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There are two completely different encodings getting used for Bitcoin addresses.
Native segwit addresses are encoded utilizing the Bech32(m) encoding. Bech32 makes use of the 32 symbols 023456789acdefghjklmnpqrstuvwxyz to encode knowledge. On mainnet bitcoin native segwit addresses begin with the human readable half bc and the separator 1. The prefix is completely different on check networks.
All prior addresses use Base58. Base58 makes use of the numbers from 1-9 (excluding 0) and all letters of the English alphabet in uppercase and lowercase, excluding capital O, capital I, and lowercase l, as a result of 0 and O, in addition to I and l are straightforward to confuse in lots of fonts. This leaves the 58 symbols: _123456789ABCDEFGH_JKLMN_PQRSTUVWXYZabcdefghijk_mnopqrstuvwxyz. (Omissions are included within the image line-up as underscores in case the letters within the textual content have been onerous to parse out of context of the order.)
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