{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x338b8a3d49103c6f113e9b0d5044998d1fbdc7e6688256f68828e09049318210",
    "signature": "0x773fe77e8e0d64d6138a4ddc0e4d7aad57a5653e058b4b2be45de3fc7773306e14b3799f7f5efe2c97e1fe20c69cb82018c7495b86327514ac02cc5bc77c048f1c",
    "signer": "0x7791845b665b142C24Fb9Ae33898C02C633391e8",
    "userId": "741017349"
  }
}