{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8dca3f2a57df065e0ebea6eefa77b37e8f2459a34ca183bb87fc0871f3629d4b",
    "signature": "0xa29b1b8fc0259f46d95bc71e7e44df83433d45dc1f2ebb4dff4dfaddce5a2ceb1434f9d446a116a45fbc8823a03b222a39d2017309a993a9c6641d302a978b0a1b",
    "signer": "0x615A557E62EFfD4950805ab48294945D82593241",
    "userId": "974110018"
  }
}