A numerical identifier included in supported blockchain signatures to distinguish the network on which an authorization is intended to work.

When a node switches to a heavier or longer fork and drops recently accepted blocks.

The UTXO sent back to yourself when you spend more than the payment amount.

A fee-bumping trick that spends an unconfirmed output with a high-fee child so miners take both.

The first transaction in a Bitcoin block, which pays the block reward. Not related to the company Coinbase.

A wallet whose keys stay offline, often on a hardware device or paper backup, used for longer-term storage.

In common Bitcoin usage, inclusion in a block gives one confirmation, and each subsequent block on the accepted chain adds another.