[jrrrr]

Perfect, thanks, that's what I was looking for (and none of the news coverage seems to mention).

So when you want to sell a tweet, Valuables verifies who you are and that you own the account (presumably), they produce one certificate and promise never to produce another, and then it goes into the blockchain.

So now there is one and only one entry for this tweet in the Valuables Twitter namespace, but there can be more from other organizations and on other blockchains.

It's going to become even more of a collectors' item when Valuables shuts down, or Twitter changes their URL scheme, or we're not using https:// anymore ;)