# Address Types

First each blockchain has at least one, and sometimes several, address formats. For example Ethereum addresses consist of 0x followed by 40 hexadecimal digits (0-9,a-f). This format is shared across Ethereum and its forks and other blockchains based on the same Ethereum Virtual Machine (EVM) specification. The private keys, similarly, are shared across all these "flavous" of Ethereum.


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