Document

Document Submission

Documents are sent to the platform by submitting the them in a document batch state transition consisting of:

Field	Type	Description
protocolVersion	integer	The platform protocol version (currently 1)
type	integer	State transition type (1 for document batch)
ownerId	array	Identity submitting the document(s) (32 bytes)
transitions	array of transition objects	Document create, replace, or delete transitions (up to 10 objects)
signaturePublicKeyId	number	The id of the identity public key that signed the state transition
signature	array	Signature of state transition data (65 or 96 bytes)

Each document batch state transition must comply with this JSON-Schema definition established in rs-dpp:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "protocolVersion": {
      "type": "integer",
      "$comment": "Maximum is the latest protocol version"
    },
    "type": {
      "type": "integer",
      "const": 1
    },
    "ownerId": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32,
      "contentMediaType": "application/x.dash.dpp.identifier"
    },
    "transitions": {
      "type": "array",
      "items": {
        "type": "object"
      },
      "minItems": 1,
      "maxItems": 10
    },
    "signaturePublicKeyId": {
      "type": "integer",
      "minimum": 0
    },
    "signature": {
      "type": "array",
      "byteArray": true,
      "minItems": 65,
      "maxItems": 96
    }
  },
  "additionalProperties": false,
  "required": [
    "protocolVersion",
    "type",
    "ownerId",
    "transitions",
    "signaturePublicKeyId",
    "signature"
  ]
}

Document Base Transition

All document transitions in a document batch state transition are built on the base schema and include the following fields:

Field	Type	Description
$id	array	The document ID (32 bytes)
$type	string	Name of a document type found in the data contract associated with the dataContractId (1-64 characters)
$action	array of integers	Action the platform should take for the associated document
$dataContractId	array	Data contract ID generated from the data contract’s ownerId and entropy (32 bytes)

Each document transition must comply with the document transition base schema:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "$id": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32,
      "contentMediaType": "application/x.dash.dpp.identifier"
    },
    "$type": {
      "type": "string"
    },
    "$action": {
      "type": "integer",
      "enum": [0, 1, 3]
    },
    "$dataContractId": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32,
      "contentMediaType": "application/x.dash.dpp.identifier"
    }
  },
  "required": [
    "$id",
    "$type",
    "$action",
    "$dataContractId"
  ],
  "additionalProperties": false
}

Document id

The document $id is created by hashing the document’s dataContractId, ownerId, type, and entropy as shown in rs-dpp.

// From the Rust reference implementation (rs-dpp)
// generate_document_id.rs
pub fn generate_document_id(
    contract_id: &Identifier,
    owner_id: &Identifier,
    document_type: &str,
    entropy: &[u8],
) -> Identifier {
    let mut buf: Vec<u8> = vec![];

    buf.extend_from_slice(&contract_id.to_buffer());
    buf.extend_from_slice(&owner_id.to_buffer());
    buf.extend_from_slice(document_type.as_bytes());
    buf.extend_from_slice(entropy);

    Identifier::from_bytes(&hash(&buf)).unwrap()
}

Document Transition Action

Action	Name	Description
0	Create	Create a new document with the provided data
1	Replace	Replace an existing document with the provided data
2	RESERVED	Unused action
3	Delete	Delete the referenced document

Document Create Transition

The document create transition extends the base schema to include the following additional fields:

Field	Type	Description
$entropy	array	Entropy used in creating the document ID. Generated as shown here. (32 bytes)
$createdAt	integer	(Optional)
$updatedAt	integer	(Optional)

Each document create transition must comply with this JSON-Schema definition established in rs-dpp (in addition to the document transition base schema) that is required for all document transitions):

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "$entropy": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32
    },
    "$createdAt": {
      "type": "integer",
      "minimum": 0
    },
    "$updatedAt": {
      "type": "integer",
      "minimum": 0
    }
  },
  "required": [
    "$entropy"
  ],
  "additionalProperties": false
}

Note: The document create transition must also include all required properties of the document as defined in the data contract.

The following example document create transition and subsequent table demonstrate how the document transition base, document create transition, and data contract document definitions are assembled into a complete transition for inclusion in a state transition:

{
  "$action": 0,
  "$dataContractId": "5wpZAEWndYcTeuwZpkmSa8s49cHXU5q2DhdibesxFSu8",
  "$id": "6oCKUeLVgjr7VZCyn1LdGbrepqKLmoabaff5WQqyTKYP",
  "$type": "note",
  "$entropy": "yfo6LnZfJ5koT2YUwtd8PdJa8SXzfQMVDz",
  "message": "Tutorial Test @ Mon, 27 Apr 2020 20:23:35 GMT"
}

Field	Required By
$action	Document base transition
$dataContractId	Document base transition
$id	Document base transition
$type	Document base transition
$entropy	Document create transition
message	Data Contract (the message document defined in the referenced data contract -5wpZAEWndYcTeuwZpkmSa8s49cHXU5q2DhdibesxFSu8)

Document Replace Transition

The document replace transition extends the base schema to include the following additional fields:

Field	Type	Description
$revision	integer	Document revision (=> 1)
$updatedAt	integer	(Optional)

Each document replace transition must comply with this JSON-Schema definition established in rs-dpp (in addition to the document transition base schema) that is required for all document transitions):

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "$revision": {
      "type": "integer",
      "minimum": 1
    },
    "$updatedAt": {
      "type": "integer",
      "minimum": 0
    }
  },
  "required": [
    "$revision"
  ],
  "additionalProperties": false
}

Note: The document create transition must also include all required properties of the document as defined in the data contract.

The following example document create transition and subsequent table demonstrate how the document transition base, document create transition, and data contract document definitions are assembled into a complete transition for inclusion in a state transition:

{
  "$action": 1,
  "$dataContractId": "5wpZAEWndYcTeuwZpkmSa8s49cHXU5q2DhdibesxFSu8",
  "$id": "6oCKUeLVgjr7VZCyn1LdGbrepqKLmoabaff5WQqyTKYP",
  "$type": "note",
  "$revision": 1,
  "message": "Tutorial Test @ Mon, 27 Apr 2020 20:23:35 GMT"
}

Field	Required By
$action	Document base transition
$dataContractId	Document base transition
$id	Document base transition
$type	Document base transition
$revision	Document revision
message	Data Contract (the message document defined in the referenced data contract -5wpZAEWndYcTeuwZpkmSa8s49cHXU5q2DhdibesxFSu8)

Document Delete Transition

The document delete transition only requires the fields found in the base document transition.

Example Document Batch State Transition

{
  "protocolVersion": 1,
  "type": 1,
  "signature": "ICu/H7MoqxNUzznP9P2aTVEo91VVy0T8M3QWCH/7dg2UVokG98TbD4DQB4E8SD4GzHoRrBMycJ75SbT2AaF9hFc=",
  "signaturePublicKeyId": 0,
  "ownerId": "4ZJsE1Yg8AosmC4hAeo3GJgso4N9pCoa6eCTDeXsvdhn",
  "transitions": [
    {
      "$id": "8jm8iHsYE6ENENvFVeFVFMCwfgEqo5P1iR2q4KAYgpbS",
      "$type": "note",
      "$action": 1,
      "$dataContractId": "AnmBaYH13RyiuvBkBD6qkdc36H5DKt6ToMrkqgUnnywz",
      "message": "Updated document @ Mon, 26 Oct 2020 14:58:31 GMT",
      "$revision": 2
    }
  ]
}

Document Object

The document object represents the data provided by the platform in response to a query. Responses consist of an array of these objects containing the following fields as defined in the Rust reference client (rs-dpp):

Property	Type	Required	Description
protocolVersion	integer	Yes	The platform protocol version (currently 1)
$id	array	Yes	The document ID (32 bytes)
$type	string	Yes	Document type defined in the referenced contract (1-64 characters)
$revision	integer	No	Document revision (=>1)
$dataContractId	array	Yes	Data contract ID generated from the data contract’s ownerId and entropy (32 bytes)
$ownerId	array	Yes	Identity of the user submitting the document (32 bytes)
$createdAt	integer	(Optional)	Time (in milliseconds) the document was created
$updatedAt	integer	(Optional)	Time (in milliseconds) the document was last updated

Each document object must comply with this JSON-Schema definition established in rs-dpp:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "$protocolVersion": {
      "type": "integer",
      "$comment": "Maximum is the latest protocol version"
    },
    "$id": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32,
      "contentMediaType": "application/x.dash.dpp.identifier"
    },
    "$type": {
      "type": "string"
    },
    "$revision": {
      "type": "integer",
      "minimum": 1
    },
    "$dataContractId": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32,
      "contentMediaType": "application/x.dash.dpp.identifier"
    },
    "$ownerId": {
      "type": "array",
      "byteArray": true,
      "minItems": 32,
      "maxItems": 32,
      "contentMediaType": "application/x.dash.dpp.identifier"
    },
    "$createdAt": {
      "type": "integer",
      "minimum": 0
    },
    "$updatedAt": {
      "type": "integer",
      "minimum": 0
    }
  },
  "required": [
    "$protocolVersion",
    "$id",
    "$type",
    "$revision",
    "$dataContractId",
    "$ownerId"
  ],
  "additionalProperties": false
}

Example Document Object

{
  "$protocolVersion": 1,
  "$id": "4mWnFcDDzCpeLExJqE8v7pfN4EERC8NE2xn4hw3VKriU",
  "$type": "note",
  "$dataContractId": "63au7XVDt8aHtPrsYKoHx2bnRTSenwH62pDN1BQ5n5m9",
  "$ownerId": "7TkaE5uhG3T9AhyEkAvYCqZvRH4pyBibhjuSYPReNfME",
  "$revision": 1,
  "message": "Tutorial Test @ Mon, 26 Oct 2020 15:54:35 GMT",
  "$createdAt": 1603727675072,
  "$updatedAt": 1603727675072
}