{
  "manageEntity": {
    "action": "Save",
    "entityId": "643843486",
    "entityType": "Track",
    "nonce": "0xe67e7b316f77e3c4fa07a6ba858b3ed871dc6af40ac5ea62498fbcffdb2d4673",
    "signature": "0xaab65d2b59540df813d4e6b8fb66b64c00232e40a052411917cfa002911acfac68142f16935f7b038d05c04302d7d66152bffcf51ca9d67cffc1d6d75b233ec11b",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}