Interview with Jan Møller & Kresten Krab
summary
Walks through building a private‑key‑only client: a Java library then an Android app that keeps the private key on the phone while delegating blockchain verification to a cloud backend, noting the full ledger size at about 22 gigabytes of blockchain and a burst of productivity that produced 25,000 lines of code in two months. Describes integration with an Austrian team to produce a self‑contained hardware wallet with display, keyboard and radio, and explains why merchant adoption (PayPal partnerships) and key custody remain the real hurdles.
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