What is Altcoin?
Any cryptocurrency other than Bitcoin.
The term covers everything from long-running networks with genuine engineering to tokens created to be sold. Lumping them together is analytically useless, which is one reason we do not cover them.
Bitcoin Logical is Bitcoin-only by design. That is an editorial scope decision, not a claim that nothing else is interesting.
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This definition is part of the Bitcoin Logical glossary. For the fuller explanation, start with Learn, or see the live numbers on The Bitcoin Signal.