Module tx_builder 

Commitment transaction builder

Builds transactions for CSV commitment with:

• UTXO coin selection and Tapret/Opret commitment construction
• Real Taproot tree building with proper nonce positioning
• Fee estimation and dust protection
• Proper handling of plain P2TR (key-path) vs Tapret (script-path) inputs

Structs

ChangeOutput

Change output

CommitmentTxBuilder

Configuration for building commitment transactions

CommitmentTxResult

Transaction builder output

TapretOutput

Tapret commitment output

Enums

CommitmentData

Commitment data output (for backward compatibility)

TxBuilderError

Transaction builder errors