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Coin [Bitcoin]

Definition of a coin: chain of digital signatures.

A bitcoin is a number that is associated with a Bitcoin address.

Creation of coins

The first transaction in a block is special: it starts a new coin which is owned by the creator of the block.

Bitcoins are not fungible.

This is because each Bitcoin has a history and is traceable.

It might happen, for example, that someone (a coin collecter) values a bitcoin that originated in the genesis block higher than any other bitcoin.

There is no such thing as a «bitcoin» per se. There are only unspent transaction outputs which are referred to as coins.