[DanHulton]

https://ipaidthemost.com/

(Disclaimer: I'm also the author of said site, but it answers the question really well.)

[bluesroo]

You should have a timer for how long the existing payment has been there.

[pketh]

kudos on that great about page too

[DanHulton]

Thanks!

[lorepieri]

This was done on the blockchain back in the days: https://news.ycombinator.com/item?id=16329112 https://etherscan.io/address/0x631c0D6f503C900e969C14d80A61D...