script: impl OP_HASH256, OP_NIP, OP_PICK, OP_ROLL
script: impl OP_HASH256, OP_NIP, OP_PICK, OP_ROLL

petertodd/dust-b-gone,daedalus/pynode,petertodd/tx-flood-attack,jgarzik/pynode,jgarzik/python-bitcoinlib,petertodd/stealth-addresses-ref-implementation,daedalus/python-bitcoin_r,robertsdotpm/python-bitcoinlib