PSBT (Partially Signed Bitcoin Transactions)

This directory contains documentation for PSBT implementation and usage in the go-crypto-wallet system.

Contents

Document	Description	Audience
user-guide.md	How to use PSBT for offline signing workflows	Operators
developer-guide.md	Technical implementation details for developers	Developers
implementation.md	PSBT implementation architecture	Developers
migration.md	Migration guide from legacy to PSBT	All
poc-example.md	Proof of concept examples	Developers

What is PSBT?

PSBT (BIP174) is the standard format for Bitcoin transactions that require offline or multi-party signing. It enables:

• Offline Signing: Sign transactions on air-gapped devices
• Multi-party Signing: Coordinate signatures from multiple parties
• Hardware Wallet Support: Compatible with hardware security modules

PSBT Workflow

1. Creator (Watch Wallet) → Create unsigned PSBT
2. Updater → Add metadata (optional)
3. Signer(s) (Keygen/Sign Wallet) → Add signatures
4. Combiner → Combine PSBTs (optional)
5. Finalizer → Create final transaction
6. Extractor → Extract broadcastable transaction

Related Documentation

• ../operations/wallet-flow.md - Transaction flow using PSBT
• ../musig2/ - MuSig2 uses PSBT for coordination
• ../README.md - Main BTC documentation index

References

• BIP174 - PSBT
• BIP370 - PSBT Version 2
• BIP371 - Taproot PSBT Fields