{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x063dbfa3c645bec6d408f82fd50cad3837b55cbcd012a736d055df038b6ffe3d",
    "signature": "0x45db5abba6256faf5e8e278d17c3d21917592400d1c311beb2ff06a1d7a445fc5831d8a5c9996977457f89a0a308e348bf3db6674e91dda60fe5848e3702d35c1b",
    "signer": "0xe8BAaf9d67869BFe993951C60524b67BC331bac9",
    "userId": "75683930"
  }
}