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Crockford base32 with letter-case checksums similar to ETH addresses.

1. Take crockford base32 of value (e.g. base32.js
2. Take hash of value (keccak256)
3. Uppercase Nth letter of encoded string if bit 0 of byte N of hash is 1

Checksum density:

• (22/32) check bits per char
• 5 value bits per char
• = 0.1375 check bits per bit = 1.1 check bits per byte
• encoding density is (5/8) so this gives 0.6875 check bits per encoded bytes
• !! up to a maximum of 32 check bits, b/c it only uses LSB of each byte in hash (32 bytes) for simplicity