{
  "manageEntity": {
    "action": "Save",
    "entityId": "974696018",
    "entityType": "Track",
    "nonce": "0x0508c68aef7ef3aa91faba9989aedfb188f57c863f5997eca81b1813af58816e",
    "signature": "0x93db718c68513588281095074de0d23359aec81600d169c01756346cfcf5cac264da954bb3a58ffb09999b4abf9a9fba942b91610184a43c3b5296da16acb2d81b",
    "signer": "0xCCdD3363b3A62ef4636d3a4ec208a0a9017E8Eb8",
    "userId": "640720364"
  }
}