Tokenised Treasury Bills: How Crypto Is Bringing Government Bonds On-Chain

US government debt is now sitting on a blockchain, earning yield for anyone with a crypto wallet and a stablecoin. Tokenised Treasury bills passed £5 billion in total value this year, and UK investors are starting to notice a product that looks almost boring on paper but works in a genuinely new way. When I looked into how these tokens actually function, the mechanics turned out simpler than the hype suggested. Government debt meeting DeFi sounds like a mismatch. It isn’t, once you see the plumbing underneath.

What Is a Tokenised Treasury Bill?

A Treasury bill is a short-term loan to the US government, sold at a discount and redeemed at face value when it matures. It’s one of the safest instruments in traditional finance, backed by the full faith of the US Treasury.

A tokenised version wraps a real, custodied basket of these bills inside a blockchain token. Own the token, and you own a proportional claim on the underlying bills, with the yield passed through to your wallet automatically.

BlackRock’s BUIDL fund and Franklin Templeton’s BENJI token are the two largest players in this space right now, together holding well over £3 billion in tokenised Treasury exposure. Neither is a stablecoin — both fluctuate slightly and pay real yield, unlike a dollar-pegged token that just sits flat.

Why Put Treasuries on a Blockchain at All?

The obvious question: why bother? Government bonds already work fine through a regular brokerage account.

Settlement speed is the first answer. Traditional Treasury purchases settle in one to two business days. On-chain transfers of a tokenised bill settle in minutes, any day of the week, including weekends when traditional markets are shut.

Composability is the second, more technical answer. A tokenised Treasury bill can be used as collateral inside a DeFi lending protocol, something a paper bond certificate obviously can’t do. That unlocks yield-stacking strategies that don’t exist in traditional finance — for better and for worse.

Who’s Actually Buying These?

Crypto-native treasuries hold a huge share. DAOs and stablecoin issuers sitting on large cash reserves want yield without leaving the blockchain ecosystem, and tokenised Treasuries let them earn roughly 4-5% without touching a traditional bank.

Circle, the issuer of USDC, holds a meaningful chunk of its reserves in short-dated Treasuries already — tokenisation just makes that exposure programmable and transferable on-chain rather than locked inside a traditional custodian relationship.

Institutional interest is growing too, though slower. Hedge funds testing DeFi strategies use tokenised Treasuries as a low-risk base layer, parking idle capital there between trades rather than leaving it earning nothing.

A smaller but notable group: crypto-native businesses paying contractors or holding operational reserves. Rather than converting to fiat and losing blockchain-native flexibility, they hold a yield-bearing token instead — earning something on funds that would otherwise sit idle in a stablecoin wallet.

The Custody Question

Here’s where it gets less exciting and more important. The underlying Treasury bills aren’t actually on the blockchain — they’re held by a regulated custodian, with the token acting as a claim ticket on that holding.

This means tokenised Treasuries carry a layer of trust that pure crypto assets don’t. You’re relying on the custodian to actually hold what they claim, audited and verified, rather than trusting cryptographic proof alone.

BlackRock’s BUIDL uses Bank of New York Mellon as custodian and publishes regular attestations. Smaller, newer entrants in this space don’t always have the same institutional backing, and that gap matters enormously if something goes wrong.

Falls apart fast for any product skipping proper custody and audit trails. UK investors should check who actually holds the underlying assets before assuming “tokenised Treasury” means the same risk profile across every provider.

A useful habit: search for the custodian’s name directly, not just the token issuer’s. If a provider won’t name who’s actually holding the bonds, that’s a red flag worth taking seriously regardless of how polished the website looks.

Regulatory Status for UK Investors

The FCA hasn’t issued Treasury-tokenisation-specific guidance yet, leaving these products in a grey zone under existing securities rules. Most tokenised Treasury products currently restrict access to accredited or institutional investors, not UK retail buyers, a gatekeeping step that mirrors how new financial products often launch cautiously before wider rollout.

That’s changing slowly. The UK’s Digital Securities Sandbox, launched to test tokenised financial instruments under regulatory supervision, has begun reviewing applications from firms wanting to offer similar products to a broader UK audience.

Until clearer rules land, most UK retail investors accessing this space do so through offshore platforms — a route that carries its own tax and consumer-protection complications worth understanding before diving in.