{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402210290",
    "entityType": "Track",
    "nonce": "0x66782d6cb1fedde0a77a21fd9f46e5788cab0aae737e65c04f72b0094fd92f67",
    "signature": "0x24c49381c15c1460782b37735f7cb87806cd022af6882e1434f21febb815719522d7a5686d765ced8e36370afc20b59458d00c4c688c2417f58e7207f42f41d01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}