Update the hash that a public key maps to (doing a cas with the existing value) @param owner The owner of this signing key @param writer The public signing key @param writerSignedBtreeRootHash the signed serialization of the HashCasPair @return True when successfully completed
(PublicKeyHash owner, PublicKeyHash writer, byte[] writerSignedBtreeRootHash)
source not stored for this graph (policy: none)
no outgoing calls