{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x765e772643198850086e1e6511746a2112eafa72010d1c61fc0fb9d4a012fb58",
    "signature": "0x3978aab0caae7628810e7f2ced1f857ac31048333fbd9f5e1d90ad02d3d23ee5233cfe9fd15dc5e357244becefd065ab54b3e5dd43979248c42c4fbd4860c91a1b",
    "signer": "0x31DF1a32b4B7f6bDB8c82B2684bDB8beFb00214b",
    "userId": "326346444"
  }
}