M(data, depth) : Constant-depth binary Merkle tree. GP Appendix E eq (E.4). Pads to 2^depth leaves with zero hashes, then computes binary Merkle root.
M(data, depth) : Constant-depth binary Merkle tree. GP Appendix E eq (E.4). Pads to 2^depth leaves with zero hashes, then computes binary Merkle root.