{
  "manageEntity": {
    "action": "Save",
    "entityId": "815506365",
    "entityType": "Track",
    "nonce": "0xdb54148829480de3b81e5683741059f2c928a92ead643dd15e53c4b7089e9179",
    "signature": "0x171759263bd4c149844faae7ea4f8358d9bf04080f2395fdf9a30181b256f20e12a55b5530faca684e76bf51f4c003e1e2ddb6ccc292f107fde32a237ed0a6881c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}