Data

Data transaction sets data entries in sender's account data storage.

JSON

{
  "type": 12,
  "version": 3,
  "id": "8M6dgn85eh3bsHrVhWng8FNaHBcHEJD4MPZ5ZzCciyon",
  "sender": "3Jq8mnhRquuXCiFUwTLZFVSzmQt3Fu6F7HQ",
  "senderKeyType": "ed25519",
  "senderPublicKey": "AJVNfYjTvDD2GWKPejHbKPLxdvwXjAnhJzo6KCv17nne",
  "fee": 14000000,
  "timestamp": 1610397549043,
  "data": [
    {
      "type": "boolean",
      "value": true,
      "key": "bool"
    },
    {
      "type": "binary",
      "value": "base64:SGVsbG8gV2F2ZXM=",
      "key": "bin"
    },
    {
      "type": "integer",
      "value": 1234567,
      "key": "int"
    },
    {
      "type": "string",
      "value": "some text",
      "key": "str"
    }
  ],
  "proofs": [
    "4aMwABCZwtXrGGKmBdHdR5VVFqG51v5dPoyfDVZ7jfgD3jqc851ME5QkToQdfSRTqQmvnB9YT4tCBPcMzi59fZye"
  ],
  "height": 1069662
}

• id and height should be omitted when broadcasting. These fields are set by the node.

• Binary strings are base58 encoded.

• timestamp is in microseconds since epoch.

• fee includes 8 digits, so LTO * 10^8

Data entries

Data entries are one of 4 types: "boolean", "integer", "string", and "binary". A data transaction can have a maximum of 100 data entries.

In JSON, the value of a binary data entry must be base64 encoded and prefixed with "base64:". The value of the integer type is a signed long (8 bytes).

Fees

The fees of a data transaction are determined by the size of the data entries. The base fee is 1 LTO, with an additional fee of 0.1 LTO per 256 bytes.

Binary schema

The binary data structure of the unsigned transaction.

V3 (current)

#	Field Name	Type	Length
1	Transaction type	Byte (constant, value=12)	1
2	Version	Byte (constant, value=3)	1
3	Network id	Byte	1
4	Timestamp	Long	8
5	Sender's key type	KeyType (Byte)	1
6	Sender's public key	PublicKey (Array[Byte])	32 | 33
7	Fee	Long	8
8	Number of entries	Short	2
9	Entry 1
...

• Anchor length and Anchor can be repeated for each anchor hash.

• Network id can be obtained by taking the 2nd byte from the sender address.

• Each key type has a numeric id in addition to the reference from the JSON.
• Integers (short, int, long) have a big endian byte order.

Binary schema of data entries

The encoding of a data entry depends on the type.

Integer

Type	Byte (constant, value=0)	1
Value	Long	8

Boolean

Type	Byte (constant, value=1)	1
Value	Byte	1

Binary

Type	Byte (constant, value=2)	1
Length (N)	Short	2
Value	Array[Byte]	N

String

Type	Byte (constant, value=3)	1
Length (N)	Short	2
Value	String (UTF-8)	N