ThomasV: adding my signature

2013-10-26T15:06:22Z

adding my signature

← Older revision		Revision as of 15:06, 26 October 2013
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	The first 4 or 12 bits of PREFIX encode the length of the metadata (0 to e, f00 to fff)		The first 4 or 12 bits of PREFIX encode the length of the metadata (0 to e, f00 to fff)

	The length of the metadata in bits is 4*(n+1) where n is the value that is encoded.		The length of the metadata in bits is 4*(n+1) where n is the value that is encoded in the first bits.

	The format of the metadata itself remains to be defined.		The format of the metadata itself remains to be defined.
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	* 2000 to 2fff		* 2000 to 2fff
	*etc.		*etc.

			[[User:ThomasV\|ThomasV]] ([[User talk:ThomasV\|talk]]) 15:06, 26 October 2013 (GMT)

ThomasV: Created page with "Here is a simple implementation of my proposal to 'mine' for a seed:

 from electrum import mnemonic import ecdsa import time import hmac import hashlib  PREFIX = "100" ..."

2013-10-26T14:56:56Z

Created page with "Here is a simple implementation of my proposal to 'mine' for a seed: <pre> from electrum import mnemonic import ecdsa import time import hmac import hashlib PREFIX = "100" ..."

New page

Here is a simple implementation of my proposal to 'mine' for a seed:

<pre>
from electrum import mnemonic
import ecdsa
import time
import hmac
import hashlib

PREFIX = "100"
n = len(PREFIX)
entropy = ecdsa.util.randrange( pow(2,160) )
nonce = 0

while True:
ss = "%040x"%(entropy+nonce)
s = hashlib.sha256(ss.decode('hex')).digest().encode('hex')
words = mnemonic.mn_encode(s)[0:13] # 13 random words
seed = ' '.join(words)
I = hmac.new("Bitcoin mnemonic", seed, hashlib.sha512).digest().encode('hex')
if I[0:n] == PREFIX:
break
nonce += 1

print seed
print I
</pre>

PREFIX contains metadata about the wallet version.

The first 4 or 12 bits of PREFIX encode the length of the metadata (0 to e, f00 to fff)

The length of the metadata in bits is 4*(n+1) where n is the value that is encoded.

The format of the metadata itself remains to be defined.

The most compact way to use it is probably to allocate version numbers.

Examples:
* 00 to 0f : length = 4 bits. 16 possible version numbers
* 100 to 1ff : length = 8 bits. 256 possible version numbers. (00 is used for Electrum's wallet structure)
* 2000 to 2fff
*etc.

Talk:BIP 0039 - Revision history

ThomasV: adding my signature

ThomasV: Created page with "Here is a simple implementation of my proposal to 'mine' for a seed:
from electrum import mnemonic import ecdsa import time import hmac import hashlib PREFIX = "100" ..."