{
  "manageEntity": {
    "action": "Save",
    "entityId": "672168",
    "entityType": "Track",
    "nonce": "0xb51adfabe87c982fe35df3be98c3dd7dfa2334fed31a5ffa722acb6422420680",
    "signature": "0xafbd764ec4f8544c715f2ec1c2d69f866f63420ce75a25eb70aa8383cc174cee41807b1cfb38ef325f8e94e0649725539387766b7d5e0051064abd91230e377b1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}