# USDtb (USDTB) Quantum Readiness Report

> USDtb has a QRI score of 1.5/100 and is assessed at Stage 1 (Quantum Risk Assessed) with medium evidence confidence.

Evaluation date: 2026-06-06. Review status: draft. Evaluated scope: USDtb ERC-20/OFT stablecoin token including admin keys, minting authority, and LayerZero bridge dependencies.

USDtb is a fiat-backed stablecoin (ERC-20 / LayerZero OFT) issued by Anchorage Digital Bank under the GENIUS Act, with reserves held in BlackRock's BUIDL fund. It has no post-quantum cryptographic protection whatsoever. All spend authorization relies on classical ECDSA (secp256k1 on Ethereum, ed25519 on Solana). The upgradeable contract is controlled by a single ECDSA admin key — now held by Anchorage Digital — whose compromise via quantum attack would enable unlimited minting. Cross-chain transfers depend on LayerZero OFT, which uses classical cryptography for message verification. The project has not published a quantum risk assessment, cryptographic inventory, or post-quantum migration roadmap. Standard Web3 audits confirm general smart contract safety but do not assess quantum resistance. The QRI Score of 1.5 reflects: minimal project-published quantum assessment (Category 1: 0.5/5), no production PQC protection (Category 2: 0/35), negligible value-at-risk coverage (Category 3: 1/25), no migration mechanisms (Category 4: 0/15), and no algorithm assurance (Category 5: 0/20). The score is capped at Stage 1 (Quantum Risk Assessed, max 20) and further by the Readiness & Risk Cap of 20 (no credible mitigation design). The binding constraint is the factor score itself at 1.5.

## Core resources

- [USDtb QRI report](https://qrindex.org/projects/usdtb/): Human-readable assessment with score, stage, evidence, blockers, risks, and assurance notes.
- [USDtb structured report data](https://qrindex.org/projects/usdtb/report.json): Complete report as JSON for deterministic machine processing.
- [QRI methodology](https://qrindex.org/methodology/): Scoring model, evidence handling, readiness stages, confidence, assurance, and report status.
- [All QRI project reports](https://qrindex.org/llms.txt): Score-ranked index of every published project assessment.
- [USDtb official website](https://www.coingecko.com/en/coins/usdtb): Project-maintained website.



## Evidence sources

- [Evidence source 1](<https://docs.usdtb.money/>): Public source cited by the USDtb QRI assessment.
- [Evidence source 2](<https://etherscan.io/token/0xc139190f447e929f090edeb554d95abb8b18ac1c>): Public source cited by the USDtb QRI assessment.
- [Evidence source 3](<https://eternax.ai/>): Public source cited by the USDtb QRI assessment.
- [Evidence source 4](<https://etherscan.io/token/0xc139190f447e929f090edeb554d95abb8b18ac1c#code>): Public source cited by the USDtb QRI assessment.
- [Evidence source 5](<https://github.com/ethena-labs/ethena-usdtb-contest>): Public source cited by the USDtb QRI assessment.
- [Evidence source 6](<https://ethereum.org/roadmap/future-proofing/quantum-resistance/>): Public source cited by the USDtb QRI assessment.
- [Evidence source 7](<https://stablepqc.com/>): Public source cited by the USDtb QRI assessment.
- [Evidence source 8](<https://llamarisk.com/research/insights-usdtb-ownership-changes>): Public source cited by the USDtb QRI assessment.
- [Evidence source 9](<https://www.anchorage.com/insights/anchorage-digital-issues-usdtb-americas-first-federally-regulated-stablecoin>): Public source cited by the USDtb QRI assessment.
- [Evidence source 10](<https://www.coingecko.com/en/coins/usdtb>): Public source cited by the USDtb QRI assessment.
- [Evidence source 11](<https://coinmarketcap.com/currencies/ethena-labs-usdtb/>): Public source cited by the USDtb QRI assessment.