Public Key Announcement
A Public Key Announcement is a way to note a new cryptographic key that can be used in DSNP to secure and verify the authenticity of communications.
The most recently published key (if one exists) for a given key type should be treated as the active key of that key type.
|Field||Description||Data Type||Serialization||Parquet Type||Bloom Filter|
|announcementType||Announcement Type Enum (||enum||decimal||no|
|fromId||id of the user creating the Announcement||64 bit unsigned integer||decimal||YES|
|keyType||Key Type Enum||enum||decimal||YES|
|keyId||user-assigned identifier||64 bit unsigned integer||decimal||no|
|publicKey||public key in multikey format||variable length byte array||UTF-8||no|
- MUST be fixed to
- MUST be a DSNP User Id
- MUST be an allowed Key Type value
Allowed Key Types
|Value||Name||Allowed Algorithms (multicodec)||Purpose|
|1||A Curve25519 public key that can be used in key exchange protocols to generate a shared secret|
- A user-assigned 64-bit identifier for the key.
The user may assign a new
keyId each time they announce a new key of a given
keyId value is useful when invoking certain DSNP Operations in order to indicate which key was used to encrypt data.
It may also provide a hint to the user if they ever need to regenerate their private key (for example, many key derivation functions enable the use of a subkey identifier to deterministically create a subkey from a root key).
- MUST be a public key of an allowed algorithm for
keyType, encoded in
multikey encoding of public keys is described in the draft did:key Method specification.
The byte encoding consists of a multicodec key identifier (as a varint) followed by the public key's binary data in the codec's described format.
If serializing the
multicodec value as a string,
base58btc encoding is recommended.
For example, the string
z6LStiZsmxiK4odS4Sb6JmdRFuJ6e1SYP157gtiCyJKfrYha decodes as a Base58 string using the
x25519-pub multicodec value with a 32-byte raw key of