{
  "manageEntity": {
    "action": "Save",
    "entityId": "450800",
    "entityType": "Track",
    "nonce": "0x4acc235895da6cbc7694131940ffdc82fd9f0a85ec6bd8a1520dc6a6a49afe85",
    "signature": "0x118122ff5f10f87f433c5914afb595edc7aab4cae55b257f62ac5e289b23160d4c14ff5367af0872e6a220ef7ff0e45f3b6f3dc343ffe9fd1157048e7bb97db11b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}