{
  "manageEntity": {
    "action": "Save",
    "entityId": "1515487147",
    "entityType": "Track",
    "nonce": "0xa73dbda7d3ac16fbfb355b04e6014fed051005f6bad674166b98410a57a33aca",
    "signature": "0x58131e3a9550a71f13926276354ef1e0a124bb93cc25ae7ee3958ba5b552c2813bd9b830bda847839f1f8c384f620e9a3d89021e428cf1bf32332229733bbca21b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}