{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8c58dde5e77d4d862415c011d9d4538ce772a86eaa5342fe0dfcc2807ed7ed13",
    "signature": "0x73e665d01d7dc3ef43ed8fc1a1ec9536f002e7b8bc2b7c6f7bbad030fddda5c24551539c4d49d241f77c590d17d92fffce6ef7f897b8a1f081b0717e13794d0f1c",
    "signer": "0x693cD238440C3be2717f3D9C30FC0E77DDCE0C18",
    "userId": "651204786"
  }
}