Sebastien Rousseau
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Sebastien Rousseau

Articles on AI, post-quantum cryptography, ISO 20022 and the future of payments.

TOPIC

ISO 20022 & Payments

Cross-border message migration, structured-address compliance, SEPA Instant, SWIFT gpi, and the wholesale-payments rails carrying it all. Tools, playbooks, and the regulatory clock.

BlackRock tokenised money market fund architecture diagram — BRSRV OnChain Shares and BSTBL ERC-20 share class with GENIUS Act reserve flows
Blackrock · Brsrv · Bstbl

Stablecoin Yield by Another Name: BlackRock's BRSRV and BSTBL Filings Decoded

· Sebastien Rousseau

Stablecoins cannot pay yield under the GENIUS Act. On 8 May 2026, BlackRock filed two SEC registrations for products that solve this constraint by being regulated as money market funds rather than stablecoins — while behaving, in the wallet, like yield-bearing dollars. A close reading of BRSRV, BSTBL, and the OCC rulemaking they respond to.

ISO 20022 pacs.008 structured address diagram — cross-border payment message fields with TwnNm and Ctry highlighted
Iso 20022 · Pacs.008 · Swift Cbpr+

The November 2026 pacs.008 Structured-Address Deadline: A Six-Month View

· Sebastien Rousseau

From November 2026, SWIFT CBPR+ requires structured postal addresses in cross-border payment messages. Unstructured address lines (AdrLine alone) will no longer be accepted for key party fields in pacs.008. At minimum, TwnNm and Ctry are required, with StrtNm and BldgNb or PstBx recommended. With six months to go, 65% of payment messages still contain unstructured addresses and 44% of banks remain behind schedule.

Quantum computing circuit board in blue light
Quantum-Safe Payments · Post-Quantum Cryptography · Sepa

Quantum-Safe Payments: Why the Industry Must Act Now

· Sebastien Rousseau

Quantum computing threatens payment system cryptography. The EPAA white paper outlines the structural risk and the urgent case for PQC migration.

Turned off laptop computer on top of brown wooden table
Pain001 · Iso 20022 · Payment Automation

Automating ISO 20022 Payment Files Creation with Pain001

· Sebastien Rousseau

Automate the creation of ISO 20022 pain.001 payment files from CSV or SQLite. pain001 is the open-source Python library that streamlines compliance.

Giant white pillars
Mathematical Constants · Cryptographic Constants · Rust

The making of the Express Transaction Credits Platform

· Sebastien Rousseau

Developing a comprehensive framework for the next generation of Ethereum Request for Comment compliant tokens using the ERC-223 standard.