psbt.md

PSBT transactions

Requires: #include "PSBT.h"

PSBT - BIP-174

Usage example

HDPrivateKey hd("flight canvas heart purse potato mixed offer tooth maple blue kitten salute almost staff physical remain coral clump midnight rotate innocent shield inch ski", "");
PSBT psbt;

psbt.parseBase64("cHNidP8BAHICAAAAAUswu6MJzSuKPVEDD3cxwoPYynvQOnUP1xIga/Qyv+icAAAAAAD9////AqCGAQAAAAAAF6kUxD/8BOj9UucJiNpagTRzluc4gvKHErsNAAAAAAAWABTZJKDg5Ayidmusul21PNw16zUy2PDlFwAAAQEfQEIPAAAAAAAWABRw5Uq2fGtsTutqAZqDMypDuQmxmSIGA3s6OgE8GCKOcHDJe7XY0q/i/XSe6e933ErCDCCKR5WoGARkI4xUAACAAQAAgAAAAIAAAAAAAAAAAAAAIgID07CelU8+BYAL87tK7Ec0+NfjojPZC/11wjTfcCoTK/4YBGQjjFQAAIABAACAAAAAgAEAAAAAAAAAAA==");
// check parsing is ok
if(!psbt){
  Serial.println("Failed parsing transaction");
  return;
}
Serial.println("Transactions details:");
// going through all outputs
Serial.println("Outputs:");
for(int i=0; i<psbt.tx.outputsNumber; i++){
  // print addresses
  Serial.print(psbt.tx.txOuts[i].address(&Testnet));
  if(psbt.txOutsMeta[i].derivationsLen > 0){ // there is derivation path
    // considering only single key for simplicity
    PSBTDerivation der = psbt.txOutsMeta[i].derivations[0];
    HDPublicKey pub = hd.derive(der.derivation, der.derivationLen).xpub();
    if(pub.address() == psbt.tx.txOuts[i].address()){
      Serial.print(" (change) ");
    }
  }
  Serial.print(" -> ");
  Serial.print(psbt.tx.txOuts[i].btcAmount()*1e3);
  Serial.println(" mBTC");
}
Serial.print("Fee: ");
Serial.print(float(psbt.fee())/100); // Arduino can't print 64-bit ints
Serial.println(" bits");

psbt.sign(hd);
Serial.println(psbt.toBase64()); // now you can combine and finalize PSBTs in Bitcoin Core