{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "SrMessage",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "id": {
      "type": "integer",
      "description": "Internal TzKT id.  \n**[sortable]**",
      "format": "int64"
    },
    "level": {
      "type": "integer",
      "description": "Level of the block where the message was pushed.  \n**[sortable]**",
      "format": "int32"
    },
    "index": {
      "type": "integer",
      "description": "Index of the inbox message within the block.  ",
      "format": "int32"
    },
    "timestamp": {
      "type": "string",
      "description": "Timestamp of the block where the message was pushed.",
      "format": "date-time"
    },
    "type": {
      "type": "string",
      "description": "Type of the message (`level_start`, `level_info`, `level_end`, `transfer`, `external`, `migration`)."
    },
    "predecessorHash": {
      "type": "string",
      "description": "For `level_info` messages only. Hash of the predecessor block.",
      "nullable": true
    },
    "predecessorTimestamp": {
      "type": "string",
      "description": "For `level_info` messages only. Timestamp of the predecessor block.",
      "format": "date-time",
      "nullable": true
    },
    "initiator": {
      "description": "For `transfer` messages only. Account, initiated the operation.",
      "nullable": true,
      "oneOf": [
        {
          "$ref": "#/components/schemas/Alias"
        }
      ]
    },
    "sender": {
      "description": "For `transfer` messages only. Smart contract, sent the internal transaction.",
      "nullable": true,
      "oneOf": [
        {
          "$ref": "#/components/schemas/Alias"
        }
      ]
    },
    "target": {
      "description": "For `transfer` messages only. Smart rollup to which the internal transaction was sent.",
      "nullable": true,
      "oneOf": [
        {
          "$ref": "#/components/schemas/Alias"
        }
      ]
    },
    "entrypoint": {
      "type": "string",
      "description": "For `transfer` messages only. Entrypoint called in the target rollup",
      "nullable": true
    },
    "parameter": {
      "description": "For `transfer` messages only. Value passed to the called entrypoint. Note: you can configure parameters format by setting `micheline` query parameter.",
      "nullable": true
    },
    "payload": {
      "type": "string",
      "description": "For `external` messages only. Payload bytes (in base64).",
      "format": "byte",
      "nullable": true
    },
    "protocol": {
      "type": "string",
      "description": "For `migration` messages only. Version of the new protocol (e.g. 'nairobi_017').",
      "nullable": true
    }
  }
}