{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd407bf4bc11fd2b60995ada4d6a977a4be169e3be8910e9a11f83a3a4864cf33",
    "signature": "0x30e4e55dda0a379dcde7a1db971612afd51ea69e2939d96c81ed7f4972ee150611abfa0ad6a541c6e96c770c4ddcebc3095df220a10684f38a186b9aee0f7dda1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}