{
  "manageEntity": {
    "action": "Save",
    "entityId": "334715",
    "entityType": "Track",
    "nonce": "0x978966c6dda40b536baf078bffbd00ca60b9a6f7ad5ff1f2f268d32c4699ca38",
    "signature": "0x9b1532924c0a16eb6b616e6a14f4ff0865283e9c16ca093236199f14efb7eb6d38709f375cb6cf2dc0069e02b6cd9019b00b1c6e1f32b8c02b8a58d6a2f3a7aa1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}