Pose the question readers are slightly embarrassed to ask: what, in a regulatory rulebook, actually counts as a "crypto asset"? On June 3, 2026, the SEC answered a version of that question by approving proposed rule changes from the three MIAX exchanges — Miami International Securities Exchange, MIAX PEARL, and MIAX Sapphire — adopting listing criteria for options on commodity-based trusts that hold multiple crypto assets. The approval is notable on its own as another venue clearing the path for crypto-trust options. But the more durable artifact is the definition the rules lean on, because definitions in exchange rules quietly decide what is eligible to be wrapped in a regulated product and what is not.
Start with the mechanism the approval enables. The MIAX exchanges already allowed options on shares of a commodity-based trust that holds a single crypto asset, subject to generic criteria, including conditions on the global supply of the crypto asset held. The approved changes extend that framework to trusts holding multiple crypto assets. The way this works under the hood is that the exchanges compute the relevant market value for each crypto asset a trust holds by taking the total global supply of that asset multiplied by its token price. That "global supply times price" calculation is the engine behind the eligibility thresholds — it is how the rule sizes each asset in the basket to decide whether the trust is liquid and substantial enough to support an options market.
"Exchange Rule 402(i)(6)(iii) defines the term “crypto asset” to mean “an asset that is generated, issued and/or transferred using a blockchain or similar distributive ledger technology network, including but not limited to, assets known as `tokens,' `digital assets,' `virtual currencies,' and `coins' and that relies on cryptographic protocols...”"— MIAX Order Approving Proposed Rule Changes, 91 FR 33272, source
That definition deserves to be read slowly, because it is doing real work. "Crypto asset" is defined functionally — by how the asset is generated, issued, or transferred (using a blockchain or similar distributed-ledger network) and by its reliance on cryptographic protocols — rather than by listing specific coins. That is a deliberate drafting choice. A definition tied to a named list goes stale the moment a new asset appears; a definition tied to the underlying technology is durable and elastic, capturing tokens, "digital assets," "virtual currencies," and "coins" alike so long as they share the same ledger-and-cryptography mechanics. For an explainer beat, this is the cleanest illustration of how regulators and exchanges have decided to describe the category: not "these specific things," but "anything that works this way."
Why a definition is a gate
Definitions in listing rules are not academic. They function as gates. If an asset meets the "crypto asset" definition and a trust holding it clears the supply-and-price thresholds, the trust can host options under the approved criteria. If an asset falls outside the definition, it does not get through. So the moment an exchange writes "crypto asset" to mean anything generated, issued, or transferred via a blockchain or similar DLT that relies on cryptographic protocols, it has drawn the perimeter of an entire product category in a single sentence. Approving that definition — as the SEC did here — blesses the perimeter, not just the specific funds.
The multi-asset extension also raises the surveillance bar, and the rules reflect it. Listing options on a basket means the exchange must be comfortable with the markets for every asset in that basket, because a manipulation or liquidity failure in any single component can distort the trust's value and, by extension, the options written on it. That is why the "global supply times price" sizing and the per-asset criteria matter: they are the exchange's way of ensuring each component is large and liquid enough that the basket as a whole can support an orderly derivatives market. The single-asset framework only had to vet one underlying; the multi-asset framework has to vet several at once.
What the order settles
Unlike a mere notice, this is an order approving — the SEC found the MIAX exchanges' proposed criteria consistent with the Exchange Act and let them take effect. So the practical state of play is concrete: the MIAX venues can now list options on multi-crypto trusts under these criteria, joining the broader convergence across options exchanges (including the Nasdaq ISE precedent the filing references and the parallel MEMX proposal still in the comment stage). The category is standardizing in real time, venue by venue.
It is worth pausing on the "global supply times price" sizing method, because it is both clever and quietly assumption-laden. Multiplying an asset's total global supply by its token price yields a market-capitalization figure, which the exchanges use as a proxy for how substantial and hard-to-manipulate an asset is. The logic is sound: a larger, deeper market is harder for any single actor to push around, which matters when options written on a trust derive their value from those underlying assets. But the method inherits the soft spots of both inputs. "Total global supply" can be genuinely ambiguous for crypto assets — the rules have to grapple with what counts as issued, whether locked or unreleased tokens are included, and how to treat assets with elastic or algorithmic supply. "Token price" assumes a reliable, manipulation-resistant reference price, which is itself a hard problem in fragmented crypto markets. None of this makes the approach wrong; it makes the definitional fine print — exactly how supply is counted and which price source governs — the part that determines whether the sizing actually screens out thinly traded or manipulable assets. That fine print is the real investor protection, and it is precisely the sort of detail that a technology-based "crypto asset" definition has to be paired with to work.
The takeaway worth keeping is the one hiding in the definitions section. Headlines will say "SEC approves more crypto options," and that is true. The more lasting fact is that a regulated U.S. exchange's rulebook now contains a technology-based definition of "crypto asset" — generated, issued, or transferred via blockchain or similar DLT, reliant on cryptographic protocols — and that the SEC has approved rules built on it. Whenever you want to know whether some new token can be wrapped in a regulated product, that is the kind of sentence you read first. The mechanism, and the definition that gates it, is the story; the approval is just the moment it became operative.