Ethena USDtb

Rejected venues wait the longest for re-review; a rejection has to earn another look before the scheduled date.

REJECTED ON AN UNRESOLVED ELIGIBILITY QUESTION AND UNDISCLOSED CONTROL MECHANICS, NOT A CLEAR ACCESS BAR. USDtb is materially a wrapper on BlackRock BUIDL — described at launch as backed over 90% by BUIDL plus a stablecoin reserve for redemption liquidity — and BUIDL is already rejected in this registry on qualified-purchaser access grounds. The issuer itself changed structurally in October 2025: issuance, redemption, and reserve management moved from an offshore BVI/Cayman entity (Pallas) to Anchorage Digital Bank, N.A., an OCC-chartered federally regulated digital-asset bank, with US Bank custodying the non-BUIDL reserve portion. That is a genuine step toward a more US-regulated structure, but it creates a live, unresolved conflict this review could not settle: Ethena’s general application interface has historically excluded US users, while Anchorage is itself a US OCC bank now running wire and SWIFT-based mint and redeem — it is not established which rule now governs US-person access. Redemption minimums and fees are undisclosed in every source reviewed, and no source confirmed whether the USDtb contract carries an issuer-side freeze or blacklist function. Until eligibility and control are affirmatively confirmed, this stays rejected rather than assumed accessible.

Kill criteria: the events that revoke this verdict
• US-person eligibility for direct USDtb minting and redemption is affirmatively confirmed under the current Anchorage-issued structure
• Minimum investment size and fee schedule are publicly disclosed
• The USDtb contract’s freeze or blacklist mechanics, or their absence, are confirmed from primary contract source
• Current reserve composition (BUIDL versus cash and other holdings) is disclosed at a specific, dated percentage

The research file

Mechanism and the BUIDL pass-through

USDtb launched 2024-12-16 backed over 90% by BlackRock’s BUIDL fund, with the remainder held in stablecoins and other tokenized Treasury products for redemption liquidity. A June 2025 Securitize/Ethena announcement stated Ethena Labs had stopped making additional allocations toward the 90% BUIDL target; current documentation describes USDtb as backed by tokenized Treasury fund products plus a stablecoin reserve without disclosing a current percentage split. Because USDtb’s underlying collateral is substantially BUIDL, any BUIDL-level transfer restriction, redemption gate, or freeze — Securitize as BUIDL’s transfer agent retains authority to restrict, freeze, revoke, or reissue shares — could impair the issuer’s own ability to redeem USDtb even without touching an individual holder’s wallet directly. No source found addressed this cascade scenario for USDtb specifically.

The October 2025 issuer transition

At launch the issuer was Pallas (BVI) Ltd, with Pallas Foundation as the Cayman operating entity and Ethena Labs as service provider. As of 2025-10-13/15, issuance and reserve management transitioned to Anchorage Digital Bank, N.A., described as ”America’s first federally regulated digital asset bank” and now the sole issuer; US Bank was selected in October 2025 to custody the non-BUIDL portion of reserves. Anchorage frames USDtb’s compliance regime around the GENIUS Act’s stablecoin issuance and reserve framework. This is a real upgrade in issuer regulatory quality relative to the offshore Pallas structure, but the precise OCC charter classification was not independently confirmed.

The unresolved eligibility conflict

Pre-transition Ethena documentation stated US users could not access the Ethena application. Post-transition, Anchorage — a US OCC-chartered bank — runs wire and SWIFT-based mint and redeem for onboarded institutional users with typical settlement around 15 minutes, which is difficult to square with a continued blanket US-person exclusion. No source reviewed directly resolved which rule now governs, and no minimum investment or fee schedule for direct minting or redemption was found in any source. Separately, a ”USDtb Liquidity Fund” contract (announced 2025-06-18) allows 24/7 atomic swaps between BUIDL and USDtb, but only for Securitize-qualified users — i.e., BUIDL’s own qualified-purchaser-gated base, not a broader eligibility path.

Control

No source reviewed confirmed or refuted whether the USDtb ERC-20 contract carries an issuer-side freeze or blacklist function comparable to USDT’s well-documented addBlackList capability. This needs direct on-chain contract verification before any future approval. What is documented is that non-whitelisted holders are limited to secondary-market exit at prevailing price rather than issuer par redemption — the same permissioned-stablecoin pattern already found in BUIDL and USYC.

Track record and parent-entity context

No USDtb-specific depeg or operational incident was found; pre-launch audits by Pashov, Quantstamp, and Cyfrin reported no high or medium findings. Ethena Labs’ separate synthetic-dollar product, USDe, traded down to $0.65 on Binance for roughly 90 minutes during the 2025-10-11 crypto liquidation cascade, attributed to a thin-order-book Binance internal oracle rather than a collateral failure — USDe reportedly held near $1 on primary venues throughout and Ethena processed over $2B in redemptions within 24 hours without delay. USDtb’s Treasury/BUIDL-backed design is not exposed to the same basis-trade mechanism that produced that event, but it is relevant context on the broader Ethena ecosystem’s market-perception and stress-handling history.

Comparison and decision

Against USDC and USDT, USDtb’s direct mint/redeem remains KYC-gated to whitelisted institutional counterparties with genuinely unclear US-person eligibility post-transition, versus USDC/USDT’s open secondary-market access (albeit with their own documented freeze histories). Against holding BUIDL directly, USDtb adds an issuer-credit and operational-risk layer, now Anchorage’s, in exchange for DeFi composability BUIDL itself lacks — but that trade is not evaluable while the underlying eligibility and control questions remain open. Reject stands until US-person access, minimums, fees, and contract-level control are affirmatively confirmed.

Sources

The claims above trace to these. Where a number could not be independently verified, the thesis says so.

• The Block — Ethena’s USDtb stablecoin backed by BlackRock’s BUIDL goes live · secondary · accessed 2026-08-17
  Supports: launch mechanism, original Pallas issuer structure, audit firms
• Anchorage Digital — Anchorage issues USDtb, America’s first federally regulated stablecoin · primary · accessed 2026-08-17
  Supports: October 2025 issuer transition, OCC charter framing, wire and SWIFT settlement
• US Bancorp — US Bank selected to custody Anchorage stablecoin reserves · primary · accessed 2026-08-17
  Supports: reserve custody arrangement
• crypto.news — Ethena Labs, Securitize launch BUIDL-USDtb Liquidity Fund · secondary · accessed 2026-08-17
  Supports: BUIDL allocation status, Liquidity Fund atomic swap, Securitize-qualified user gate
• DefiLlama — Ethena USDtb stablecoin data · secondary · accessed 2026-08-17
  Supports: current market cap
• CCN — Ethena USDe October 2025 depeg analysis · secondary · accessed 2026-08-17
  Supports: USDe stress event, Binance internal oracle root cause, redemption processing during stress

Inherited controls

The verdict above grades the protocol layer. Every position also inherits the asset it holds and the chain it settles on. The least safe layer sets the position’s grade, and the position table names which one that is.