{
  "manageEntity": {
    "action": "Save",
    "entityId": "1640721859",
    "entityType": "Track",
    "nonce": "0x51dfb974117270e56385f9232809e1c4a7a567c8470c00fe6c2716e455645089",
    "signature": "0x5b2e826f9a5b5685d19474de23679cc20ac07afc32f850c6d306a17695fd83fb53b01807683e6a077cd77405e914e0aa4fb0800836e32200f5be5c7e66cfb04f1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}