{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x003b76475fd9061ad0ce981d5111fa69fb1a25d96dad789429b455c5f6fd36dd",
    "signature": "0x6d8cffcadf7f379995b6e120ef9f7f899af6a37008e2027e69c15999cfa5346f524e288c0546e88ce4a9a17c1353e9689601c44e9cb32db3d14d38bd388f12d71b",
    "signer": "0x4F66b0Cc2B7bA1e7851669BEa8D0cA1FbE6ae977",
    "userId": "866894265"
  }
}