The most common objection to onchain reinsurance from traditional market participants is not the concept — it's the infrastructure. Cedants and reinsurance brokers accepting tokenised coverage need to answer a simple question: who is holding the collateral, and can we trust them? That question leads directly to two names: Circle (issuer of USDC, the dominant onchain collateral currency) and BNY Mellon (the world's largest custodian, now offering regulated digital asset custody). Together they form the institutional-grade custody stack that makes onchain reinsurance credible to TradFi.
Why USDC became the standard for onchain reinsurance
Onchain reinsurance protocols need a stable, liquid, widely-accepted currency for capital pools. Volatile cryptocurrencies like ETH or BTC introduce mark-to-market risk into what should be stable collateral — a reinsurance pool that can lose 30% of its value in a week due to token price movements is not credible reinsurance collateral. USDC, issued by Circle, solved this problem. It is: - 1:1 backed by cash and short-duration US Treasury securities, held in regulated US financial institutions - Audited monthly by a Big Four accounting firm (Grant Thornton) with public attestations - Regulated as a money services business in the US; Circle holds an EU Electronic Money Institution (EMI) licence - Widely integrated across DeFi protocols, meaning it can be used in Aave, Compound, and other yield protocols for idle capital strategies - Institutional-familiar: major banks, asset managers, and fintechs already hold and transact USDC For Ensuro, onRe, and MembersCap — all of which use USDC-denominated capital pools — this means their collateral is a regulated, audited, dollar-equivalent instrument. That is a fundamentally different proposition to unaudited protocol tokens.
Circle's regulatory posture matters
Circle has deliberately pursued regulatory clarity rather than regulatory arbitrage. It applied for a US national bank charter (subsequently withdrawn, but signalling intent), obtained its EU EMI licence (allowing USDC issuance under MiCA), and publicly advocates for stablecoin regulation. For reinsurance specifically, Circle's regulatory positioning is relevant to the admissible assets question. If USDC is issued under a regulated EMI framework with audited reserves, the argument that it can serve as admissible reinsurance collateral under regulatory frameworks like Bermuda's Insurance Act becomes materially stronger than if the issuer were unregulated. The BMA and other insurance regulators are watching Circle's regulatory development closely — progress toward full stablecoin regulation in major jurisdictions would likely accelerate the recognition of USDC as admissible reinsurance collateral.
BNY Mellon: the custodian that TradFi trusts
BNY Mellon (Bank of New York Mellon) is the world's largest custodian bank, with over $45 trillion in assets under custody. It is the custodian that pension funds, sovereign wealth funds, and reinsurers already use for traditional assets. In 2022, BNY became the first major US bank approved by the OCC to offer digital asset custody services to clients. Why this matters for onchain reinsurance: The custodian bridges two worlds. A reinsurer or ILS fund that wants to hold tokenised assets — USDC in a smart contract, tokenised cat bond exposure — can now use a custodian it already has a relationship with. BNY Mellon's digital custody offering means the same entity that safekeeps the fund's Treasury portfolio can also custody its tokenised reinsurance positions. Institutional confidence. The systemic importance of BNY Mellon (it is a US G-SIB — Global Systemically Important Bank) means counterparties, auditors, and regulators treat its custodial involvement as a strong signal of institutional-grade controls. A cat bond SPV backed by USDC in BNY Mellon custody is categorically different, from a risk management perspective, from USDC in an anonymous multisig. The path to admissibility. As insurance regulators work through whether tokenised stablecoin collateral is admissible, the involvement of BNY-grade custodians is likely to be a positive factor. Regulatory frameworks tend to require that collateral be held by a regulated, creditworthy institution — BNY Mellon is both.
The full custody stack in practice
For an onchain reinsurance transaction to be credible to a TradFi cedant, the full stack needs to work: 1. Insurance risk layer: The protocol (Ensuro, onRe) underwrites the risk via smart contract 2. Collateral currency: USDC — regulated, audited, dollar-equivalent 3. Custody: Ideally a regulated custodian (BNY Mellon-grade) rather than purely self-custodied smart contracts 4. Regulatory framework: BMA Innovative Insurer or DABA licence for the fund/protocol 5. Legal documentation: Bermuda-law reinsurance contract referencing the onchain settlement mechanism Not all current protocols have every layer in place — Ensuro and onRe rely primarily on smart contract custody rather than a regulated custodian like BNY. But the direction of travel is clear: as the market matures, the protocols that build institutional-grade custody stacks will be the ones that win cedant and broker acceptance.
The convergence thesis in one sentence
Circle provides the regulated collateral currency, BNY Mellon provides the regulated custody, the BMA provides the regulatory framework, and smart contracts provide the settlement infrastructure — together, these pieces make onchain reinsurance credible to the institutions that currently control trillions of dollars of insurance risk.