Does Bitcoin Blockchain solves Byzantine General Problem?
Does Bitcoin Blockchain solves Byzantine General Problem?
If bitcoin blockchain solves byzantine general problem, can you give an example of how it solves it?
Thanks
http://ift.tt/2BVys9uNonce usage in ECDSA signing algorithm
Nonce usage in ECDSA signing algorithm I'm trying to understand the signing function secp256k1_ecdsa_sig_sign(), and I'm curious about the nonce usage here. static int secp256k1_ecdsa_sig_sign(const secp256k1_ecmult_gen_context *ctx, secp256k1_scalar *sigr, secp256k1_scalar *sigs, const secp256k1_scalar *seckey, const secp256k1_scalar *message, const secp256k1_scalar *nonce, int *recid) { unsigned char b[32]; secp256k1_gej rp; secp256k1_ge r; secp256k1_scalar n; int overflow = 0; secp256k1_ecmult_gen(ctx, &rp, nonce); secp256k1_ge_set_gej(&r, &rp); secp256k1_fe_normalize(&r.x); secp256k1_fe_normalize(&r.y); secp256k1_fe_get_b32(b, &r.x); secp256k1_scalar_set_b32(sigr, b, &overflow); /* These two conditions should be checked before calling */ VERIFY_CHECK(!secp256k1_scalar_is_zero(sigr)); VERIFY_CHECK(overflow == 0); if (recid) { /* The overflow condition is cryptographically unreachable as hitting it requires f...
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