{
  "manageEntity": {
    "action": "Save",
    "entityId": "1805640468",
    "entityType": "Track",
    "nonce": "1792447117653934746",
    "signature": "0x1328597ad31782d4a3971b8e837104d8920f2589de87505d38fe9a59a3fa641b3ec34143adf2086f4df24d89ef590c2e224a85a4613f94ab5db3b98e602e2da21b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}