{
  "manageEntity": {
    "action": "Save",
    "entityId": "1704996708",
    "entityType": "Track",
    "nonce": "0x26cfa3a53b063aca540d85047cd26a3942ab100aca39c5465681b8e8bbad39db",
    "signature": "0x0fb9a88a79731253528bca5e97f2bef6eefafac04e337c2c3b11254cfda7bb6920ff6f042d3d9dfeef2c1017331e596e27fed305af4650f7647b0b506c97b57b1c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}