{
  "manageEntity": {
    "action": "Save",
    "entityId": "558973",
    "entityType": "Track",
    "nonce": "0xb0950a34d66e689090c20cb0e19c507f6e418ad028f7c90c2d5ac9872bafdcef",
    "signature": "0x163d8b3b58d7e6e3ca30a142aa5cf116ff269d1202cb01e5e241bff0da8890fd0eab110c8debad8a8b059fb27a7030493c4525a49c6dfebc61fa4c13886bd81e1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}