{
  "manageEntity": {
    "action": "Save",
    "entityId": "722131",
    "entityType": "Track",
    "nonce": "1788392610423770458",
    "signature": "0xd57530d19b915740dbab5029d218f709442e3bb9b875f556280ac0a4b403e11b316bbdf4dbf11df143ae08504cde2977509b17e6597e6671d7d6467b0504706a1c",
    "signer": "0x23dF8876fD80368D375d911e3CbDFd15B8e85CB5",
    "userId": "827420993"
  }
}