{
  "manageEntity": {
    "action": "Save",
    "entityId": "622320",
    "entityType": "Track",
    "nonce": "0x90b6bc1635b0ccb6cf29129edb9da6a2c86417670947fe0dc83c15782a2ba58a",
    "signature": "0x9fa091b06b917fed0124e777da7717fd8dece3d598cfc4b8cf6040a59a845bc656c68702518fd6713d211e82f2817ae618f157782ca77acf5b9ca6a5461267991c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}