To distinguish between legacy nonces and versioned nonces
we use a specific prefix individual for each version.
Serialized versioned nonce contains:
VERSIONED_MAGIC_PREFIX (4 bytes) || VERSION (1 byte) || NONCE_BYTES (27 bytes)
Currently supported versions:
- V1: SALT (4 bytes) || DEADLINE (8 bytes) || NONCE (15 random bytes)