{
  "manageEntity": {
    "action": "Save",
    "entityId": "902027965",
    "entityType": "Track",
    "nonce": "0x885e6535287e04c88749013a3f72919403e9c7d6884acbb3e07b9add3e09cbf8",
    "signature": "0x89e4f2d6dd64cd0129a3eddb55856da7398e5e05119a72fb8e1e6159cab4f8dd535a8f43761887d51b5fcc9ed78f06639694d028a391729dca9311e1b992e7e41c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}