Unlike a SKU (Stock Keeping Unit) that might have a code for "Blue Shirt," these strings are "opaque," meaning they tell you nothing about the item until you look it up in a database. Common Use Cases

The string 1mzqwgu7e8th4t4bejzxlrttcup2re5jfi appears to be a legacy Bitcoin address

The string is a prime example of a non-human-readable, secure, and unique identifier. What is a Unique Identifier?

The provided alphanumeric string, 1mzqwgu7e8th4t4bejzxlrttcup2re5jfi

How can you actually verify your ownership of bitcoin? - Unchained

: A clear description of exactly what happened, where, and when, without using emotional or biased language.