self.utxos.remove(&input.previous_output);
      }

      for (vout, txout) in tx.output.iter().enumerate() {
        self.utxos.insert(
          OutPoint {
            txid: tx.txid(),
            vout: vout.try_into().unwrap(),
          },
          Amount::from_sat(txout.value),
        );
      }
    }

    self.blocks.insert(block.block_hash(), block.clone());
    self.hashes.push(block.block_hash());
    self.nonce += 1;

    block
  }

  pub(crate) fn pop_block(&mut self) -> BlockHash {
    let blockhash = self.hashes.pop().unwrap();
    self.blocks.remove(&blockhash);

    blockhash
  }

  pub(crate) fn broadcast_tx(&mut self, template: TransactionTemplate) -> Txid {
    let mut total_value = 0;
    let mut input = Vec::new();
    for (height, tx, vout, witness) in template.inputs.iter() {
      let tx = &self.blocks.get(&self.hashes[*height]).unwrap().txdata[*tx];
      total_value += tx.output[*vout].value;
      input.push(TxIn {
        previous_output: OutPoint::new(tx.txid(), *vout as u32),