DeFi

Regulatory status for this October 14, 2026 analysis: The SEC’s 2022 exchange-definition proposal, supplemented in 2023, was withdrawn in June 2025. Its proposed expansion to communication protocol systems did not become an operative amendment. The title and description refer to that historical regulatory theory and its architectural implications, rather than an effective 2026 registration mandate. The Federal Register withdrawal notice is the controlling starting point. Executive summary: an abandoned expansion with lasting architectural significance The central issue in the Rule 3b-16 controversy was whether a system facilitating securities transactions should face exchange regulation even when it neither maintains a conventional order book nor holds customer assets. That question matters to decentralized exchanges, or DEXs, because transaction execution can be distributed across a website, routing software, autonomous contracts, governance participants, and independently supplied liquidity. ...