{
  "manageEntity": {
    "action": "Save",
    "entityId": "539928",
    "entityType": "Track",
    "nonce": "0x08cf58cfd7e5b1e1c05993a9dc84e154a415fd6dd349a81767e6d54c78fd589f",
    "signature": "0x19994e5285f656754886720435d84e59de7096975be57fa203d431d205ec9fca2b5a266295ad21a7a258dd6cedfe404134f488ae851abaa216a064e08747ab061c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}