{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638748969",
    "entityType": "Track",
    "nonce": "0x035a158a56eda9823527fc8cbb37c2b597548eb94a1e43fec1921e9f66623e62",
    "signature": "0xe5887fa5582d85cbbb73b0518b7ce0afb19100ca0c19f8ff0fc60c0656f7779a4c1ab8ed56b1a8cb4a77c82aca58aba2626c463028934aadeeb60bc3bbfe917f1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}