Base58Check encoding: Difference between revisions

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The popular encoding of small and medium-sized [[:Category:Checksums|checksums]] is [[wp:base16|base16]], that is more compact than usual base10 and is human readable... For checksums resulting in ''hash digests'' bigger than ~100 bits, the base16 is too long: [[wp:base58|base58]] is shorter and (when using good alphabet) preserves secure human readability. The most popular alphabet of base58 is the variant used in bitcoin address (see [[Bitcoin/address validation]]), so it is the "default base58 alphabet".

Write a program that takes a checksum (resultant hash digest) ''integer binary'' representation as argument, and converts (encode it) into base58 with the standard Bitcoin alphabet — which uses an alphabet of the characters 0 .. 9, A ..Z, a .. z, but without the four characters ~~0, O, I and l.~~

Write a program that takes a checksum (resultant hash digest) ''integer binary'' representation as argument, and converts (encode it) into base58 with the standard Bitcoin alphabet — which uses an alphabet of the characters 0 .. 9, A ..Z, a .. z, but without the four characters:

:::*   '''O'''   the uppercase letter "oh",

:::*   '''I'''    the uppercase letter "eye",

:::*   '''l'''    the lowercase letter "ell",   and

:::*   '''0'''   the digit zero.

The ''reference algorithm'' is at [https://en.bitcoin.it/wiki/Base58Check_encoding#Base58_symbol_chart the Bitcoin's Base58Check page].