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Bitcoin used Elliptic Curve Digital Signature Algorithm. (see here). I'm wondering what standard is actually used for this Algorithm: which curve? which prime? Can anybody give me a reference? (Wiki gives this, is this the standard that the ECDSA in Bitcoin?) Anywhere I can find an update on this?

Edit: A bunch of curves are given in page 87 of this. Is bitcoin using one of these?

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I just found the answer from https://en.bitcoin.it/wiki/Protocol_specification#Signatures:

For ECDSA the secp256k1 curve from http://www.secg.org/collateral/sec2_final.pdf is used.

i.e. the curve is

y^2 = x^3 - 7

and the prime

p = 2^256 - 2^32 - 2^9 - 2^8 - 2^7 - 2^6 - 2^4 - 1.

See here for more information.

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