Event

An event on the event chain can be compared to a transaction on a blockchain. An event has the following structure

Field
mediaType	MIME type of the data
data	Binary
previous	The hash of the previous event
timestamp	Unix timestamp in milliseconds. Time of when the event was signed
signKey	Public key with key type
signature	Signature of the binary representation of the event
hash	Hash of the binary representation of the event

JSON

{
  "timestamp": 1519883600,
  "previous": "BRFnaH3UFnABQ1gV1SvT9PLo5ZMFzH7NhqDSgyn1z8wD",
  "signKey": {
    "keyType": "ed25519",
    "publicKey": "2KduZAmAKuXEL463udjCQkVfwJkBQhpciUC4gNiayjSJ"
  },
  "signature": "2hqLhbmh2eX2WhAgbwHhBZqzdpFcjWBYYN5WBj8zcYVKzVbnVH7mESCC9c9acihxWFwfvufnFYxxgFMgJPbpbU4N",
  "hash": "9Y9DhjXHdrsUE93TZzSAYBWZS5TDWWNKKh2mihqRCGXh",
  "mediaType": "application/json",
  "data": "base64:eyJmb28iOiJiYXIiLCJjb2xvciI6ImdyZWVuIn0="
}

• previous, signKey.publicKey, signature, and hash are base58 encoded

• data is base64 encoded, and must be prefixed with base64.

Binary schema

The binary representation is used for signing and hashing the event.

v2

Field	Type	Length
Previous	Hash (Bytes)	32
Key type	KeyType (Byte)	1
Public key	PublicKey (Array[Byte])	32 | 33
Timestamp	Long	8
Media type length (N)	Short	2
Media type	Array[Byte]	N
Data length (M)	Short	2
Data	Array[Byte]	M

v1 (deprecated)

Field	Type	Length
Previous	Hash (Bytes)	32
Key type	KeyType (Byte)	1
Public key	PublicKey (Array[Byte])	32 | 33
Timestamp	Long	8
Media type	Array[Byte]	?
Data	Array[Byte]	?