BlackRock Ships BSTBL and BRSRV: Two Tokenized Funds Built for GENIUS Act Stablecoin Reserves
BlackRock has launched BSTBL and BRSRV, two tokenized money market products intended to qualify as reserve assets for GENIUS Act payment stablecoin issuers. The Ethereum-based share class and multi-blockchain reserve vehicle expand BUIDL into a full on-chain cash-management product family.
BlackRock launched BSTBL and BRSRV on August 3, adding two tokenized money market products to a franchise previously represented on-chain chiefly by BUIDL. The products are built around a specific customer need: giving permitted payment stablecoin issuers a regulated pool of cash, short-term Treasuries and Treasury-backed repo that BlackRock says is intended to qualify as an eligible reserve asset under the GENIUS Act. [1]
The move matters because it turns a successful tokenized fund into a shelf of purpose-built cash instruments. BSTBL brings an existing Treasury liquidity strategy to Ethereum, while BRSRV is a newly launched, multi-blockchain vehicle whose daily reinvestment feature and name directly address stablecoin reserve operations. [1]
From One Flagship to a Cash-Management Family
BSTBL, the BlackRock Select Treasury Based Liquidity Fund OnChain Shares, is not a new underlying fund. It is a tokenized share class of BlackRock's existing Select Treasury Based Liquidity Fund, represented on Ethereum and transferable between approved investor wallets, subject to applicable law. BNY is both transfer agent and tokenization provider, placing the product in a model where an established cash fund receives a blockchain-native distribution and recordkeeping layer. [1]
BRSRV takes the opposite construction route. The BlackRock Daily Reinvestment Stablecoin Reserve Vehicle is a new tokenized money market fund for digitally native institutions, with Securitize serving as both transfer agent and tokenization provider. Its dividend is automatically reinvested each day, and its multi-blockchain accessibility is designed for digital-asset uses that include stablecoin reserve management. [1]
Both products seek current income while preserving liquidity and stability of principal through cash, short-term U.S. Treasuries and overnight repurchase agreements backed by Treasuries. The difference is not the quality of the collateral pool. It is the operational wrapper, distribution rail and buyer workflow that BlackRock is choosing to serve.
Fund — Structure — Blockchain availability — Transfer agent and tokenization provider — Primary use case
BUIDL — BlackRock USD Institutional Digital Liquidity Fund — Eight networks: Ethereum, Avalanche, Solana, Polygon, Aptos, Arbitrum, Optimism and BNB Chain — Securitize — Institutional on-chain cash, collateral and yield
BSTBL — OnChain share class of an existing Select Treasury Based Liquidity Fund — Ethereum — BNY — Tokenized Treasury liquidity for approved investors
BRSRV — Newly launched stablecoin reserve money market vehicle with daily dividend reinvestment — Multi-blockchain — Securitize — Stablecoin reserve management and digitally native institutional cash
The GENIUS Act Creates the Buyer
The key demand driver is statutory rather than technological. The GENIUS Act requires permitted payment stablecoin issuers to maintain one-to-one reserves and publish monthly information on their composition. Its eligible-reserve framework expressly contemplates certain investment-company securities and money market funds invested in permitted liquid assets, alongside currency, deposits, Treasuries and qualifying repo. [2]
That gives BlackRock a clear commercial opening. A stablecoin issuer is not simply deciding where to park cash overnight; it is selecting assets that must work across reserve policy, custody, attestations, redemptions and an on-chain operating model. BSTBL and BRSRV are therefore products for a compliance workflow as much as an investment allocation. Their stated intention to be eligible reserve assets is material, but it is not a substitute for each issuer's own legal, risk and operational assessment under the final rules.
The launch also reframes the 20 percent tokenized-reserve cap dispute covered earlier in NewCurrency's GENIUS Act reporting. A cap, if applied across an issuer's aggregate tokenized holdings, would still constrain the market. Yet the commercial argument is no longer about whether one fund, BUIDL, can carry the category alone. BlackRock can now offer different structures for Ethereum liquidity, multi-chain reserve operations and its established institutional digital liquidity fund. Product variety does not remove a regulatory ceiling, but it reduces the strategic importance of a single product's design.
BUIDL Supplied the Proof Point
The expansion arrives after BUIDL demonstrated that qualified institutions will use tokenized cash at scale. On July 14, BUIDL's reported on-chain assets reached $2.93 billion, with roughly $1.1 billion on Ethereum, about $902 million on Avalanche after a near-doubling in a week, and more than $550 million on Solana. [3] That eight-network footprint is the infrastructure base that BSTBL and BRSRV can now complement rather than replicate.
BUIDL has also returned cash to holders rather than merely holding a one-dollar token steady. Securitize reported more than $70 million of dividends paid since launch, including $8.3 million in August 2025. [6] At BUIDL's March 2024 debut, BlackRock Head of Digital Assets Robert Mitchnick described the objective in practical terms:
“We are focused on developing solutions in the digital assets space that help solve real problems for our clients, and we are excited to work with Securitize.” [4]
BSTBL and BRSRV make that earlier statement more concrete. A single flagship fund established the evidence of demand; a family lets BlackRock tailor the product to the chain, the transfer-agent model and the role cash plays in a client's balance sheet.
The Distribution Race Is Moving On-Chain
The strategy also reaches beyond stablecoin issuers. Circle has said BlackRock is expected to deploy BUIDL on Arc, its planned institutional blockchain, using native USDC so investors can subscribe, redeem and deploy fund assets in a single on-chain environment. [5] That integration points to the end state BlackRock is pursuing: fund shares, stablecoins, collateral and settlement working inside connected financial workflows rather than as separate crypto products.
The same product-design logic is visible in the Ripple and Aviva Investors XRPL initiative, which has put a Central Bank of Ireland-approved tokenized fund structure on a public chain. The competitive question is increasingly not whether a fund can be tokenized. It is whether the issuer can make the fund usable under the relevant legal regime, on the relevant network and in the relevant treasury workflow.
BlackRock's answer is now three products rather than one. BUIDL proved the category, BSTBL gives approved Ethereum investors a tokenized version of an established Treasury strategy, and BRSRV packages the daily reinvestment and multi-chain features a stablecoin reserve operator may want. For the GENIUS Act market, that is the beginnings of a cash-management platform, not a tokenization experiment.
References
[1] BlackRock, "BlackRock Expands Tokenized Cash Platform with BSTBL OnChain Shares and BRSRV," August 3, 2026. https://www.blackrock.com/cash/en-us/press-release-t3
[2] U.S. Congress, "S.1582, GENIUS Act," July 18, 2025. https://www.congress.gov/bill/119th-congress/senate-bill/1582
[3] Bitget News, "BlackRock's on-chain tokenized assets reach $2.93 billions as BUIDL accelerates expansion to multiple chain ecosystems," July 14, 2026. https://www.bitget.com/amp/news/detail/12560605503866
[4] Business Wire, "BlackRock Launches Its First Tokenized Fund, BUIDL, on the Ethereum Network," March 20, 2024. https://www.businesswire.com/news/home/20240320771318/en/BlackRock-Launches-Its-First-Tokenized-Fund-BUIDL-on-the-Ethereum-Network
[5] Circle Internet Group, "Circle Announces Founding Validator Cohort and Major Integrations for Arc Ahead of September 16 Mainnet Launch," August 5, 2026. https://www.circle.com/pressroom/circle-announces-founding-validator-cohort-and-major-integrations-for-arc-ahead-of-september-16-mainnet-launch
[6] Securitize, "BlackRock's BUIDL is setting the benchmark for onchain finance," August 15, 2025. https://www.linkedin.com/posts/securitize_blackrocks-buidl-is-setting-the-benchmark-activity-7368745317673947137-HHQg