{
  "manageEntity": {
    "action": "Save",
    "entityId": "272388",
    "entityType": "Track",
    "nonce": "0x3b48b8f0e0aaec78dde5f3fc8f4c79ea713d9bdde463c81b4d45ec2ad616b2ca",
    "signature": "0xea9a2236100e7994e9f5cf16622cfdfc04bfd8ac66f8ac259c6fa42d5d9bf8511bfcf70e1c655bcbafbe97a05dff48ac7a6415a6c597b3f647e9ca57e5d0aa8d1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}