{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402183589",
    "entityType": "Track",
    "nonce": "0xb25f8ec5f7d5730d864fd2c340cbacc1e797154f89ed342a6b9d86322f977253",
    "signature": "0xb58fb6e90753139266256a500d8333c7135ecb0c736fa612ba0ef5891ce56a5623b8541e56e9e6c62a333996feb3b239eced05b36fde5d2c071d5b4a04fa1b631c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}