{
  "manageEntity": {
    "action": "Update",
    "entityId": "1144147919",
    "entityType": "Track",
    "metadata": "{\"cid\":\"\",\"data\":{\"cover_art_sizes\":\"baeaaaiqsecprnsyx3qqf56hhwjyny3hgh6lgiihmvuabpugjryrhpupdreitq\"}}",
    "nonce": "1777431861114377357",
    "signature": "0x09fb196d221756b3499588788c3d4a3079d69de0d8872b1c0b73aac2a6abd355511b5cd889e68724444caf1ed9749d7b66ba44d088788de2a6e28aabe32bb03b1b",
    "signer": "0x3f0D2D42FA7eece2896546a75f5773D0B8DBF44A",
    "userId": "9859"
  }
}