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The Federal Reserve Bank of Boston (Boston Fed) and the Massachusetts Institute of Technology’s Digital Currency Initiative (MIT DCI) are collaborating on exploratory research known as Project Hamilton,
From Project Hamilton Phase 1 Executive Summary – Federal Reserve Bank of Boston.
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Despite using ideas from blockchain technology, we found that a distributed ledger operating under the jurisdiction of different actors was not needed to achieve our goals. Specifically, a distributed ledger does not match the trust assumptions in Project Hamilton’s approach, which assumes that the platform would be administered by a central actor. We found that even when run under the control of a single actor, a distributed ledger architecture has downsides. For example, it creates performance bottlenecks, and requires the central transaction processor to maintain transaction history, which one of our designs does not, resulting in significantly improved transaction throughput scalability properties.
Well, I imagine that the core of their discovery was that a blockchain is a very specific solution to the problem of forming consensus in the presence of untrusted third parties but in a Federal Reserve digital currency of any kind there would be no such parties.
CBDC design choices are more granular than commonly assumed. Currently, CBDC designs are categorized as direct, two-tier, or hybrid models, with “token” or “account” access models 1 2 7 12 15. We found these limited categorizations lacking and insufficient to surface the complexity of choices in access, intermediation, institutional roles, and data retention in CBDC design 10. For example, wallets can support both an account-balance view and a coin-specific view for the user regardless of how funds are stored in the database.