TxIn is the part of a transaction that designates where to find the origin of the currency being sent.

Bitcoin uses a record of the sequence of transactions format that makes it possible to verify every transaction in circulation.

The basic structure is composed of multiple inputs that put money in (TxIn) and multiple outputs that take money out (TxOut).

The amount of coin designated by TxIn requires the digital signature of the sender and reflects the sender’s permission to send the amount of Bitcoin designated in the input field.