{
  "manageEntity": {
    "action": "Save",
    "entityId": "75402",
    "entityType": "Track",
    "nonce": "0x657be617a475468eba0d4f62bc2a73779f70f59b4b344da6233022cb5c06f64d",
    "signature": "0x587168813818fbe884fc58fd506c86334d63706edb8e777c856d1af0a8de79c130534ec0ae2223df003b7ac6acbdb01056fbaa181a29157fa442db37ac6202c61b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}