{
  "manageEntity": {
    "action": "Save",
    "entityId": "566860244",
    "entityType": "Track",
    "nonce": "0x4e90fa82e71f37f0cd1d4e0d7c3ac00a1936ed5525b5701c28ee65f8fda24692",
    "signature": "0x2ce3030c11713a732fae3a721c4be7209ab8e87d22fb1227cc53df5b5df3e62b778ff62452f99ead2179b14cd8b855274eae03c7982166d518a5ab8fbbb6e90b1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}