Wichteln App with openid login
Visit wichteln.nft-login.net.
First you need an nft. You can get them for free on the market. When you own an nft, visit wichteln.nft-login.net and login. You will be redirected to nft-login.net, where you have to sign a message with your address you buyed the nft with. When you are logged in, you can see a list of tokens you own. You can now upload a christmas card. When you click on the present, the card will be opened.
Anyone on the market can buy the nft token and the owner can login and view the christmas card.