{
  "manageEntity": {
    "action": "Save",
    "entityId": "1391732842",
    "entityType": "Track",
    "nonce": "0x586e86a4b2ecf88a0509aba931fda4a2a07adacfc5b91e12394e238e03e5a137",
    "signature": "0x50cb2664b55bfe4bd7603f4acb671b8d3a14c1d43e92c47a035c2c5492f2ee3c57411f0b0cc95e85fdad575f1b097c9afc533b019487e9b3b0d3fba49bcfdefa1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}