Chain selection is a risk committee decision

Chain selection for institutional tokenisation has stopped being an engineering decision. What a risk committee prices is operating record, custody support from providers it's already approved, and enough existing tokenised assets to sit beside. The technology evaluation is a footnote to those 3, and the committee's answer keeps getting easier to defend.

The receipts stack quickly. On 3 August 2026 BlackRock launched BSTBL, a tokenised share class on Ethereum of an existing US money market fund, designed to qualify as an eligible reserve asset under the GENIUS Act. One day later it opened tokenised access to $311 billion of European money market fund assets: 12 new tokenised share classes across 6 UCITS funds in 15 markets, sterling, euro and dollar classes included, built with JPMorgan's Kinexys platform. The sequencing is the story. JPMorgan's own JLTXX went live on public Ethereum on 13 May 2026 with a $100 million seed and had reached $693 million by 8 July. May was a seed, July was traction, and August is a $311 billion franchise arriving on the same rail.

Step back and the picture is the largest asset manager, the largest custodian and the largest US bank all building on the same public chain: BlackRock issuing, BNY administering BUIDL's underlying sleeve and adding staking to its digital-asset custody platform on 4 August, JPMorgan both operating Kinexys and issuing its own fund. Convergence at that scale happens for a reason. Shared settlement infrastructure is what creates digital markets, and financial infrastructure has always rewarded common standards over fragmented rails; correspondent banking, central clearing and the international depositories are a century of the same lesson.

The second receipt is quieter. On 30 July Ethereum passed 11 years of unbroken block production since its 2015 genesis. An institution selects a settlement layer because the audit trail is clean, the layer has never halted, and credible, approved counterparties are already there. Ethereum clears all 3, which is why the anniversary belongs in an approval memo rather than a greetings card: continuous operation through 2 monetary-policy redesigns and a full consensus migration, with no outage a committee has to explain to its board.

The third receipt is the neighbours. By rwa.xyz's count, the tokenised real-world asset market grew more than 200% over the year to above $30 billion as of early August 2026, with Ethereum holding just over half the market (52.85% as of June 2026). Token Terminal's broader measure put the total above $43 billion with Ethereum at 57.8% as of 16 June 2026. The methodologies differ; the shape doesn't. An issuer arriving today sits beside more than $15 billion of tokenised assets on the same rail, and every issuer that goes live makes the next internal approval easier to defend, because the memo stops arguing theory and starts citing precedent.

Both counts track public-chain issuance only. A fair amount of institutional deployment runs on private and consortium rails, Kinexys Digital Assets' own ledger, Partior and Progmat among them, and never appears in these numbers; even JLTXX, live on Ethereum, keeps its legal register off-chain with allow-listed token balances. The share figures describe the public layer, not the whole system.

Convergence also concentrates a different risk, and the honest version of this argument says so. If the industry's fund shares, reserve assets and collateral increasingly settle on one rail, a single-chain operational event stops being one issuer's problem and becomes a correlated exposure across the shelf. The same committee that approves Ethereum for its 11-year record should ask what the book looks like on the day that record breaks. That question is likely to reach committee packs in 2027, and whoever drafts the answer early will end up writing the sector's concentration limits.

For a bank or asset manager, the operating implication isn't "pick Ethereum." It's that the chain-selection memo now belongs in the same process that approves a new custodian or clearing counterparty, with the same evidence standards: record, coverage, neighbours, and a concentration view. The economics of that process favour incumbency, because each live issuer compounds the next one's case, which is how a technology choice hardens into a market default. Credibly neutral infrastructure with a decade-plus of continuous uptime is a harder thing to build than any product on top of it, and that, not any single fund launch, is the moat.