{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x99f814b1b04754fafdcbb9fb206b2c09b837109d850be917e5fc27c1c2c7681e",
    "signature": "0x36bdefc4ba5be880ab3cf92956dc067f40628b5aa302213744ccb4a730962c300699366081ad330f383cec0236bd6fbd976e657c8e7af84d5e6d9cf21d2a61961c",
    "signer": "0x69F642f1FbaFC3710E919da223b90DC0D5eD7a1e",
    "userId": "748581512"
  }
}