{
  "manageEntity": {
    "action": "Save",
    "entityId": "497482207",
    "entityType": "Track",
    "nonce": "0x62bc757df6f25dee4c15c23ca759f0ac4b3b479e97b4fc560b4aaf157ef632e1",
    "signature": "0x911ae801fff1e264aa0eaaa3091c07d688c74394af846a0fd266394f717fe23830b6f10d70a8c5a98b0f829e21e1ad11f2494add29a5fe6cc2e694b30bba3fdd1c",
    "signer": "0xf39D3e3Ea8b52437CD50Aa1EE0BD56d4431FC6CD",
    "userId": "183245"
  }
}