.SS Addresses
Nano addresses are composed of a prefix (either
.RB \(dq nano_ \(dq
or
.RB \(dq xrb_ \(dq)
and 300 bits of base32 encoded data.  The 300-bits of base32 encoded data
produce a string that is 60 characters long using the base32 alphabet
.BR 13456789abcdefghijkmnopqrstuwxyz .
The format of these 300 bits are
.EX

   struct {
       uint4_t padding = 0000b;
       uint256_t publicKey;