{
  "manageEntity": {
    "action": "Save",
    "entityId": "1575075896",
    "entityType": "Track",
    "nonce": "0x8ee6afb2646da9e421ae23a1dedb4e54254c2c364740877cf99fddcb7fdbfbec",
    "signature": "0x503947b6b297d7caa1458a6b6784e3a2f9c62a4266653564429b00c65cf571fe160c1e0d9fbd5e731a750cba48cb115ed4d8f181a10c6faae7478346e0280e8c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}