>>12457364 (LB)
Of so called "inputs" and "outputs".
You may think of the blockchain as a giant book, where each participant has an automatically and constantly updated copy of that book. If I send my bitcoin to you, I would create an "output" on a bitcoin address (think safe box) that I control, towards an "input" on a bitcoin address that you control. This transaction is stored on the blockchain and cryptographically verified by all the participants on the bitcoin network.