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IOG software engineer Edmund Judge, a member of IOG's Prototyping team, authored the CANS (Cyclic Atomic N-party Swap) specification, which describes a ring-based settlement system allowing up to 20 participants across multiple blockchains to exchange assets in a single coordinated transaction.

The concept of atomic swaps dates to early Bitcoin research, with foundational proposals from Sergio Demian Lerner in 2012 and Tier Nolan in 2013, and a landmark cross-chain swap between Decred and Litecoin in 2017. What remained unsolved was scaling the mechanism beyond two parties. CANS directly addresses that gap.

If any participant fails to complete their leg of the trade, all honest parties receive their funds back through pre-signed, staggered, time-locked refund transactions.

No money moves until every participant has committed. The research was funded through an Intersect IOR proposal under Work Package 4.1, a program covering bridges, atomic swaps, and agent chains with a total budget of roughly 32.9 million ADA (approximately $7.9 million) across nine academic and research partners including institutions in Edinburgh, Oxford, Tokyo, and Buenos Aires.

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The protocol's technical foundation rests on Bitcoin's Taproot upgrade, activated in November 2021, which added native support for Schnorr signatures (a cryptographic scheme that enables more efficient and flexible transaction verification). CANS exploits this by using a Cardano smart contract written in Plutus to verify Bitcoin Schnorr signatures directly on Cardano's blockchain. That verification capability creates a cryptographic link between the two chains without relying on a third-party custodian or wrapped token.

According to the IOG blog post, CANS transactions are indistinguishable from ordinary transfers to outside observers: "Nothing sensitive appears on-chain. Spend transactions look like ordinary transfers." The safety and liveness properties of the protocol have been formally verified, and a reference implementation is available in Rust. Participants run independent software daemons that communicate over standard TCP networking. CANS is currently a prototype and has not been deployed to Cardano's mainnet.

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The dominant existing method for bringing Bitcoin into DeFi is the wrapped token model. Wrapped Bitcoin (WBTC) holds roughly 132,500 BTC in circulating supply with a market capitalization near $7.3 billion as of early July 2026, but all of that Bitcoin sits in custody with BitGo, a single US-based company. Custodial risk is not hypothetical: Dr. Weijia Zhang of Wanchain, speaking at IOG's Interchains research event, cited more than $2 billion in total losses from bridge exploits historically, including a roughly $290 million attack on Kelp DAO in 2026 attributed to North Korea's Lazarus Group.

Despite Bitcoin's overall market capitalization sitting near $1.25 trillion, only an estimated 0.46 percent of all BTC actively participates in any DeFi activity. That gap represents a significant and growing opportunity: BTCFi total value locked grew from $304 million in January 2024 to over $7 billion by December 2024, a 22-fold increase in twelve months (Bitcoin Foundation). The CANS protocol is positioned to address that opportunity, and the IOG blog post explicitly names trade finance involving simultaneous payments to sellers, shippers, and financiers as a practical use case for N-party settlement. IOG cited $1.7 trillion in annual global trade volume as context for that application.

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The announcement lands during a difficult stretch for Cardano's DeFi ecosystem. On-chain data shows Cardano's total value locked declined from approximately $266 million in July 2025 to roughly $82 million by early July 2026, according to Motley Fool data from July 4, a drop of about 69 percent year over year.

That contraction mirrors a broader DeFi market retreat, with aggregate TVL across all blockchains falling from roughly $115 billion in January 2026 to approximately $70 billion by mid-year. Just days before the CANS publication, Cardano founder Charles Hoskinson warned publicly of "[a coming] wave of failures" among ecosystem applications due to governance and economic pressures, as reported by Motley Fool on July 4, 2026. That same week, the closure of TapTools and other concurrent ecosystem failures added further pressure on Cardano's developer community. CANS arrives as a longer-term infrastructure bet placed against a backdrop of near-term contraction, not as an immediate turnaround signal.

CANS is a research-stage protocol, not a deployed product, and no timeline for production integration has been announced.

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The protocol's regional implications are sharpest in markets where users already rely on Bitcoin as a settlement rail and where custodial intermediaries create regulatory friction. In Sub-Saharan Africa, stablecoins accounted for 43 percent of all digital asset transactions in 2024, driven largely by cross-border payment demand rather than speculative activity. Cardano has approximately 150 Africa-focused projects funded through its Project Catalyst grant program, with roughly $2.5 to $3 million in Catalyst funding distributed to Africa-focused teams, and the Cardano Africa Tech Summit in February 2026 drew more than 500 developers across 12 cities. A trustless BTC settlement layer could reduce dependence on US-incorporated custodians that are subject to OFAC and FinCEN restrictions, which matter directly for users in sanctioned or closely monitored markets.

In South Asia, where India ranked first globally in the Chainalysis 2025 Crypto Adoption Index and Pakistan ranked third, Bitcoin-based remittance flows are significant. Pakistan operates in a high-regulatory-uncertainty environment, and trustless protocols are potentially attractive there precisely because they remove custodians who may face local compliance pressure. India alone receives over $100 billion annually in remittance transfers. Whether CANS reaches these users in practice depends heavily on tooling, documentation, and local developer capacity to build on a formally verified Rust codebase.

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IOG described CANS as compatible with any blockchain that supports Schnorr signatures natively or through a smart contract layer, suggesting potential extension beyond the Bitcoin-Cardano corridor. The Cardinal bridge, a separate IOG project targeting persistent Bitcoin-Cardano connectivity, is designed to remain secure "even if all but one operator behaves maliciously," according to IOG applied cryptography lead Jesús Díaz Vico. CANS and Cardinal address different layers of the interoperability problem and are intended to complement each other. Cardano's 2026 development roadmap had already listed Bitcoin and XRP liquidity as cross-chain priorities before the CANS publication.