{
  "manageEntity": {
    "action": "Save",
    "entityId": "2141313083",
    "entityType": "Track",
    "nonce": "1789895388315803103",
    "signature": "0x39d02466f5a96a814ec1820bb2c34f3ddc1e8cfde264590a2e2f67f323e9690b5081094c06d432fac562062b7d12543e69fb7964b77d19c1382d272078fe66351b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}