nlocktime

BitcoinJ open-source release and protocol questions

Satoshi gives his most detailed explanation of Bitcoin contracts, sequence numbers, nLockTime, and high-frequency trading channels. He explains why merkle branch verification alone cannot prevent double-spends.

Using Bitcoin as collateral for abuse prevention

Satoshi explains why stateful script opcodes would enable chain-forking attacks, then presents a detailed step-by-step multisig contract pattern using nLockTime for safe time-locked deposits without trust.