Difference between revisions of "Talk:BIP 0039"
(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" ...")
Revision as of 14:56, 26 October 2013
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" 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
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.
- 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