{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x797d6f46c2bd0052ea457419d131d6a1a2fe3b47fbb6f0ac22b2ba09000bfa6b",
    "signature": "0xc01a9e3989e0e102be8c07242eb2874bbcc4f7565b67a919af9cf0e27929a3e5277861fb385f76cacbf505e3a70aea87149490708ee2889c6465400e970aadcf1b",
    "signer": "0x50009A0960C710bc14D25B3365688CCcF334B5cd",
    "userId": "526990907"
  }
}