feat: Complete PSBT Implementation with BIP-371 Taproot Support, Testnet4 Examples, and Comprehensive Tests#172
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…mprehensive tests BIP-371 Serialization: - Add all BIP-371 Taproot fields to PSBTInput/PSBTOutput (tap_key_sig, tap_script_sigs, tap_leaf_scripts, tap_bip32_derivation, tap_internal_key, tap_merkle_root, tap_tree) - Add parsing and serialization for all BIP-371 key types (0x13-0x18 inputs, 0x05-0x07 outputs) - Strict validation: reject invalid tap_key_sig/tap_script_sig lengths, invalid control block sizes, and invalid tap_internal_key lengths Taproot Key-Path Signing: - Add P2TR branch to sign_input() using Schnorr signatures and get_transaction_taproot_digest() - Map SIGHASH_ALL(1) to SIGHASH_DEFAULT(0) for Taproot - Update _finalize_p2tr() to use tap_key_sig and clear BIP-371 fields - Update _finalize_input() to handle P2TR before checking partial_sigs Tests: - test_psbt_taproot.py: 27 tests covering lifecycle, sighash types, BIP-371 field round-trips, combine, finalize, mixed types, validation - test_psbt_bip371_vectors.py: 17 official BIP-371 test vectors from the specification (valid round-trips + invalid rejection) Educational Examples: - examples/psbt/psbt_p2wpkh_testnet4.py: P2WPKH PSBT lifecycle - examples/psbt/psbt_multisig_testnet4.py: 2-of-3 multisig PSBT - examples/psbt/psbt_p2tr_testnet4.py: Taproot key-path PSBT - examples/psbt/psbt_p2tr_hd_testnet4.py: HD wallet Taproot PSBT - examples/psbt/README.md: Workflow diagrams, compatibility matrix - examples/verify_testnet4.py: Live testnet4 verification script
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Resolved conflicts in bitcoinutils/script.py, bitcoinutils/transactions.py, and bitcoinutils/psbt.py by integrating BIP-371 Taproot features into the master PSBT implementation.
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Summary
This PR extends the existing PSBT implementation with BIP-371 Taproot key-path signing support, Testnet4 educational examples, and a comprehensive test suite including official BIP-371 test vectors.
BIP-371 Serialization & Validation
PSBTInputandPSBTOutput(tap_key_sig,tap_script_sigs,tap_leaf_scripts,tap_bip32_derivation,tap_internal_key,tap_merkle_root,tap_tree)0x13–0x18for inputs,0x05–0x07for outputs)Taproot Key-Path Signing
sign_input()using Schnorr signatures viasign_taproot_input()SIGHASH_ALL→SIGHASH_DEFAULTmapping for Taproot_finalize_p2tr()to usetap_key_sigand clear intermediate BIP-371 fieldsTest Suite
test_psbt_taproot.py: 27 tests covering full lifecycle, sighash types, BIP-371 field round-trips, combine, finalize, mixed input types, and validationtest_psbt_bip371_vectors.py: 17 official BIP-371 test vectors from the specification (valid round-trips + invalid rejection)Educational Testnet4 Examples
examples/psbt/psbt_p2wpkh_testnet4.pyexamples/psbt/psbt_multisig_testnet4.pyexamples/psbt/psbt_p2tr_testnet4.pyexamples/psbt/psbt_p2tr_hd_testnet4.pyexamples/psbt/README.mdexamples/verify_testnet4.pyCompatibility Matrix
Explicitly Out of Scope
BIP-370, script-path spending, MuSig2, hardware wallets, descriptor wallets.