{
  "manageEntity": {
    "action": "Save",
    "entityId": "351849190",
    "entityType": "Track",
    "nonce": "0x1fef214dc6a2a3ad38b815693b79d4217ddad6f762046b293108bf613fc6f277",
    "signature": "0x2a94b58035a22678225809af16c52c2a012afdef34156dad02365ee8dfbabed41258c1ee5b90de2c7534f9f25f0ee68c65cf082a1cd64d0460569e71f8dea96f1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}