Wall Street's largest clearinghouse launches live blockchain testing, marking a key step in stock tokenization.

Wall Street’s stock clearing system is about to undergo a limited but symbolically significant blockchain pilot.

This week, DTCC (Depository Trust & Clearing Corporation), the largest securities clearing institution in the U.S., will conduct a live blockchain transaction demonstration involving stocks, U.S. Treasuries and other assets. This is DTCC’s first real-world test after years of exploration, assessing the feasibility of blockchain-based ownership recording in production, with participation from over 50 financial and crypto institutions.

However, DTCC made it clear: blockchain currently is too costly to handle the daily tens of trillions in U.S. stock market settlements, and the existing clearing system will not be replaced in the short term.

Limited scale test, full launch as early as October

This test is just a one-day limited production transaction, not a full rollout.

DTCC received a “No Action Letter” from the U.S. Securities and Exchange Commission (SEC) at the end of 2025, valid for three years, allowing it to launch new tokenization services to create blockchain records for specific securities. The scope covers Russell 1000 index components (representing the largest U.S. public companies by market cap), ETFs, short-term U.S. Treasuries, bonds, and notes.

The purpose of this live test is to verify whether blockchain processes function properly and if market participants can operate effectively. DTCC states that the target for full rollout is this October.

The tokenization applies to stocks already held in custody accounts. DTCC plans to give financial institutions the option: convert these shares into blockchain tokens, enabling institutions to transfer tokens directly among themselves for purposes such as collateral and financing.

Why blockchain cannot replace the existing clearing system

To understand this limitation, it’s necessary to first understand the operational logic behind stock transactions.

Once a stock transaction is completed, it goes through three stages: confirmation, clearing (reconciling funding gaps between parties), and settlement (actual delivery of shares and cash). DTCC currently sits at the core of this system.

The most crucial mechanism is net settlement (netting): DTCC offsets institutions’ buy and sell orders against each other, ultimately transferring only a net amount, rather than settling every transaction individually. This mechanism compresses around $20 trillion in daily market activity to about 2% that needs actual movement of funds.

Blockchain operates on the opposite logic—it is better suited for processing transactions one by one. Tom Sullivan, DTCC’s Digital Asset Solutions head, said bluntly: “A system fully based on individual-by-individual settlement can't work at this scale. There isn't enough money in the system to support it.”

DTCC clarified it does not intend to use tokenization to change the stock clearing process; about 98% of daily stock trades will still be dealt with by net settlement. Cash settlement will remain dependent on the Fedwire system, not blockchain.

According to Larry Tabb, head of market structure research at Bloomberg Industry Research, the scale of DTCC’s tokenized stocks “won’t reach even half a percent of traditional stock value,” and “won’t threaten the status quo—this is very complicated.”

Most practical use: collateral and financing

Since blockchain can't disrupt clearing, where does its value lie?

DTCC’s answer: collateral and financing markets.

After stocks are cleared and settled, they are typically held at a central custodian and can be used as collateral for financing or lent for short selling. With tokenization, institutions can more quickly transfer the rights to these shares on-chain for use as collateral to raise funds, increasing capital efficiency.

This scenario isn’t as grand as “disrupting the clearing system,” but the collateral and financing markets themselves are huge and have real needs for speed and flexibility.

Bridging crypto markets: breakthrough in weekend settlement

Another area with potential is connecting traditional stock markets and crypto markets.

Currently, crypto tokens representing Tesla, Apple, and other shares have been issued to overseas investors, backed by real shares at brokers or custodians—the logic is similar to the $300 billion stablecoin market allowing global users to hold USD.

According to RWA.xyz data, Ondo Finance and Kraken’s xStocks have combined issued about $1.3 billion in such tokens. Last month, the crypto exchange Binance also launched the bStocks product; Shunyet Jan, its business lead, says a major appeal of bStocks is “trading on weekends.”

But there is a pain point in the current model: stock markets close on weekends, so the shares backing the tokens cannot be settled in real time. For example, with Ondo, if prices fluctuate sharply over the weekend, settlement must wait until Monday when markets reopen, possibly increasing transaction costs drastically or even making settlement difficult.

Ondo CEO Ian De Bode says the company hopes to use DTCC tokenized stocks as the underlying asset for its stock tokens. DTCC’s system could allow some stock entitlements to circulate over the weekend, making weekend settlement “significantly easier for us.”

Lessons from Project Ion

This is not DTCC’s first blockchain attempt.

In 2022, DTCC announced the “Project Ion” pilot, joining with JPMorgan, Robinhood, and 16 other firms to explore blockchain settlement for stock trades. But according to a 2024 report from The Information, after the pilot, the project was shelved—the reason being clients were already satisfied with the current system and had no motivation to switch.

This history highlights a key challenge for the new service: beyond technical feasibility, getting institutions willing to migrate is the decisive variable for how far tokenization can go.

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