{
  "manageEntity": {
    "action": "Save",
    "entityId": "1938277084",
    "entityType": "Track",
    "nonce": "0x526742ec558897eab4a03c57337eff1f9ff7c3bfa74ba1cb86dfc47fe6083123",
    "signature": "0x923fe0ce13772ace7f30039f1691c6c0f1bd4e6afc812e238527d26d4be0fb1d2c0fa160acda4e4b74283877f6c6eed9680cc5354de20c19d9a2bb380a1da0141c",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}