lbry.tech/documents/resources/consensus.md

LBRY Consensus Algorithm

LBRY uses proof of work as a consensus mechanism, the same way that Bitcoin does.

LBRY has differences in hash function, block targeting, and difficult adjustment.

Hash Mechanism

intermediate = sha512(sha256(sha256(data)))  # compute the sha512() of the double-sha256() of the data
left = ripemd(intermediate[:len(intermediate)/2])  # separately ripemd160 the left half
right = ripemd(intermediate[len(intermediate)/2:]) # and the right half
proof = sha256(sha256(left + right))  # concatenate the two halves, and double-sha256() it again

Block Targeting

PR this.

Difficulty Adjustment

PR this.