Sicherer has two grammatical readings in German. As an inflected adjective it means secure, as in a secure bitcoin; as a comparative it means safer. Both fit a business that helps people protect their holdings better than before. BTC, the ticker, keeps the name short and familiar to anyone who has used an exchange. The .de ending places the offer in the German market, where users look for advice and products in their own language.
Within the Wallet & Storage collection the name carries a clear consumer message. It suits a German guide to wallet security, a service that checks and improves existing setups, a shop for backup and storage hardware, or a training course on protecting keys against phishing and loss. Banks and insurers could also use it for an awareness campaign aimed at customers holding bitcoin.