Partially Signed Bitcoin Transaction
PSBT (Partially Signed Bitcoin Transaction) is a standardized data format used in Bitcoin to facilitate multi-party transaction signing without exposing private keys. It allows multiple participants (e.g., hardware wallets, software wallets, or co-signers) to collaboratively create, sign, and finalize a transaction in a secure, offline-capable manner. This format is essential for complex setups like multisignature wallets, coinjoins, and hardware wallet integrations.
Developers should learn PSBT when building Bitcoin applications that require secure multi-party transaction signing, such as wallet software, exchange platforms, or custody solutions. It is particularly useful for implementing hardware wallet support, enabling offline signing to protect private keys, and facilitating collaborative transactions in multisig or Lightning Network contexts. PSBT ensures interoperability between different wallet implementations and enhances security by keeping keys isolated during the signing process.