{
  "manageEntity": {
    "action": "Save",
    "entityId": "1374686962",
    "entityType": "Track",
    "nonce": "0x500a2d9a474e3257c8f4427009449beec6ebd63c74f0fe784da4f35791e270d8",
    "signature": "0xa4e4aab7b56ad329349670f467e1b34bcbada8d515f8abe64521e48aa621d5002d5ec8c1a08f18adc37dc70a0f2e0ac829bc3c56964b7a4c7c512f1c6070c6e21c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}