{
  "manageEntity": {
    "action": "Save",
    "entityId": "1420329488",
    "entityType": "Track",
    "nonce": "0x2c1787f40a4f134e445d47d14106c615143d4c5b457304c9ab63b2fa9ffac1c5",
    "signature": "0x54833bdcc2bcc11a2dc7985b5d24f10ceb97bf2fe0d526861e7dc64c0b42f26f29123d6d69ef4411e2b8be296032dccbcfea3e81c3b086ffd2b64015f9199c301c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}