{
  "manageEntity": {
    "action": "Save",
    "entityId": "16817388",
    "entityType": "Track",
    "nonce": "0xb849848af586308e777de2b266296d468283810382ed317747bd944ee5f89953",
    "signature": "0x45c8071b4103af99eb20abc69c539971288c1de74d7a92f7ab7b9b61def45d2f64dd454a7479261afe6f29fe4434e21be26328a402748181c3812724cfb1bb191c",
    "signer": "0xBA42fD5f771F5230C848Ca0A3371d1FBafC4D54C",
    "userId": "257375906"
  }
}