{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x7b92e6fb42b49b5ec404c1b28bb8eba64f4c718e76bbd93c357fe7061ba90f28",
    "signature": "0x044c2d251b9ab6dac9ad090bdb2582b1df4d882fd2b79ef47cf55683220e42cb406756cdfff3aa2d702bb960aa34918a5e8e572c9234456e469ba9fdc5e534201c",
    "signer": "0x08841C70270Da423963e1F5Ed5F457A3Ead06D53",
    "userId": "355266761"
  }
}