{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://opensea.io/schemas/Eip3009Fields",
  "title": "Eip3009Fields",
  "type": "object",
  "properties": {
    "caller_address": {
      "type": "string"
    },
    "signature": {
      "type": "string"
    },
    "chain_id": {
      "type": "integer",
      "format": "int64"
    },
    "from": {
      "type": "string"
    },
    "to": {
      "type": "string"
    },
    "value": {
      "type": "integer"
    },
    "valid_after": {
      "type": "integer"
    },
    "valid_before": {
      "type": "integer"
    },
    "nonce": {
      "type": "string"
    }
  }
}