{
  "manageEntity": {
    "action": "Save",
    "entityId": "4938",
    "entityType": "Track",
    "nonce": "0x023bfb1d39b70b6fd808bb0673a82c8b256ea585c2a08c14c2d8cf102018458c",
    "signature": "0xca448ba1b0709d783dbd324987f379a9e6f8251d53f4a0fe9bbd00d4d57a63b0241dd3f334ce0655cd42527752201d5af885d4cce14e28d54d10de6ef47b052f1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}