escrow

Lack of chargeback support

Satoshi explains that Bitcoin is designed for non-reversible transactions between two parties without intermediaries, and describes planned escrow transactions using a predicate language.

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.