{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xf56bd9d15115a5dcc7a4ab3601cd7a44fb4df85cfff82eea81ac63b508351212",
    "signature": "0xaeab842e57817f2522da815dd4de244621d62fcf58520795fddc20427ba530ae265059b81b9e6136da43623d792481437e4fe128ae6f22dc9a7b682767358da71c",
    "signer": "0x21B491C408293772A3Fd7a2276adB84e8558E7dD",
    "userId": "224044552"
  }
}