{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5b72c677b526cbd22641d85122e6803ee2e07a61f22e51df7fdef1e02cfd94d2",
    "signature": "0xd7dab155c8b9e79966a7332e90c68176956287d76e6d408b4cb7c64c82bad5531a19c729fc7b8deb0bd98373417cc7e5960f2d419e1ad79d47d69c84ffe0de9c1c",
    "signer": "0xa53b93A102988fa29b683eB73e428dF91bC78cf9",
    "userId": "87057210"
  }
}