# The Technical Architecture of Cross-Chain DeFi I Anton Bukov

- Channel: [ETHGlobal](https://streameth.org/ethglobal)
- Date: 2025-10-09
- Duration: 18:22
- Topics: 1inch Network, Anton Bukov, cross-chain DeFi architecture, limit order protocol, Dutch auctions DeFi, 1inch Fusion, Fusion+, atomic swaps, HTLC, escrow contracts, predicates smart contracts, dynamic pricing DeFi, self-custody crypto, cross-chain swaps, interoperability blockchain, Bitcoin DeFi, UTXO model vs EVM, decentralized exchanges, DeFi protocols, crypto liquidity, price discovery mechanisms, Ethereum layer 2, 1inch protocol tutorial, decentralized finance 2025
- Watch: https://streameth.org/watch/yt-Vq7ziA9Yd5w
- YouTube: https://www.youtube.com/watch?v=Vq7ziA9Yd5w

## Description

Anton Bukov, co-founder of 1inch, delivers a deep dive into the technical architecture powering the future of cross-chain DeFi. He outlines the three-layered design behind 1inch’s system: the Limit Order Protocol, Fusion for price discovery via Dutch auctions, and Fusion+ for atomic swaps with escrow and HTLCs. This framework enables users to trade across blockchains in a self-custodial, permissionless, and efficient way.

Anton explains how the Limit Order Protocol leverages digital signatures, predicates, interactions, and dynamic pricing to create flexible orders with advanced conditions like stop-loss triggers or oracle-based rules. He then explores how Dutch auctions drive competitive price discovery and deliver better execution than traditional market orders. Fusion+ takes it a step further, enabling secure cross-chain swaps using hashed secrets and time-locked contracts—unlocking self-custody at the architectural level.

The talk also examines the challenges of working across diverse blockchain ecosystems, from EVM-compatible networks to Bitcoin’s UTXO model. Anton highlights how Bitcoin’s limited opcodes constrain DeFi innovation but still support atomic swaps and payment channels, while EVM-based chains allow far greater flexibility. He emphasizes the importance of building truly permissionless, non-custodial systems as the foundation for long-term decentralized finance.

By dissecting real-world examples, including multi-million dollar swaps, Anton demonstrates how this architecture improves efficiency, minimizes risks, and creates opportunities for cross-chain DeFi at scale. This session is a must-watch for developers, researchers, and builders eager to understand the mechanics behind next-generation decentralized finance.

00:00 – Introduction & session overview
00:35 – 1inch cross-chain architecture: three layers explained
01:04 – Limit Order Protocol overview (signatures, off-chain orders)
02:38 – Predicates & advanced order conditions (stop-loss, oracle checks)
03:34 – Dynamic pricing, interactions & smart order design
04:55 – Fusion: Dutch auctions for price discovery
05:51 – Real-world example: $13M USDT → ETH swap with surplus
06:36 – Fusion+: atomic swaps, escrows & HTLCs
08:07 – Cross-chain order flow & hashed secrets
09:48 – Adapting to different chains (EVM vs Bitcoin UTXO model)
11:19 – Why atomic swaps are key for self-custody
13:32 – Challenges integrating Bitcoin into DeFi
15:13 – Layer 2 differences: EVM vs Bitcoin
16:14 – Payment channels & Lightning vs broader DeFi
17:24 – Multi-chain development complexity & hacker opportunities
18:14 – Closing thoughts & Q&A

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*Unite Defi 2025*
This ceremony was part of Unite DeFi 2025, an online hackathon sponsored by 1inch and held from July 25 to August 8. It brought together the world’s most talented Web3 developers, designers, and product builders to advance the Ethereum ecosystem! Watch the full Unite Defi 2025 playlist here: https://www.youtube.com/playlist?list=PLXzKMXK2aHh4YsK81x2echSjHDRQD09oJ

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