{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x67eeb7824b7e84c7a446f79748e890ea818f3d8b595d89ee4e52663c99486835",
    "signature": "0x838a7c8208384169182d9f3e68bdc16e8bc9552a1f0de965dfdec1d6be0228b11eae35ffb31d0dcbe6e1eadb521375a14836582fae852fb32fa075dc767930c31c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}