contracts

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

Mike Hearn describes his work on Google's abuse team and proposes using Bitcoin as collateral against accounts for spam prevention, asking about time-locking coins.