{
  "manageEntity": {
    "action": "Save",
    "entityId": "402173",
    "entityType": "Track",
    "nonce": "0xdef7b19686506af81fac3c8994c3164927ab1c9f3c32504b5411da1feb9377b3",
    "signature": "0x12b3344dc36cf5cbacdf7f0060c1acd1672fa9be7c31cd60b107ccd0292ce8b441dc1d4195240ec007b1bd24b8a199967972a82951a8a4c7b06df51e2247a2661b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}