The Society for Worldwide Interbank Financial Telecommunications (SWIFT) — the staid gatekeeper connecting over 11,000 financial institutions across 200+ countries — is quietly testing the waters of decentralized finance (DeFi). According to a report by The Big Whale, SWIFT has launched an onchain messaging experiment with Ethereum layer two (L2) network Linea, involving major global banks including BNP Paribas and BNY Mellon.
The Technology: ZK-Rollups for Bank-Grade Settlements
Linea, an Ethereum L2 built by Consensys, uses zero-knowledge rollup (zk-rollup) technology to batch transactions off-chain and submit succinct cryptographic proofs to Ethereum mainnet. This design drastically reduces gas fees and network congestion while inheriting the security of Ethereum. In SWIFT’s trial, the zk-rollup layer is being used to test whether interbank messaging can be executed onchain with the speed and finality required for real-time gross settlement (RTGS).
A source familiar with the project, speaking on condition of anonymity, told The Big Whale: “The project will take several months to materialize, but it promises an important technological transformation for the international interbank payments industry.” The source added that the current phase is a proof-of-concept focusing on message reliability, settlement speed, and compatibility with existing bank backend systems.
Why This Matters: SWIFT’s First Real Onchain Move
SWIFT has experimented with blockchain concepts before — most notably through its 2022 collaboration with Chainlink for cross-chain tokenized asset settlement. However, this Linea trial marks the first time the messaging cooperative has integrated an Ethereum L2 into its actual operational messaging flow. If successful, interbank cross-border payments could shift from T+1 or slower cycles to near-instant settlement, while significantly reducing intermediary costs associated with nostro-vostro accounts and correspondent banking.
Yet the path is fraught with challenges. Regulators demand full transaction traceability and anti-money laundering (AML) compliance — requirements that clash with the pseudonymous nature of public blockchains. While Linea’s zk-rollup can offer privacy through zero-knowledge proofs, regulators may insist on audit keys or selective transparency. Moreover, Ethereum’s decentralized validator set introduces governance and finality risks that central banks are unaccustomed to.
Some industry observers believe SWIFT will pursue a hybrid model — using onchain settlement only for low-risk, high-volume payments (e.g., retail cross-border transfers) while keeping core messaging on its traditional network. This approach would minimize disruption while gradually building trust in the technology.
Institutional Shifts: From Exploration to Implementation
SWIFT is not alone in this move. JPMorgan’s JPM Coin, the Monetary Authority of Singapore’s Project Ubin, and recent trials by HSBC and Standard Chartered all point to a broader institutional appetite for blockchain-based payments. Consensys’ Linea specifically appeals to banks due to its enterprise-grade tooling (MetaMask, Infura) and strong developer community.
If the SWIFT-Linea experiment progresses to production, it could unlock a domino effect: more banks evaluating Ethereum L2s as payment rails; increased total value locked (TVL) on Linea; and the emergence of new DeFi-TradFi hybrid services, such as automated liquidity management, onchain forex hedging, and programmable payments triggered by smart contracts.
Regardless of the final outcome, one thing is clear: the lines between legacy infrastructure and decentralized rails are blurring faster than most expected. SWIFT’s cautious step into the onchain pool represents not just a technical test, but a strategic signal that the banking industry is ready to touch — if not fully embrace — the future of finance.