{
  "manageEntity": {
    "action": "Save",
    "entityId": "639758",
    "entityType": "Track",
    "nonce": "0x700309c9deb8d6a757836f9268e7d98178b66016ac4eb94e2e7a90e840fb98f0",
    "signature": "0x2074d5deffddb1060fbe7cc3d587e3fc68440b9d5ff392b089b014ad01847e5f16c76617dbab1c808912778f68bfc9b866292ccc4d830ae4436e770da6d012901b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}