Short and to the point business name that plays on the word "crypto" (as in "cryptocurrency", "cryptography").
The name "cryptena" has eight characters and three syllables. Leading companies using three syllable names include McDonald's, Grammarly and Toshiba.
Cryptena.com is a dot com domain. Dot com domains are the most prestigious domain extension in the world, famously used by websites like youtube.com. Owning a dot com says that you own the word "cryptena" online.