{
  "manageEntity": {
    "action": "Save",
    "entityId": "559540256",
    "entityType": "Track",
    "nonce": "0xd56d736bd8ae4062c65d4f4df95b827fbb87ada0f9f7e959613ac834f24cde64",
    "signature": "0xcfce3d7ef491475f8c01ee513f3ca8bb18d81b27c1a1a7d167e1d760bcbef4aa4f275d960e99cb7c8caec48c7ac3be00d4d9f365ea733c6abf23b7a40f51dd091b",
    "signer": "0x1B58D273a8157400598CDDfaa79118FFbbD0810E",
    "userId": "212717491"
  }
}