{
  "manageEntity": {
    "action": "Save",
    "entityId": "123219758",
    "entityType": "Track",
    "nonce": "0xba329b86a0fc63c757b3261baf7ee619c0e2163168d2167edae88654b9e74886",
    "signature": "0xdce6e7a4cc17c693671b12b8a23282fcb421397a6dddd6e4ffda7daf66ca40d64f3a9ee5afd714c4c6369c688bc278024f150352584b0e59d433412e71d43ea11c",
    "signer": "0xfB6436C438F897b7eA739876B4Cfcca832868820",
    "userId": "512354652"
  }
}