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1. Blockchain - cryptocurrency.

A cryptocurrency coin is one that has its own blockchain.

Examples include Bitcoin, Litecoin, Etherium and Ripple.

Contrasted with tokens, which do not have their own blockchain.

2. Currency - money - small denominations.

Small denominations of physical money, made of low-cost metals or other low-cost material.

3. Currency - collectable - investment.

Investment coins made of precious metals, usually gold.

Some have a nominal face value, but the market price greatly exceeds the face value because of the precious metal content.

Examples include the American Gold Eagle, South African Krugerrand and British Sovereign.

See also