{
  "manageEntity": {
    "action": "Save",
    "entityId": "1234587183",
    "entityType": "Track",
    "nonce": "0x6abbc964b0249589a053a6fc44bc18bae59dbc468f78d03b8b5dd5a17a5bb07f",
    "signature": "0x2796095348ef9a1857d7e68109da3701110df94d012b2e859cbdbe894bcd25915aa0e4dc5964fab22bfbeeaae359d280a99c087e2482820329d3e2bc9d7c82ce1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}