A partially signed bitcoin transaction.
Build a new Partially Signed Bitcoin Transaction.
Combines this PartiallySignedTransaction with another PSBT as described by BIP 174. In accordance with BIP 174 this function is commutative i.e.,
A.combine(B) == B.combine(A)
Serialize the PSBT data structure as a String of JSON.
Return the PSBT in string format, using a base64 encoding.
Get the txid of the PSBT.