Original Title: A Former SEC Chief Economist Analyzed How Tokenized Securities Can Benefit From DeFi
Original Authors: @milesjennings, @rstwalker, and Aiden Slavin, a16z crypto

Editor’s Note: When regulators begin proactively advancing “on-chain traditional securities,” the question is no longer whether the technology is feasible—but whether the regulatory system is ready to keep pace. This article centers on a pivotal proposal: against the backdrop of the U.S. Securities and Exchange Commission’s (SEC) push to bring financial markets on-chain, a16z and the DeFi Education Fund jointly proposed the “Software Safe Harbor” framework—aiming to define a regulatory boundary for a new class of market participants: non-custodial, disintermediated blockchain applications.

Its core logic is straightforward: if these applications function solely as neutral software interfaces—neither controlling assets, executing transactions, nor offering investment advice—should they still be subject to the traditional broker-dealer regulatory framework? The analysis by former SEC Chief Economist Craig Lewis provides a more structured answer to this question. Rather than starting from “whether regulation is needed,” Lewis returns to a more fundamental comparison: given that the existing broker-dealer system already suffers from high costs and opacity, does introducing on-chain trading and automated settlement weaken markets—or instead reconstruct how they operate?

On one hand, atomic settlement, on-chain transparency, and 7×24 trading are redefining the efficiency frontier of financial infrastructure. On the other, investor protection mechanisms, market fragmentation, and novel risks are simultaneously emerging. The real disagreement lies not in whether these risks exist—but whether they already exist in alternative forms within the traditional system, having long been overlooked. From this perspective, the “Safe Harbor Proposal” functions more like an institutional experiment: it seeks to open a limited yet verifiable space for on-chain finance—without dismantling the existing regulatory framework entirely.

Accordingly, the central question shifts—from “Should we go on-chain?” to “Which components can go on-chain first?” If the past decade of crypto has been about approaching traditional finance technologically, the next decisive variable may well come from how regulators redefine the boundaries of the “intermediary” role.

Below is the original text:

Bringing traditional securities on-chain is one of the core priorities of the current U.S. Securities and Exchange Commission (SEC). Recognizing the potential of tokenization, the Commission—under Chair Atkins’ leadership—launched “Project Crypto” nine months ago, aiming to modernize U.S. securities rules and the regulatory regime. Its goal is to gradually migrate the national financial market onto blockchains, unlocking benefits such as instant settlement, 7×24 trading, and cost reduction.

Yet to fully unlock the potential of tokenized securities, innovators and investors still require clear “rules of the game”—especially for blockchain applications enabling peer-to-peer trading of tokenized securities without intermediaries. To address this, we—alongside the DeFi Education Fund—submitted a “Software Safe Harbor” proposal to the SEC last August, explicitly defining the conditions under which such blockchain-based applications—i.e., neutral software programs enabling users to interact with public blockchains and smart contract protocols—may be exempt from registration requirements under the Securities Exchange Act of 1934.

This proposal not only explains how such applications create value for market participants but also demonstrates how they align with the SEC’s core mission: protecting investors, maintaining fair and orderly markets, and facilitating capital formation. Today, Professor Craig Lewis of Vanderbilt University—and former SEC Chief Economist and Director of the Division of Economic and Risk Analysis—has formally submitted his economic analysis of this “Software Safe Harbor” proposal to the SEC. While Lewis’s study focuses specifically on the proposal itself, it broadly evaluates the economic costs and benefits of tokenized securities—offering critical insights into how blockchain technology could reshape the traditional financial system. Although this research was funded by a16z, Professor Lewis conducted his evaluation using an independent and rigorous methodology.

In his analysis, Lewis identifies five potential benefits the Safe Harbor mechanism could unlock for compliant applications:

1. Atomic Settlement: Eliminating counterparty credit risk arising from delayed settlement, and reducing systemic risk stemming from central counterparty failure.
2. On-Chain Transparency: Replacing opaque private ledger systems with publicly verifiable transaction records.
3. 7×24 Continuous Trading: Breaking free from traditional exchanges’ temporal and geographic constraints—enhancing price discovery efficiency and liquidity.
4. Substantial Cost Reduction: Automating dividend distributions, compliance processes, and more via smart contracts. For example, research by Ripple and BCG shows tokenizing investment-grade bonds can reduce operational costs by 40%–60%.
5. Lowered Entry Barriers: Attracting new developers into the market, exerting competitive pressure on traditional financial institutions to innovate—and ultimately benefiting end users.

At the same time, Lewis outlines four categories of potential costs associated with the proposal:

1. Weakened Investor Protection: For instance, traditional brokers can freeze assets or reverse transactions, whereas compliant applications—by design—lack this capability.
2. Regulatory Arbitrage Risk: Some traditional institutions may attempt to restructure themselves as compliant applications to evade regulatory obligations—though their transition costs may be high.
3. Market Fragmentation Risk: Tokenized securities trading could further fragment market liquidity and transmit risk into the traditional financial system via DeFi leverage mechanisms. However, Lewis argues such risks should be assessed comparatively against already-existing dark pools and over-the-counter trading systems.
4. Retail Trading Cost Concerns: Including volatility in gas fees, slippage, and smart contract vulnerabilities—but these should be weighed against implicit costs in traditional finance. Meanwhile, DeFi fees are falling significantly—for example, Ethereum’s Dencun upgrade reduced Layer 2 data costs by over 90%.

Lewis’s analysis is explicitly limited to frontend applications meeting the Safe Harbor criteria—and emphasizes that these applications are fundamentally “passive software interfaces” whose design does not introduce the types of risks the Securities Exchange Act aims to mitigate. These criteria include: non-custodial architecture, absence of autonomous trade execution authority, no marketing or investment advice provision, and integration exclusively with truly decentralized (or actively decentralizing) protocols.

He further stresses that the appropriate benchmark for comparison is not some idealized market structure—but rather today’s broker-dealer system, which entails substantial implicit costs including DTC fees, clearing and settlement charges, intermediary markups, and insurance buffers. Ultimately, Lewis concludes: if the SEC formally evaluates these costs and benefits, it will likely find that the Safe Harbor mechanism helps unlock the significant economic value embedded in tokenized securities.

As Chair Atkins stated, tokenization “could reshape the financial system as we know it.” The SEC has already signaled support for this direction through initiatives like “Project Crypto” and joint guidance documents. Yet to realize this vision, a clear and effective regulatory framework remains essential—for blockchain applications enabling peer-to-peer trading. That is precisely the objective of this Safe Harbor proposal—and Professor Lewis’s analysis confirms its overall economic logic is compelling: though trade-offs exist, the benefits are likely to outweigh the costs. Lewis has mapped the path forward—we now await the Commission’s next steps.

[BlockBeats]