{
  "manageEntity": {
    "action": "Save",
    "entityId": "207580",
    "entityType": "Track",
    "nonce": "0x9bde3b65d4c6010a1d82f5d81da7a087a390cac52d049a260e9a7bd4ba13d962",
    "signature": "0x9a450b261578b6b0ae442d25a23152f3c1f410c7d56c6d4656d0fa8a6cb058c5139ea03b77446edb20409883249126331b2587de30fab94ee07ad5540b3fba751b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}