Also see the LifeHash Best Practices.
Clearly Type Your Object
The OIB suggests that you use an icon to type an object, but it can be beneficial to go beyond that. Consider if you want to use different background colors, different formats, or other hints to show different types of objects.
If a user is looking at a seed on one screen and a key on another, you don’t want them to think they might be the same thing!
Be Aware of What You’re Hashing
When possible, use the cleanest, most original data that you can. Use the digest source specifications for seeds, keys, and anything else that has been specified, for interoperability. Try to use original data over constructed data for other representations.
Differentiate Your Hashes When Possible
The default Blockchain Commons suggestions for OIB include two types of hashes, a seven-digit “abbreviated digest” for the object and an eight-digit master fingerprint (when appropriate).
This differential is appropriate and a good rule of thumb: if you have different types of hashes as part of your OIB try to differentiate them rather than displaying identical looking data that means two different things.
Be Aware of How You Abbreviate Hashes
We abbreviate our OIB hash to seven characters. Abbreviating to just the first and last characters is another common technique. However, be aware of what those characters represent. In some cases (such as Bitcoin addresses) a leading character is always the same. Too much of that, and your hash isn’t meaningful!