A unique identifier for the resource.
The resource id MUST be calculated from event chain id. The
id is a base58 encoded value from the following data structure:
Event chain id
Public key hash
Public key hash is first 20 bytes of SecureHash of public key bytes. Checksum is first 4 bytes of SecureHash of version, random and hash bytes. SecureHash is hash function
sha256(Blake2b(data)). The random number can be random number or generated from a nonce. This nonce might be the first 20 bytes of a
sha256 hash of a string.