Bitcoin Wiki - User contributions [en]

Proof of work

2016-01-20T19:31:41Z

CryptoPrincess: added consensus and Stellar Consensus Protocol to the list of other algorithms.

A '''proof of work''' is a piece of data which is difficult (costly, time-consuming) to produce but easy for others to verify and which satisfies certain requirements. Producing a proof of work can be a random process with low probability so that a lot of trial and error is required ''on average'' before a valid proof of work is generated. Bitcoin uses the [[Hashcash]] proof of work.

One application of this idea is using [http://en.wikipedia.org/wiki/Hashcash hashcash] as a method to preventing email spam, requiring a proof of work on the email's contents (including the To address), on every email. Legitimate emails will be able to do the work to generate the proof easily (not much work is required for a single email), but mass spam emailers will have difficulty generating the required proofs (which would require huge computational resources).

Hashcash proofs of work are used in Bitcoin for block generation. In order for a block to be accepted by network participants, [[Mining|miners]] must complete a proof of work which covers all of the data in the block. The [[difficulty]] of this work is adjusted so as to limit the rate at which new blocks can be generated by the network to one every 10 minutes. Due to the very low probability of successful generation, this makes it unpredictable which worker computer in the network will be able to generate the next block.

For a block to be valid it must hash to a value less than the current [[target]]; this means that each block indicates that work has been done generating it. Each block contains the hash of the preceding block, thus each block has a [[block chain|chain]] of blocks that together contain a large amount of work. Changing a block (which can only be done by making a new block containing the same predecessor) requires regenerating all successors and redoing the work they contain. This protects the block chain from tampering.

The most widely used proof-of-work scheme is based on [https://en.wikipedia.org/wiki/SHA-2 SHA-256] and was introduced as a part of [[Bitcoin]]. Some other hashing algorithms that are used for proof-of-work include scrypt, Blake-256, CryptoNight,<ref>[https://cryptonote.org/inside.php#equal-proof-of-work Equal Proof-of-Work], Cryptonote.org</ref> HEFTY1, Quark, SHA-3, scrypt-jane, scrypt-n, and combinations thereof.

== Example ==

Let's say the base string that we are going to do work on is "Hello, world!". Our target is to find a variation of it that SHA-256 hashes to a value beginning with '000'. We vary the string by adding an integer value to the end called a [[nonce]] and incrementing it each time. Finding a match for "Hello, world!" takes us 4251 tries (but happens to have zeroes in the first four digits):

"Hello, world!0" => 1312af178c253f84028d480a6adc1e25e81caa44c749ec81976192e2ec934c64
"Hello, world!1" => e9afc424b79e4f6ab42d99c81156d3a17228d6e1eef4139be78e948a9332a7d8
"Hello, world!2" => ae37343a357a8297591625e7134cbea22f5928be8ca2a32aa475cf05fd4266b7
...
"Hello, world!4248" => 6e110d98b388e77e9c6f042ac6b497cec46660deef75a55ebc7cfdf65cc0b965
"Hello, world!4249" => c004190b822f1669cac8dc37e761cb73652e7832fb814565702245cf26ebb9e6
"Hello, world!4250" => 0000c3af42fc31103f1fdc0151fa747ff87349a4714df7cc52ea464e12dcd4e9

4251 hashes on a modern computer is not very much work (most computers can achieve at least 4 million hashes per second). Bitcoin automatically varies the [[difficulty]] (and thus the amount of work required to generate a block) to keep a roughly constant rate of block generation.

In Bitcoin things are a bit more complex, especially since the header contains the [http://en.wikipedia.org/wiki/Merkle_tree Merkle tree] which depends on the included [[transactions]]. This includes the generation transaction, a transaction "out of nowhere" to our own address, which in addition to providing the miner with incentive to do the work, also ensures that every miner hashes a unique data set.

== List of algorithms ==

=== Traditional proof of work ===
# hashcash with double iterated SHA256
# hashcash with [[scrypt]] internal hash
# [[Momentum]] birthday collision
# Cuckoo Cycle proof of work https://github.com/tromp/cuckoo
# Various other proof of works functions (e.g. [[Ethereum]] had a few candidates)

=== Proof of X ===
# [[Proof of Stake]]
# [[Proof of Burn]]

=== Consensus ===
# [https://www.stellar.org/papers/stellar-consensus-protocol.pdf Stellar Consensus Protocol]

[[Category:Vocabulary]]
[[Category:Proof-of-x]]

[[fr:Preuve de travail]]

==References==
[[Distribution of nonces and hashes]]
<references/>

Jed McCaleb

2016-01-07T17:42:58Z

CryptoPrincess:

[https://www.stellar.org/about/jed-mccaleb/ Jed McCaleb] created [https://en.wikipedia.org/wiki/EDonkey2000 eDonkey], one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. [https://ideamensch.com/jed-mccaleb/ Recognizing that the world’s financial infrastructure] is broken and that too many people are left without resources, he and [https://www.media.mit.edu/video/view/kim-2015-03-20 Joyce Kim] cofounded [[Stellar]], a universal financial network that aims to increase economic participation for all individuals, in 2014. d

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. He writes about the technical elements of the Stellar network on the Stellar.org blog (ex: [https://www.stellar.org/blog/multisig-and-simple-contracts-stellar/ Multisig and Simple Contracts]). <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. He is also an [https://intelligence.org/2015/12/15/jed-mccaleb-on-why-miri-matters/ advisor to MIRI], which researches artificial intelligence for positive impact.

== Press ==
* [http://www.technologyreview.com/news/536641/a-new-competitor-for-bitcoin-aims-to-be-faster-and-safer/ A New Competitor for Bitcoin Aims to Be Faster and Safer]
* [http://mbewumovement.com/2015/05/18/can-stellar-disrupt-the-stokvel-mbewu-meets-the-ceo-to-find-out/ Can Stellar disrupt the stokvel?]
* [http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/ New Digital Currency Aims to Unite Every Money System on Earth]
* [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ Jed McCaleb Talks Stellar's New Protocol for Consensus]

== Social Media/ Online ==
* [https://about.me/JedMcCaleb About.me]
* [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 LinkedIn]
* [https://www.crunchbase.com/person/jed-mccaleb Crunchbase]
* [https://github.com/jedmccaleb Github]
* [https://angel.co/jed-mccaleb Angel List]

[[Category:people]]

Jed McCaleb

2015-12-15T22:10:14Z

CryptoPrincess: added link to Jed's work with MIRI

[https://www.stellar.org/about/jed-mccaleb/ Jed McCaleb] created [https://en.wikipedia.org/wiki/EDonkey2000 eDonkey], one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he and [https://www.media.mit.edu/video/view/kim-2015-03-20 Joyce Kim] cofounded [[Stellar]], a universal financial network that aims to increase economic participation for all individuals, in 2014. d

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. He writes about the technical elements of the Stellar network on the Stellar.org blog (ex: [https://www.stellar.org/blog/multisig-and-simple-contracts-stellar/ Multisig and Simple Contracts]). <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. He is also an [https://intelligence.org/2015/12/15/jed-mccaleb-on-why-miri-matters/ advisor to MIRI], which researches artificial intelligence for positive impact.

== Press ==
* [http://www.technologyreview.com/news/536641/a-new-competitor-for-bitcoin-aims-to-be-faster-and-safer/ A New Competitor for Bitcoin Aims to Be Faster and Safer]
* [http://mbewumovement.com/2015/05/18/can-stellar-disrupt-the-stokvel-mbewu-meets-the-ceo-to-find-out/ Can Stellar disrupt the stokvel?]
* [http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/ New Digital Currency Aims to Unite Every Money System on Earth]
* [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ Jed McCaleb Talks Stellar's New Protocol for Consensus]

== Social Media/ Online ==
* [https://about.me/JedMcCaleb About.me]
* [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 LinkedIn]
* [https://www.crunchbase.com/person/jed-mccaleb Crunchbase]
* [https://github.com/jedmccaleb Github]
* [https://angel.co/jed-mccaleb Angel List]

[[Category:people]]

Joyce kim

2015-11-08T22:37:00Z

CryptoPrincess: Created page with "== Stellar cofounder == [https://www.stellar.org/about/joyce-kim/ Joyce Kim] is cofounder and executive director of Stellar. Joyce started out as an attorney at Sherman &..."

== Stellar cofounder ==
[https://www.stellar.org/about/joyce-kim/ Joyce Kim] is cofounder and executive director of [[Stellar]]. Joyce started out as an attorney at Sherman & Sterling and Wilmer Hale. She also worked pro bono at Sanctuary for Families and the Innocence Project. Joyce became CEO of Soompi in 2006 and cofounded simplehoney, a mobile commerce startup, in 2011. Before cofounding Stellar, Joyce was a VC at Freestyle Capital. She graduated from Cornell at 19, followed by graduate school at Harvard and Columbia Law School. Joyce is currently a Director’s Fellow at the MIT Media Lab.

== Press ==
* [http://blogs.wsj.com/digits/2015/10/09/tech-startups-chase-something-other-than-profits/ Tech startups chase something other than profits]
* [http://techcrunch.com/2015/11/04/this-week-on-bullish-how-to-be-nonprofit-on-purpose/ This week on bullish: how to be nonprofit on purpose]
* [http://www.fastcompany.com/3041790/strong-female-lead/the-woman-changing-how-money-moves-around-the-world The woman changing how money moves around the world]
* [http://bitcoinist.net/stellar-executive-director-joyce-kim-explains-stellar-at-the-future-of-money-and-technology-summit/ Stellar Executive Director Joyce Kim Explains Stellar at The Future of Money and Technology Summit.]

== Videos ==
* [https://vimeo.com/143660657 Millions of Transactions for 20 Cents]
* [https://www.youtube.com/watch?v=CLwR0mZc8OI Zapchain Interview]

== Social Profiles ==
* [http://poptech.org/people/joyce_kim Poptech]
* [https://www.sibos.com/conference/speakers/joyce-kim Sibos]
* [http://www.money2020.com/speaker/joyce-kim Money 20/20]
* [https://joycekim.wordpress.com/ Wordpress]
* [https://angel.co/joycekim Angel List]
* [https://www.crunchbase.com/person/joyce-kim Crunchbase]

Jed McCaleb

2015-11-08T22:05:06Z

CryptoPrincess: /* Social Media/ Online */

[https://www.stellar.org/about/jed-mccaleb/ Jed McCaleb] created [https://en.wikipedia.org/wiki/EDonkey2000 eDonkey], one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he and [https://www.media.mit.edu/video/view/kim-2015-03-20 Joyce Kim] cofounded [[Stellar]], a universal financial network that aims to increase economic participation for all individuals, in 2014. d

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. He writes about the technical elements of the Stellar network on the Stellar.org blog (ex: [https://www.stellar.org/blog/multisig-and-simple-contracts-stellar/ Multisig and Simple Contracts]). <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. He is also an advisor to MIRI, which researches artificial intelligence for positive impact.

== Press ==
* [http://www.technologyreview.com/news/536641/a-new-competitor-for-bitcoin-aims-to-be-faster-and-safer/ A New Competitor for Bitcoin Aims to Be Faster and Safer]
* [http://mbewumovement.com/2015/05/18/can-stellar-disrupt-the-stokvel-mbewu-meets-the-ceo-to-find-out/ Can Stellar disrupt the stokvel?]
* [http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/ New Digital Currency Aims to Unite Every Money System on Earth]
* [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ Jed McCaleb Talks Stellar's New Protocol for Consensus]

== Social Media/ Online ==
* [https://about.me/JedMcCaleb About.me]
* [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 LinkedIn]
* [https://www.crunchbase.com/person/jed-mccaleb Crunchbase]
* [https://github.com/jedmccaleb Github]
* [https://angel.co/jed-mccaleb Angel List]

[[Category:people]]

Jed McCaleb

2015-11-08T22:04:45Z

CryptoPrincess:

[https://www.stellar.org/about/jed-mccaleb/ Jed McCaleb] created [https://en.wikipedia.org/wiki/EDonkey2000 eDonkey], one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he and [https://www.media.mit.edu/video/view/kim-2015-03-20 Joyce Kim] cofounded [[Stellar]], a universal financial network that aims to increase economic participation for all individuals, in 2014. d

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. He writes about the technical elements of the Stellar network on the Stellar.org blog (ex: [https://www.stellar.org/blog/multisig-and-simple-contracts-stellar/ Multisig and Simple Contracts]). <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. He is also an advisor to MIRI, which researches artificial intelligence for positive impact.

== Press ==
* [http://www.technologyreview.com/news/536641/a-new-competitor-for-bitcoin-aims-to-be-faster-and-safer/ A New Competitor for Bitcoin Aims to Be Faster and Safer]
* [http://mbewumovement.com/2015/05/18/can-stellar-disrupt-the-stokvel-mbewu-meets-the-ceo-to-find-out/ Can Stellar disrupt the stokvel?]
* [http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/ New Digital Currency Aims to Unite Every Money System on Earth]
* [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ Jed McCaleb Talks Stellar's New Protocol for Consensus]

== Social Media/ Online ==
* [https://about.me/JedMcCaleb About.me
* [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 LinkedIn]
* [https://www.crunchbase.com/person/jed-mccaleb Crunchbase]
* [https://github.com/jedmccaleb Github]
* [https://angel.co/jed-mccaleb Angel List]

[[Category:people]]

Stellar

2015-11-05T01:08:00Z

CryptoPrincess: edited broken link

== The Stellar Network ==
Stellar is an open source protocol for value exchange. <ref>https://en.wikipedia.org/wiki/Stellar_(payment_network)</ref> It was founded in early 2014 by [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 Jed Mccaleb] and [https://www.crunchbase.com/person/joyce-kim Joyce Kim]. <ref>http://www.coindesk.com/mt-gox-ripple-founder-jed-mccaleb-unveils-project-stellar/</ref> <ref>http://www.ibtimes.co.uk/jed-mccalebs-stellar-project-gives-away-free-digital-currency-through-facebook-1459293</ref> <ref>http://blogs.wsj.com/moneybeat/2014/07/31/mt-gox-ripple-founder-unveils-stellar-a-new-digital-currency-project/</ref> <ref>http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/</ref> <ref>http://techcrunch.com/2014/07/31/stripe-backs-non-profit-decentralized-payment-network-stellar-from-mt-goxs-original-creator/</ref>The Stellar protocol is supported by a nonprofit, the Stellar Development Foundation. The Foundation’s mission is to expand financial access and literacy worldwide.

At launch, Stellar was based on the [[Ripple]]. After systemic problems with the existing consensus algorithm were discovered<ref>http://www.coindesk.com/stellars-joyce-kim-talks-launch-fork-future/</ref>, Stellar created an updated version of the protocol with a new consensus algorithm. The code and whitepaper for this new algorithm were released in April 2015. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref> <ref>http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/</ref> <ref>https://github.com/stellar/stellar-core</ref> <ref>https://www.stellar.org/papers/stellar-consensus-protocol.pdf</ref>

== Nonprofit Stellar.org ==

=== Joyce Kim ===
[https://www.stellar.org/about/joyce-kim/ Joyce Kim] was a VC at Freestyle Capital and an entrepreneur. Prior to that, she was an attorney at Wilmer Hale and Sherman & Sterling and pro bono at Sanctuary for Families and the Innocence Project. Joyce graduated from Cornell University at the age of 19, followed by graduate school at Harvard and Columbia Law School. She is also a Director’s Fellow at the [http://www.media.mit.edu/video/view/kim-2015-04-14-03 MIT Media Lab].

Joyce frequently speaks about [http://blogs.wsj.com/digits/2015/10/09/tech-startups-chase-something-other-than-profits/ tech nonprofits] and the [https://www.youtube.com/watch?v=8f98nmidUi8 social potential of the Stellar network].

=== Jed McCaleb ===
[https://www.crunchbase.com/person/jed-mccaleb Jed McCaleb] is a co-founder of Stellar Development Foundation. In 2000, [https://about.me/JedMcCaleb Jed] created e-Donkey which became one of the largest file-sharing networks in its time. He later created Mt. Gox, the first bitcoin exchange, which was subsequently sold and re-coded by its current owners.

Jed has been quoted on the Stellar Consensus Protocol (SCP) in publications like [http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/ Wired] and [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ Coindesk]

Stellar

2015-11-05T01:06:54Z

CryptoPrincess: added information about Stellar.org cofounders

== The Stellar Network ==
Stellar is an open source protocol for value exchange. <ref>https://en.wikipedia.org/wiki/Stellar_(payment_network)</ref> It was founded in early 2014 by [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 Jed Mccaleb] and [https://www.crunchbase.com/person/joyce-kim Joyce Kim]. <ref>http://www.coindesk.com/mt-gox-ripple-founder-jed-mccaleb-unveils-project-stellar/</ref> <ref>http://www.ibtimes.co.uk/jed-mccalebs-stellar-project-gives-away-free-digital-currency-through-facebook-1459293</ref> <ref>http://blogs.wsj.com/moneybeat/2014/07/31/mt-gox-ripple-founder-unveils-stellar-a-new-digital-currency-project/</ref> <ref>http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/</ref> <ref>http://techcrunch.com/2014/07/31/stripe-backs-non-profit-decentralized-payment-network-stellar-from-mt-goxs-original-creator/</ref>The Stellar protocol is supported by a nonprofit, the Stellar Development Foundation. The Foundation’s mission is to expand financial access and literacy worldwide.

At launch, Stellar was based on the [[Ripple]]. After systemic problems with the existing consensus algorithm were discovered<ref>http://www.coindesk.com/stellars-joyce-kim-talks-launch-fork-future/</ref>, Stellar created an updated version of the protocol with a new consensus algorithm. The code and whitepaper for this new algorithm were released in April 2015. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref> <ref>http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/</ref> <ref>https://github.com/stellar/stellar-core</ref> <ref>https://www.stellar.org/papers/stellar-consensus-protocol.pdf</ref>

== Nonprofit Stellar.org ==

=== Joyce Kim ===
[https://www.stellar.org/about/joyce-kim/ Joyce Kim] was a VC at Freestyle Capital and an entrepreneur. Prior to that, she was an attorney at Wilmer Hale and Sherman & Sterling and pro bono at Sanctuary for Families and the Innocence Project. Joyce graduated from Cornell University at the age of 19, followed by graduate school at Harvard and Columbia Law School. She is also a Director’s Fellow at the [http://www.media.mit.edu/video/view/kim-2015-04-14-03 MIT Media Lab].

Joyce frequently speaks about [http://blogs.wsj.com/digits/2015/10/09/tech-startups-chase-something-other-than-profits/ tech nonprofits] and the [https://www.youtube.com/watch?v=8f98nmidUi8 social potential of the Stellar network].

=== Jed McCaleb ===
[https://www.crunchbase.com/person/jed-mccaleb Jed McCaleb] is a co-founder of Stellar Development Foundation. In 2000, [https://about.me/JedMcCaleb Jed] created e-Donkey which became one of the largest file-sharing networks in its time. He later created Mt. Gox, the first bitcoin exchange, which was subsequently sold and re-coded by its current owners.

Jed has been quoted on the Stellar Consensus Protocol (SCP) in publications like [http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/ Wired] and [[http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/|Coindesk]]

Jed McCaleb

2015-11-02T05:51:08Z

CryptoPrincess: added links

[https://about.me/JedMcCaleb Jed McCaleb] created [https://en.wikipedia.org/wiki/EDonkey2000 eDonkey], one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he and [https://www.media.mit.edu/video/view/kim-2015-03-20 Joyce Kim] cofounded [[Stellar]], a [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ universal financial network] that aims to increase economic participation for all individuals, in 2014.

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. He writes about the technical elements of the Stellar network on the Stellar.org blog (ex: [https://www.stellar.org/blog/multisig-and-simple-contracts-stellar/ Multisig and Simple Contracts]). <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. He is also an advisor to MIRI, which researches artificial intelligence for positive impact.

[[Category:people]]

Jed McCaleb

2015-10-15T23:12:20Z

CryptoPrincess: add links

[https://about.me/JedMcCaleb Jed McCaleb] created eDonkey, one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he cofounded [[Stellar]], a [http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/ universal financial network] that aims to increase economic participation for all individuals, in 2014.

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. He is also an advisor to MIRI, which researches artificial intelligence for positive impact.

[[Category:people]]

Stellar

2015-07-01T20:39:57Z

CryptoPrincess:

Stellar is an open source protocol for value exchange. <ref>https://en.wikipedia.org/wiki/Stellar_(payment_network)</ref> It was founded in early 2014 by [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 Jed Mccaleb] and [https://www.crunchbase.com/person/joyce-kim Joyce Kim]. <ref>http://www.coindesk.com/mt-gox-ripple-founder-jed-mccaleb-unveils-project-stellar/</ref> <ref>http://www.ibtimes.co.uk/jed-mccalebs-stellar-project-gives-away-free-digital-currency-through-facebook-1459293</ref> <ref>http://blogs.wsj.com/moneybeat/2014/07/31/mt-gox-ripple-founder-unveils-stellar-a-new-digital-currency-project/</ref> <ref>http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/</ref> <ref>http://techcrunch.com/2014/07/31/stripe-backs-non-profit-decentralized-payment-network-stellar-from-mt-goxs-original-creator/</ref>The Stellar protocol is supported by a nonprofit, the Stellar Development Foundation. The Foundation’s mission is to expand financial access and literacy worldwide.

At launch, Stellar was based on the [[Ripple]]. After systemic problems with the existing consensus algorithm were discovered<ref>http://www.coindesk.com/stellars-joyce-kim-talks-launch-fork-future/</ref>, Stellar created an updated version of the protocol with a new consensus algorithm. The code and whitepaper for this new algorithm were released in April 2015. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref> <ref>http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/</ref> <ref>https://github.com/stellar/stellar-core</ref> <ref>https://www.stellar.org/papers/stellar-consensus-protocol.pdf</ref>

Stellar

2015-07-01T20:38:48Z

CryptoPrincess:

Stellar is an open source protocol for value exchange. <ref>https://en.wikipedia.org/wiki/Stellar_(payment_network)</ref> It was founded in early 2014 by [https://www.linkedin.com/pub/jed-mccaleb/0/2a4/405 Jed Mccaleb] and [https://www.crunchbase.com/person/joyce-kim Joyce Kim]. <ref>http://www.coindesk.com/mt-gox-ripple-founder-jed-mccaleb-unveils-project-stellar/</ref> <ref>http://www.ibtimes.co.uk/jed-mccalebs-stellar-project-gives-away-free-digital-currency-through-facebook-1459293</ref> <ref>http://blogs.wsj.com/moneybeat/2014/07/31/mt-gox-ripple-founder-unveils-stellar-a-new-digital-currency-project/</ref> <ref>http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/</ref> <ref>http://techcrunch.com/2014/07/31/stripe-backs-non-profit-decentralized-payment-network-stellar-from-mt-goxs-original-creator/</ref>The Stellar protocol is supported by a nonprofit, the Stellar Development Foundation. The Foundation’s mission is to expand financial access and literacy worldwide.

At launch, Stellar was based on the [[Ripple]]. After systemic problems with the existing consensus algorithm were discovered, Stellar created an updated version of the protocol with a new consensus algorithm. The code and whitepaper for this new algorithm were released in April 2015. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref> <ref>http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/</ref> <ref>https://github.com/stellar/stellar-core</ref> <ref>https://www.stellar.org/papers/stellar-consensus-protocol.pdf</ref>

Stellar

2015-07-01T20:34:12Z

CryptoPrincess: Added info about Stellar.org and the Stellar network

Stellar is an open source protocol for value exchange. <ref>https://en.wikipedia.org/wiki/Stellar_(payment_network)</ref> It was founded in early 2014 by Jed Mccaleb and Joyce Kim. <ref>http://www.coindesk.com/mt-gox-ripple-founder-jed-mccaleb-unveils-project-stellar/</ref> <ref>http://www.ibtimes.co.uk/jed-mccalebs-stellar-project-gives-away-free-digital-currency-through-facebook-1459293</ref> <ref>http://blogs.wsj.com/moneybeat/2014/07/31/mt-gox-ripple-founder-unveils-stellar-a-new-digital-currency-project/</ref> <ref>http://www.wired.com/2014/08/new-digital-currency-aims-to-unite-every-money-system-on-earth/</ref> <ref>http://techcrunch.com/2014/07/31/stripe-backs-non-profit-decentralized-payment-network-stellar-from-mt-goxs-original-creator/</ref>The Stellar protocol is supported by a nonprofit, the Stellar Development Foundation. The Foundation’s mission is to expand financial access and literacy worldwide.

At launch, Stellar was based on the Ripple. After systemic problems with the existing consensus algorithm were discovered, Stellar created an updated version of the protocol with a new consensus algorithm. The code and whitepaper for this new algorithm were released in April 2015. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref> <ref>http://www.coindesk.com/stellar-founder-jed-mccaleb-new-protocol/</ref> <ref>https://github.com/stellar/stellar-core</ref> <ref>https://www.stellar.org/papers/stellar-consensus-protocol.pdf</ref>

People

2015-06-30T03:42:02Z

CryptoPrincess: Added Jed McCaleb's current org

A short list of active contributors to Bitcoin, ordered by first name.

[[Andreas Schildbach]] ([https://profiles.google.com/andreas.schildbach Profile]) - original developer of [https://market.android.com/details?id=de.schildbach.wallet Bitcoin Wallet for Android] ([http://code.google.com/p/bitcoin-wallet/ Google Code Project]).

[[Amir Taaki]] ([http://en.wikipedia.org/wiki/Amir_Taaki Wikipedia]) aka genjix- creator of the [[BIP]] process, [[Libbitcoin]] C++ developer toolkit, [[Libbitcoin_Server|Obelisk]] blockchain server (later BS), [[Libbitcoin_Explorer|SX]] bitcoin command line tool (later BX), [https://bitcoinmagazine.com/7892/shedding-light-on-the-dark-wallet Darkwallet], [http://www.wired.com/2014/04/darkmarket Darkmarket] (later [https://openbazaar.org OpenBazaar]), [http://reason.com/blog/2015/02/24/darkleaks-the-decentralized-information Darkleaks], [[Freecoin]] and well as inactive/defunct projects such as the [[Britcoin]] exchange, [[Intersango]] exchange, [[Spesmilo]] RPC client, [[Bitcoin Consultancy]], Bitcoin Media Blog (author), [[Vibanko]] web wallet provider, [[GLBSE]] exchange client, [https://github.com/genjix/kartludox Kartludox] Bitcoin poker client, [[Pastecoin]] and Python bindings for Bitcoin.

[[ArtForz|Art Forz]]- developed the first GPU miner and at one time his GPU mining farm (the ArtFarm) was mining over a third of all blocks.

[[Gary Rowe]] ([https://plus.google.com/u/0/115295932487523951663/about Profile ]) - Contributor to the [[MultiBit]] (http://multibit.org) and [[BitCoinJ]] (http://code.google.com/p/bitcoinj/) projects. Working on various Bitcoin based businesses.

[[User:Gavinandresen|Gavin Andresen]] - ([https://profiles.google.com/u/0/gavinandresen/about Profile ]) Former [[Satoshi client]] maintainer. He previously worked at Silicon Graphics and now runs his own company.

[[Hal Finney]]- one of the creators of [http://en.wikipedia.org/wiki/Pretty_Good_Privacy PGP] and one of the earliest contributors to the Bitcoin project. First to identify a type of double-spending attack that now bears his name -- the [[Double-spending#Finney_attack|Finney attack]].

James McCarthy aka Nefario- creator of the first bitcoin stock exchange [[GLBSE]]

[[Jed McCaleb]], cofounder of Stellar.org and original developer of [[MtGox]]. Previously created [https://en.wikipedia.org/wiki/EDonkey2000 eDonkey2000].

[[Jeff Garzik]]- ([http://en.wikipedia.org/wiki/Jeff_Garzik Wikipedia]) [[Satoshi client]] core developer, GPU poold software and the founder of [[Bitcoin Watch]]. Works for BitPay.

[[Luke Dashjr]] aka Luke-Jr- [[Eligius]] founder, maintains [[BFGMiner]] and maintainer of [[bitcoind]]/[[Bitcoin-Qt]] stable branches.

[[Mark Karpeles]] ([https://en.wikipedia.org/wiki/Mark_Karpeles Wikipedia]) aka MagicalTux- Former owner of [[MtGox]] and this wiki.

[[Sirius|Martti Malmi]] aka Sirius- Former Bitcoin developer. Operates the domain names bitcoin.org and bitcointalk.org.

[[Matt Corallo]] aka BlueMatt- [[Satoshi client]] and [[Bitcoinj]] developer.

[[Michael Hendrix]] aka mndrix- creator of the now defunct CoinPal and CoinCard services

[[Michael Marquardt]] aka theymos- creator of the widely used blockexplorer.com site, and BitcoinTalk Forum

[[Mike Hearn]] ([https://profiles.google.com/mh.in.england/about Profile]) Google engineer who works on Gmail and developed [[BitCoinJ]] (http://code.google.com/p/bitcoinj/) and [[Lighthouse]].

[[User:Tcatm|Nils Schneider]] aka tcatm - Bitcoin developer, owner of BitcoinWatch, creator and owner of BitcoinCharts, GPU mining software and JS web interface.

[[Patrick McFarland]] aka Diablo-D3 - DiabloMiner author, and former BitcoinTalk forum moderator.

[[Patrick Strateman]] aka phantomcircuit - Bitcoin developer, creator of [[Intersango]], member of [[Bitcoin Consultancy]] and creator of Python Bitcoin implementation.

[[Peter Todd]] - Bitcoin developer. Involved with Bitcoin related startup [[Coinkite]] and [[DarkWallet]].

[[Pieter Wuille]] aka sipa- [[Satoshi client]] developer and maintainer of the network graphs http://bitcoin.sipa.be

[[Stefan Thomas]] aka justmoon- creator of the ([https://www.weusecoins.com We Use Coins]) site/video and WebCoin.

[[Tamas Blummer]] aka grau - author of Bits of Proof, the enterprise-ready implementation of the Bitcoin protocol. http://bitsofproof.com

[[Trace Mayer]] - Host of the ([http://www.bitcoin.kn Bitcoin Knowledge Podcast]) where the top people in Bitcoin are interviewed

[[Vladimir Marchenko]]- ([https://profiles.google.com/u/0/vmartchenko/about?hl=en Profile]), runs [[Marchenko Ltd]] which sells mining contracts, previously developed the figator.org search engine.

[[Wladimir J. van der Laan]] - [[Satoshi client]] maintainer.

==See Also==
* [[Original client developers]]
* [[Developers]]
* Wiki list of [[:Special:ListUsers|users]]
* [[Project:Community_portal|Community portal]]
* [[:Category:People]]

Jed McCaleb

2015-06-25T21:40:59Z

CryptoPrincess:

Jed McCaleb created eDonkey, one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he cofounded [[Stellar]], a universal financial network that aims to increase economic participation for all individuals, in 2014.

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. <ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. Jed is also an advisor to MIRI, which researches artificial intelligence for positive impact.

[[Category:people]]

Jed McCaleb

2015-06-25T21:39:49Z

CryptoPrincess: Added more detailed information about Jed's historical projects, and what he's doing now.

Jed McCaleb created eDonkey, one of the largest file-sharing networks of its time, as well as Mt. Gox, the first bitcoin exchange. In 2011, Jed founded [[Ripple]]. Recognizing that the world’s financial infrastructure is broken and that too many people are left without resources, he cofounded [[Stellar]], , a universal financial network that aims to increase economic participation for all individuals, in 2014.

Jed currently leads technical development of [https://github.com/jedmccaleb Stellar]. The Stellar network is supported by Stellar.org, a nonprofit that couples technology with digital financial literacy and contributes to open-source software<ref>http://www.wired.com/2015/04/stanford-prof-builds-algorithm-internet-money/</ref>. Jed is also an advisor to MIRI, which researches artificial intelligence for positive impact.

[[Category:people]]