Reading the address bar properly

What actually happens here

A page is in front of you and you are about to interact with it. Before that, you look at the top of the window and compare what is written there against what you pasted.

That sounds trivial and it is skipped constantly, for a reason worth naming. People check the address before they paste, not after they arrive, and the interesting failures happen in between. A page can send you somewhere else. A copied string can have been the wrong one from the start. A tab you left open twenty minutes ago is not necessarily still the tab you think it is.

Why the address is the strong check

An onion address is not a name assigned by anybody. It is derived from the key held by the service. A service that answers on those exact fifty six characters is the service holding that exact key, and there is no registrar, no lookup and no intermediary that can be persuaded to point the string somewhere else.

That gives you an unusual property. The address is self proving in a way an ordinary domain is not. What it cannot do is tell you the string was the right one when you got it, which is why sourcing is a separate job earlier in the run.

How to compare fifty six characters without going cross eyed

1. Look at the first six characters. In this case they are a real word, which makes the start easy and also makes it the least useful part, because it is the part a lookalike will match.
2. Look at the last ten characters. This is where the work is. A manufactured lookalike is normally generated to match a prefix, because matching a prefix is cheap and matching the tail is not.
3. Check the total shape. The string is a fixed length and ends in a fixed pair of letters before the suffix. Anything noticeably shorter or longer is wrong before you read a single character.
4. If you are unsure, paste your kept copy into a text field and put the two strings on top of each other. Comparing two lines of text beats comparing a screen against a memory.

When it does not match

Close it. Not investigate it, not read a little more of it to see whether it seems fine, close it. There is no useful information to gather from a page that answered on the wrong string, and every extra second spent on it is a second in which you might type something.

Then go back to your set of addresses rather than to a search box. This is the reason holding the whole set is worth the trouble. A mismatch is exactly the moment when a hurried search would happen, and a hurried search is how people find the very page they were trying to avoid.