AI subject tested: Claude Sonnet 4.6 (web search on)
Question (paraphrased): A payment processor issues a stablecoin backed by reserves at an OCC-chartered national trust bank. Which CFTC staff letter is operative for FCM margin acceptance of payment stablecoins, what revision to the stablecoin issuer definition did that letter introduce, and what specific regulatory instrument provides the eligibility hook for national trust bank issuers?
AI response:
"The sole substantive change was a targeted amendment to the payment stablecoin definition to add national trust banks chartered under federal law (OCC-chartered institutions) as a permitted issuer category — a category Staff Letter 25-40 had not explicitly included."
Regulator verbatim text:
"The OCC Interpretive Letter 1183 provides the hook for national trust bank eligibility."
Failure mode: misstated_rule
Substrate document: p_03_NOTICE_CFTC_Staff_Letter_26_05__February_6__202_download.pdf
This finding documents a confirmed hallucination by Claude Sonnet 4.6 (web search on) on a probe of the regulation. The model's response was tested against the regulator's verbatim primary text and classified as misstated_rule. Full per-finding context is available via the linked Citation ID.
Each finding has a stable Citation ID (RLB-F-… for aggregated case-study findings, RLB-H-… for raw per-model hallucinations) — like a DOI, the ID always resolves to the canonical finding even if URLs change.
RegLeg Specialist Panel (2026). "A payment processor issues a stablecoin backed by reserves at an OCC-chartered national trust bank — AI Labs." Citation ID: RLB-H-US-CFTC-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-Q005-Sonnet46. RegLegBrief AI Hallucination Research, published 2026-06-07. https://reglegbrief.com/regulators/j3/US/CFTC/DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025/whitepaper/finding/US-CFTC-US-001-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-v1-005--sonnet-46-websearch/
RegLeg Specialist Panel. (2026). A payment processor issues a stablecoin backed by reserves at an OCC-chartered national trust bank [Hallucination finding RLB-H-US-CFTC-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-Q005-Sonnet46]. RegLegBrief AI Hallucination Research. https://reglegbrief.com/regulators/j3/US/CFTC/DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025/whitepaper/finding/US-CFTC-US-001-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-v1-005--sonnet-46-websearch/
RegLeg Specialist Panel, A payment processor issues a stablecoin backed by reserves at an OCC-chartered national trust bank [RLB-H-US-CFTC-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-Q005-Sonnet46], RegLegBrief AI Hallucination Research (June 07, 2026), https://reglegbrief.com/regulators/j3/US/CFTC/DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025/whitepaper/finding/US-CFTC-US-001-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-v1-005--sonnet-46-websearch/.
@misc{reglegbrief_RLB_H_US_CFTC_DIGITAL_ASSET_COLLATERAL_TOKENIZED_ASSETS_STAFF_GUIDANCE_2025_Q005_Sonnet46,
author = {RegLeg Specialist Panel},
title = {A payment processor issues a stablecoin backed by reserves at an OCC-chartered national trust bank},
year = {2026},
publisher = {RegLegBrief AI Hallucination Research},
note = {Hallucination finding Citation ID: RLB-H-US-CFTC-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-Q005-Sonnet46},
url = {https://reglegbrief.com/regulators/j3/US/CFTC/DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025/whitepaper/finding/US-CFTC-US-001-DIGITAL-ASSET-COLLATERAL-TOKENIZED-ASSETS-STAFF-GUIDANCE-2025-v1-005--sonnet-46-websearch/}
}
Every finding on this page compares an AI subject's account of the rule against the regulator's verbatim text from the regulator's own portal. Both are linked. Each delta, its root causes, and impact analysis are documented and published with immutable Citation IDs.