You expect a bookmark to be a safe copy

Why saving feels like checking

The act of bookmarking has a small ceremony to it. You decided this one was good, you took a step to keep it, and the result sits in your own browser rather than on somebody else's page. All of that feels like custody. What actually happened is a copy operation, and a copy carries no information about whether the original was correct.

The feeling gets stronger over time, which is the wrong direction. Six months in you no longer remember which page you took it from or what state you were in that evening. The bookmark has become its own authority by outliving its source.

The two ways it goes wrong

It was wrong when you saved it

This is the bad one. If the page you copied from was carrying a substituted address, your bookmark is now a permanent, private, personally trusted copy of the attacker's address. Every later visit reinforces it. You will defend it in an argument, because you saved it yourself, and self-collected evidence is the hardest kind to doubt.

It was right and then aged

This is the ordinary one. The address stops answering because the set rotated, which happens for reasons that have nothing to do with you. Annoying rather than dangerous, except for what it makes you do next. You go hunting in a hurry, and hurry is where the first failure mode gets its supply.

How to store links so they keep their meaning

• Save the whole set, not one address. Three saved together let you tell rotation apart from a dead site immediately.
• Save where the set came from in the same place. A bookmark with no provenance is a claim with no author.
• Write the date you saved it. Not to display anywhere, just so future you knows how old the copy is.
• Keep the source, not only the destination. When the set ages out, the source is what you return to, and returning to a known page beats searching from scratch.
• Do not sync this to an account that identifies you. A bookmark bar is a list of things you cared about, stored under your name.

The one thing that upgrades a bookmark

If the set you saved was signed and you checked the signature at the time, the saved copy is worth much more. You are no longer trusting a page you half remember. You are trusting a key. That is the only version of this where storage and verification meet.

Without that, a bookmark is a convenience with an unknown error rate and a silent expiry date. Useful, not authoritative, and worth re-checking against a source you can still name.

Related: a wrong character would be obvious and the address will keep working.