def send(from_addr, to_addr, amount):
bc = Blockchain()
utxo_set = UTXOSet(bc)
tx = UTXOTx(from_addr, to_addr, amount, utxo_set)
cb_tx = CoinbaseTx(from_addr)
new_block = bc.MineBlock([cb_tx, tx])
utxo_set.update(new_block)
print('Success!')
