		It has been speculated that the attack is the product of [[mining pool]]s attempting to drive up transaction fees, providing additional income before the inevitable [[Halving day 2016\|subsidy halving]].{{citation needed}}
	==References==		==References==
	<references/>		<references/>
	[[Category:2015 events]]		[[Category:2015 events]]

← Older revision		Revision as of 13:27, 23 July 2023
Line 3:		Line 3:
	Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds verifying one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds verifying one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|~~id=~~9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>		[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>

	As a result of this attack, most mining pools updated their software to produce 1 MB blocks, as originally most capped their blocks at sizes such as 250 kB or 750 kB. The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>		As a result of this attack, most mining pools updated their software to produce 1 MB blocks, as originally most capped their blocks at sizes such as 250 kB or 750 kB. The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>

← Older revision		Revision as of 05:17, 15 July 2015
Line 1:		Line 1:
	~~{{current}}~~		The '''July 2015 [[flood attack]]''' was a large "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.
	The '''July 2015 [[flood attack]]''' ~~is an ongoing~~ "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.

	Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes ~~report~~ having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes reported having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>		[[Gregory Maxwell]] later contacted F2Pool, advising them to use the same signature for each input in the large transactions.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszhxqa}}</ref><ref>{{cite tx\|id=9fdbcf0ef9d8d00f66e47917f67cc5d78aec1ac786e2abb8d2facb4e4790aad6}}</ref> This made the transactions highly compressible and far easier to verify.<ref>{{cite reddit\|r=Bitcoin\|id=3cvw52\|title=Is this a self-interested or altruistically constructed block?\|date=11 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cvw52/is_this_a_selfinterested_or_altruistically/cszic86}}</ref>

			The attack seems to have concluded by July 15.<ref>{{cite reddit\|r=Bitcoin\|title=Transaction mempool back down to normal range: 7k tx.\|date=15 July 2015\|id=3dbu73}}</ref>

	==Motivation==		==Motivation==
	The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>		The attackers may have had an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may have been attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>

	It is unlikely that the attack was used in an attempt to damage or shut down Bitcoin, as it appears to have been controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>		It is unlikely that the attack was used in an attempt to damage or shut down Bitcoin, as it appears to have been controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>

← Older revision		Revision as of 16:39, 10 July 2015
Line 2:		Line 2:
	The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.		The '''July 2015 [[flood attack]]''' is an ongoing "stress test" of the Bitcoin network. The possibly distributed attack has provoked hundreds of thousands of [[transaction]]s, leaving over 80,000 in the [[mempool]] at one time.<ref>{{cite reddit\|r=Bitcoin\|id=3ck5z9\|title=80,000 Unconfirmed Transactions right now\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1113292\|title=28 000 unconfirmed TXs\|date=7 July 2015\|post=11823370}}</ref> The attack is subsequent to stress tests executed in June.

	Some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>		Some charities and organizations, including WikiLeaks and Voat, have received thousands of dust outputs.<ref>{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/wikileaks-is-now-a-target-in-the-massive-spam-attack-on-bitcoin\|title=WikiLeaks Is Now a Target In the Massive Spam Attack on Bitcoin\|accessdate=10 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref><ref name="ok">{{cite reddit\|r=technology\|id=3cs0ln\|title=Voat.co and Wikileaks under attack from Bitcoin spammers\|post=https://www.reddit.com/r/technology/comments/3cs0ln/voatco_and_wikileaks_under_attack_from_bitcoin/csyhbzt\|date=10 July 2015}}</ref> Additionally, some single-word [[brainwallet]]s ("password", "cat"<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvbnv4}}</ref>, etc.) have been the recipients of thousands of transactions, leaving 0.00001 BTC outputs. [[F2Pool]] has been concatenating these outputs in huge 1MB transactions.<ref>{{cite tx\|bb41a757f405890fb0f5856228e23b715702d714d59bf2b1feb70d8b2b4e3e08}}</ref><ref>{{cite tx\|5d8875ed1707cfee2221741b3144e575aec4e0d6412eeffe1e0fa07335f61311}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015}}</ref><ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015}}</ref> These transactions fill up an entire block on their own, and are far too large to be relayed by nodes; they have only been confirmed because F2Pool dedicated blocks to them.<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csvasnz}}</ref><ref name="mb">{{cite web\|last=Pearson\|first=Jordan\|date=9 July 2015\|url=http://motherboard.vice.com/read/the-mystery-behind-the-biggest-bitcoin-transaction-ever-made\|title=The Mystery Behind the Biggest Bitcoin Transaction Ever Made\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> Some nodes report having spent over 20 seconds on one of these transactions,<ref>{{cite reddit\|r=Bitcoin\|id=3cgft7\|title=Largest transaction ever mined, 999.657 KB. Consumes an entire block.\|date=7 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3cgft7/largest_transaction_ever_mined_999657_kb_consumes/csva1ei}}</ref> explaining momentary but extreme latency and downtime on block chain explorers.<ref>{{cite reddit\|r=Bitcoin\|id=3ckhcj\|title=Blockchain.info is 10 blocks behind the network\|date=8 July 2015}}</ref><ref>{{cite btct\|id=1112943\|title=New achivement. The biggest tx\|date=7 July 2015\|post=11823487}}</ref>

	==Motivation==		==Motivation==
	The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>		The attackers may have an agenda related to the [[blocksize debate]], attempting to demonstrate the infeasibility of 1MB blocks including transactions of hundreds of thousands of users.<ref name="mb"/> Specifically, the Chinese [[mining pool]]s ([[AntPool]], [[BW Mining]], [[F2Pool]], [[BTC China]], & [[Huobi]]) have expressed distaste towards [[Gavin Andresen]]'s proposals to increase the blocksize limit, citing concerns of relatively low bandwidth compared to that available in the United States and Europe.<ref name="mb"/><ref>{{cite web\|last=Pearson\|first=Jordan\|date=16 June 2015\|url=http://motherboard.vice.com/read/chinas-powerful-bitcoin-miners-say-their-bandwidth-sucks\|title=China's Powerful Bitcoin Miners Say Their Bandwidth Sucks\|accessdate=9 July 2015\|journal=Motherboard\|publisher=Vice Media LLC}}</ref> The flood attack may be attempting to discredit the pools, and subsequently force them off the network after the raised blocksize limit is in effect.<ref name="mb"/><ref>{{cite btct\|id=1089283\|title=Hearn's Worst Case Scenario: Checkpoints in XT to "ignore the longest chain"\|date=13 June 2015}}</ref>

	It is unlikely that the attack is being used in an attempt to damage or shut down Bitcoin, as it appears to be controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref>		It is unlikely that the attack is being used in an attempt to damage or shut down Bitcoin, as it appears to be controlled and benevolent.<ref name="mb"/><ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csvtpxk}}</ref> It has also resulted in the donation of over 30 BTC to various sites.<ref name="ok"/>

	==Suspects==		==Suspects==
	[[Coinwallet.eu]], who had executed the previous stress tests, may have something to do with this attack as one of ~~the~~ bitcoin addresses ~~has~~ been used in both efforts.<ref name="mb"/> However, Coinwallet.eu did not announce involvement in this attack, as they had in the stress tests.<ref name="mb"/><ref>{{cite btct\|id=1094865\|title=Ultimate Bitcoin Stress Test - Monday June 22nd - 13:00 GMT\|date=20 June 2015}}</ref>		[[Coinwallet.eu]], who had executed the previous stress tests, may have something to do with this attack as one of their bitcoin addresses had been used in both efforts.<ref name="mb"/> However, Coinwallet.eu did not announce involvement in this attack, as they had in the stress tests.<ref name="mb"/><ref>{{cite btct\|id=1094865\|title=Ultimate Bitcoin Stress Test - Monday June 22nd - 13:00 GMT\|date=20 June 2015}}</ref>

	[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>		[[Peter Todd]] had previously offered to execute a stress test for $7,000<ref>{{cite reddit\|r=Buttcoin\|id=3bk12f\|title=Why doesnt buttcoin start its own "stress test"?\|date=29 June 2015\|post=https://www.reddit.com/r/Buttcoin/comments/3bk12f/why_doesnt_buttcoin_start_its_own_stress_test/csn4nbz}}</ref> but he denies involvement in this attack.<ref>{{cite reddit\|r=Bitcoin\|id=3ci9av\|title=Could the recent attack on bitcoin be the product of a core developer?\|date=8 July 2015\|post=https://www.reddit.com/r/Bitcoin/comments/3ci9av/could_the_recent_attack_on_bitcoin_be_the_product/csw1e50?context=1}}</ref>