Struct SpPsbtExtractor 

pub struct SpPsbtExtractor { /* private fields */ }

BIP 375 Extractor role: aggregates ECDH shares and computes SP output scripts.

Created via SpPsbtSigner::into_extractor after all required ECDH shares are present. The extract method computes the final SP output scripts and returns the updated PSBT.

Implementations

impl SpPsbtExtractor

pub fn extract( self, _secp: &Secp256k1<impl Verification>, ) -> Result<(Psbt, Vec<ExtractedSpOutput>), PsbtError>

Compute SP output scripts from aggregated ECDH shares.

For each unique scan key in SP output info fields:

1. Aggregates ECDH shares (global share directly, or per-input via combine_keys)
2. The aggregated share IS the BIP 352 shared secret point
3. Derives output pubkeys via compute_output_pubkey(spend_key, shared_secret, k)
4. Builds P2TR scripts from the output pubkeys

Returns the updated PSBT (with computed scriptPubKeys) and extracted output metadata.