Attestation vs recomputation, as of July 6, 2026
How are you shown the money?
Every synthetic dollar claims to be fully backed. The question that actually separates them is how you are shown that backing. At one end, a figure an attestor publishes that you read and trust. At the other, a reserve you recompute yourself from public inputs. Here are five ways the field answers it, each named fairly and sourced, including where Kerne lands in the same place as everyone else. This is Kerne, kerne.fi, the Base delta-neutral synthetic dollar.
The one axis the category is fighting over.
A synthetic dollar can be perfectly backed and still leave you unable to check it. So the honest axis is not whether a protocol claims full backing, which they all do, but what it hands you to verify that claim. There are really two ends. At one, the reserve is a number a third party publishes after reading accounts you cannot see, and you trust that the third party saw the truth. At the other, the inputs are public, so you reproduce the number yourself. Most of the field lives near the first end, in one of a few shapes. Kerne is built for the second, on the leg where the architecture allows it.
None of these models is wrong. A Deloitte letter, a Chainlink Proof of Reserves feed, a zero-knowledge attestation of exchange balances: these are legitimate, often excellent, and adopting them is a real improvement over saying nothing. We name each one accurately rather than pretending it is negligence. The only point of this page is to be precise about where verification ends and trust begins, and to make every claim on it checkable, because the checkable-ness is the argument.
The five models at a glance.
| Model | What you are asked to trust | Representative | Recompute reserves without an attestor? |
|---|---|---|---|
| Trust the auditor | You trust the auditor. | Falcon FinanceUSDf / fUSD | No |
| Trust the oracle and the partner | You trust the oracle and the partner. | AxisUSDx / sUSDx | No |
| Trust the consortium | You trust the consortium, and eventually the rules. | Open USDOUSD (Open Standard) | No |
| Trust the custodian attestation | You trust the custodian attestation. | EthenaUSDe / sUSDe | No |
| Run the numbers yourself | On the reserve leg, none you cannot check yourself. | Kerne (this site)kUSD / skUSD | Yes |
Read the four to the left as legitimate, well-run ways to be shown reserves, not as failures. The bright line is only the last column, and it is a property of the architecture, not of effort or scale. Each cell is expanded and sourced below, cross-verified on July 6, 2026.
The five models, in full.
Each model is described through the same four questions, with the same candor, including ours. What it is, how you are shown the reserves, the trust boundary you are left with, and its stage and scale.
Trust the auditor
What it is
CeFi-custodied, overcollateralized and delta-neutral synthetic dollars. USDf is the established token; fUSD is a separate, GENIUS-ready token Falcon launched on May 27, 2026. Backing sits in off-chain custody across Binance, Fireblocks, Ceffu and ChainUp, with a small on-chain slice.
How you are shown the reserves
A daily transparency dashboard shows a per-custodian dollar total. USDf is attested by HT Digital (Harris and Trotter affiliated, a BKR member firm) with weekly letters and quarterly ISAE 3000 reports. fUSD is custodied at Anchorage Digital Bank and attested monthly by Deloitte. The authoritative reserve figure is a dollar total an auditor publishes.
The trust boundary you are left with
You trust the auditor. The reserve reports state the dollars held at each custodian; they are not enumerated wallet addresses you can rehash against the chain. You read the attestation and trust that a real firm, HT Digital or Deloitte, saw the accounts.
Stage and scale
Live and among the larger synthetic dollars, over a billion dollars of USDf outstanding in mid-2026, with a recovered depeg in July 2025. Two auditors of genuine standing across the two products. This is a mature, well-disclosed version of the attestation model.
Trust the oracle and the partner
What it is
A CeFi-custodied delta-neutral synthetic dollar (USDx) and its staked wrapper (sUSDx), positioned as a multi-asset yield hub offering, in its own words, verifiable and uncorrelated yields. Custody at Fireblocks and Fordefi, off-exchange mirroring at Copper and Ceffu.
How you are shown the reserves
Chainlink Proof of Reserves and Accountable's zero-knowledge Data Verification Network publish an attested reserve value on-chain. Audited by Zellic. Backed by a 5 million dollar round led by Galaxy Ventures in December 2025 (OKX Ventures, CMT Digital, FalconX, GSR, Maven 11, CMS Holdings and Marc Zeller among the investors).
The trust boundary you are left with
You trust the oracle and the partner. Chainlink and Accountable read custodian and exchange accounts you cannot see and publish an attested figure on-chain. It is a value you read, high-integrity and independent, but not one you re-derive from the underlying accounts yourself.
Stage and scale
Pre-launch as of early July 2026. USDx is deployed on Plasma but not yet tradeable, running a private testing phase with a public waitlist, coming to Ethereum and Plasma. Its verifiable-yields positioning describes the intended design, not a live and measurable surface a holder can check today.
Trust the consortium
What it is
A consortium payment stablecoin announced on June 30, 2026 by a company called Open Standard, named alongside more than 140 businesses including Visa, Stripe, Mastercard and Coinbase. Zero fees to mint and redeem, with reserve revenue shared to the businesses that distribute the token.
How you are shown the reserves
Not yet. The published reserve disclosure to date is one sentence: reserves are maintained at major financial institutions in compliance with US regulatory requirements. As of July 2026 no custodian, auditor, attestation cadence, reserve composition, or named regulated issuing entity has been published, and no token contract is live (press reports name Solana as the first chain; the official site names none).
The trust boundary you are left with
You trust the consortium, and eventually the rules. As a payment stablecoin, it cannot pay its holders yield: GENIUS Act Section 4(a)(11) bars a permitted payment-stablecoin issuer from paying holders any interest or yield. Open USD routes reserve revenue to distributors instead; whether that clears the OCC's proposed March 2, 2026 rebuttable presumption on affiliate and third-party yield is unsettled and untested, and no regulator has addressed Open USD.
Stage and scale
Announced, not shipped; a launch is planned for later in 2026. It carries the largest partner roster the market has announced and, to date, the smallest reserve disclosure. Nothing here is a knock: a pre-ship consortium not publishing a full diligence stack yet is normal. The point is only that the surface a holder would check does not exist yet.
Trust the custodian attestation
What it is
The largest and longest-lived synthetic dollar, live since 2024, roughly 4.4 billion dollars outstanding. CeFi-custodied and delta-neutral, fully collateralized. This is the proven, audited incumbent, and nothing here suggests it is under-backed.
How you are shown the reserves
A transparency dashboard links some collateral wallets on-chain, alongside weekly Proof of Reserves and monthly signed custodian attestations from Copper, Ceffu, Anchorage and Kraken. Chaos Labs' Edge oracle continuously verifies, inside a trusted-execution enclave, that the backing covers supply and that the position is delta-neutral, which is more than most designs check.
The trust boundary you are left with
You trust the custodian attestation. The reserve is partly readable on-chain, but the off-exchange custody and the entire short-hedge leg reach you as an attestation you read, not as position records you re-derive. For a custodied design at this size that is the normal structure, not a defect.
Stage and scale
The category's incumbent: deep liquidity, real audits, the most institutional adoption of any synthetic dollar, and the most rigorous version of the attested-custodian model in the field.
Run the numbers yourself
What it is
An on-chain delta-neutral synthetic dollar on Base. kUSD mints one for one from USDC through an on-chain Peg Stability Module, and skUSD is the staked wrapper that passes through the delta-neutral yield to a staker who explicitly enters it.
How you are shown the reserves
The reserve is raw-readable directly from Base, and an hourly Proof of Reserves is signed with an EIP-191 key whose inputs are public. Anyone can recover the signer, rehash the canonical payload, and check freshness in their own browser at /verify, with no third-party attestor in the path.
The trust boundary you are left with
On the reserve leg, none you cannot check yourself. On the hedge leg, the same kind everyone here has, and more concentrated on one axis: our short runs on Hyperliquid, a single venue, self-reported and bound to a signature, not independently attested. That single-venue hedge is our attestation-equivalent trust boundary, and we state it first, not last. An independent attestation of it is being scoped and is not yet live.
Stage and scale
Genesis scale, deliberately small, with one completed external audit: Hexens published its final report on 31 July 2026, and the deployed vault runs earlier bytecode than the reviewed commit, so that report's findings stand open on the live vault and deposits into it are closed. The published skUSD yield is a live model on the deployed basis, near 3 percent as of 24 July 2026, not a large realized distribution, and the PSM prices USDC at 1:1 with no depeg oracle on that leg. Every one of these limits is listed rather than hidden at /legible. We win one leg by construction and tie the field on the other, and both are on this page.
Why this is the axis, not the scale.
Four of these five publish a reserve figure through a third party you have to trust: an auditor for Falcon, an oracle and a data-verification partner for Axis, a custodian-attestation stack for Ethena, and, when it ships, whatever surface Open USD builds. These are good verifiers. The point is structural, not a knock: in each case the party that actually looks at the accounts is the attestor, not you, and the proof you get is a figure you read rather than one you reproduce.
Recomputation is not a better attestor. It is a different thing. To let a holder recompute, the reserve has to live on-chain where it can be read raw, and the proof of it has to be signed from public inputs so the holder can reproduce the result. A protocol whose backing sits in off-exchange custody can publish a beautiful zero-knowledge attestation and still, correctly, answer no to that last column, because the underlying accounts were never yours to read. That is why a rival cannot move its own cell by hiring another auditor; it would have to rebuild on a signed, on-chain, self-recomputable reserve. The distinction is methodology, not sincerity or size: read-and-trust versus read-and-re-derive.
It matters more, not less, as the field matures. The institutional default is converging on Chainlink Proof of Reserves as table stakes, and that genuinely raises the floor of trust. But a Proof of Reserves feed is still a value an oracle network publishes after reading balances you cannot see. It does not hand you the ability to recompute the reserve with no third party in the path. As more of the field adopts attested Proof of Reserves, that is the line that still separates a dollar you can check from a dollar someone checks for you.
Where we land in the same place as everyone.
This page would be dishonest if it stopped at the reserve leg, because there is a second leg where Kerne has no advantage at all. Every delta-neutral dollar here, Kerne included, hedges its collateral with a short position that lives off-chain, on exchanges or in off-exchange custody, and that leg reaches you as a reported or attested figure, never as data you re-derive. On this leg Kerne is not ahead. Our hedge runs on Hyperliquid, a single venue, self-reported and bound to a signature rather than independently attested, which is more concentrated than the larger names spread across several exchanges, not less. An independent attestation of that leg is being scoped and is not yet live.
So the honest summary is narrow and we will say it plainly: Kerne wins exactly one leg, the reserve, and it earns that by letting you recompute rather than asking you to trust. On the hedge leg it ties the field, and on scale, audit status and realized yield it trails the incumbents. All of that is listed at /legible and ranked against the field, including where we do not lead, in the synthetic-dollar scorecard.
Check any of this yourself.
The whole argument is that you should not take our word for the table above either. Every row resolves to something you can open without our permission.
- Verify Any Stablecoin: paste any Base or Ethereum stablecoin address and read its live on-chain supply, plus an honest split of what is self-verifiable on-chain and what rests on an attestor.
- /verify: paste Kerne's signed Proof of Reserves, or any signed attestation, and recover the signer, rehash the payload and check freshness entirely in your own browser.
- /api/por/signed: the hourly signed Proof of Reserves itself, with on-chain assets, the reported hedge equity, the solvency ratio and a signature you can check against the published signer.
- The scorecard: the same axis applied to the full eleven-name field, with each protocol's real attestor named.
Dispute a claim, or move your cell to yes.
This is a maintained, dated comparison, not a one-off, and its power is that every cell is checkable. If you run one of the protocols here and a detail is wrong, an attestor is misnamed, a method has changed, a token has shipped, tell us and we will correct it quickly and note the date. We would rather be accurate than first, and the bar is the same for everyone and public.
If a cell is factually wrong
Send the on-chain address or the documentation link and we will re-read it and fix it, with a correction date. Attestation is a legitimate model; we describe it, we do not grade the team behind it.
If you want to answer the last column yes
The recipe is architectural, the same one Kerne had to meet: publish raw on-chain reserves a holder can read directly, plus a proof they can re-derive from public inputs with no third party in the path. Ship that, point us at the live surface, and we update the cell from your endpoints, not from a claim.
Next steps.
If a synthetic dollar whose reserve leg you can recompute yourself on Base is what you are after, the next step is to hold the dollar you can check, with its limits named on the same page.
Sources.
Each model is drawn from the protocol's own materials and the named attestor, cross-verified on July 6, 2026. The structural trust model is evergreen; the current-state details (Axis pre-launch, Open USD unshipped, the GENIUS rulemaking status) age and are re-checked before each update.
- Falcon Finance (USDf / fUSD): Falcon's transparency dashboard and the DL News report on the USDf reserve breakdown and the HT Digital (Harris and Trotter affiliated) weekly attestations and ISAE 3000 reports, and The Block on the May 27, 2026 launch of fUSD with Anchorage Digital Bank custody and monthly Deloitte attestation. USDf and fUSD are distinct products with distinct attestors.
- Axis (USDx / sUSDx): the Axis site for the Chainlink, Accountable, Zellic and Fireblocks / Fordefi / Copper / Ceffu stack, The Block and The Cryptonomist on the 5 million dollar Galaxy Ventures-led round of December 2025, and CoinGecko, which shows USDx deployed but not yet tradeable as of early July 2026. The tradeable CoinGecko token ticker USDX is Kava's unrelated token, not Axis.
- Open USD (OUSD, Open Standard): Open Standard's own announcement and website (the single-sentence reserve disclosure quoted as read in early July 2026), American Banker and Fortune on the consortium, and independent commentary on the undisclosed reserve surface. OUSD is also the long-standing ticker of Origin Dollar, an unrelated token.
- Ethena (USDe / sUSDe): the Ethena docs on custodian attestations, Chaos Labs' Edge Proof of Reserves oracle writeup, Kraken on formalizing as an Ethena custodian (January 2026), and public trackers including DefiLlama and CoinGecko for the roughly 4.4 billion dollar supply.
- GENIUS Act: the enacted text on Congress.gov (Public Law 119-27, signed July 18, 2025), the OCC's proposed rule published in the Federal Register on March 2, 2026 (the rebuttable presumption is an OCC construct, not statutory text), and the Chapman and Cutler GENIUS Act rulemaking tracker, which shows the implementing rules still in proposed form as of late June 2026. Section 4(a)(11) is the holder yield prohibition.
- Kerne (kUSD / skUSD): resolves to live endpoints, not reporting, at /api/por/signed, /api/por, /api/risk-status, /api/apy, the in-browser /verify tool, and the kUSD contract on Base at 0x5C2EfdF0D8D286959b42308966bc2B97f5680AA3.
Related reading: the Stablecoin Reserve Recomputation Report, our findings from recomputing the whole field, the full synthetic-dollar scorecard, the field survey Who actually verifies the synthetic dollars, the live Falcon USDf walk, the Ethena BaFin and BlackRock piece, and why the dollars that collapsed all failed in the same place.
Page last verified: July 6, 2026. The trust models are structural and evergreen; each protocol's current state ages, so verify at the canonical sources above. Kerne is not affiliated with Falcon Finance, Axis, Open Standard, Open USD, Ethena Labs, Deloitte, HT Digital, Harris and Trotter, Anchorage Digital, Chainlink, Accountable, Chaos Labs, Zellic, Galaxy Ventures, Origin Protocol, or any other named party. Nothing here is financial or legal advice, nor a claim that any named protocol is under-backed or non-compliant.