This kind of PASERK serves as a pointer to another PASERK, which is in
turn intended for public
PASETOs.
This is for serializing public keys in a keypair.
k[version].pid.[data]
See ID for the algorithm.
k1.pid.oxQIZk0yciX7cLRZ3C0Psdoj-RUqmVHrlnIYGNma6xy8
k2.pid.4zgEvkSaB64DlcV9ChYZPEqBATLwUsB5zCrlpEOk2wD9
k3.pid.gnwg7IkzZyQF9wJgLLT0OpbdMT7BYmdQoG2u-xXpeeHz
k4.pid.9ShR3xc8-qVJ_di0tc9nx0IDIqbatdeM2mqLFBJsKRHs