In the high-stakes world of venture-backed startups, not growing is the same as dying. Historically, stalled companies sought a sympathetic acquirer or quietly shut down. Now, startups have a new potential lifeline: They pivot to blockchain. Kik kicked things off in September. The messaging app, which has struggled under competition from Facebook and Instagram, created its own cryptocurrency called Kin, which can be used to buy and sell things via the Kik app today, and other apps in the future.

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