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Smart contract technology for the blockchain. Establishing “the blockchain analog of debit cards, enabling payment within seconds on a side-chain without sacrificing the security guarantees of a trustless decentralized consensus.”

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Makers of DUO, a portable lightweight second-monitor attachment for laptops.

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Boston Startups Guide started five years ago as a simple directory of startup companies in Boston. Now that startup list has grown to a well-curated (no services companies, no zombie startups, no yet-another-ecommerce sites) resource for finding innovation happening in your industry, and the latest in Boston tech. New startups are added regularly.