How to Build a Confidential OTC Settlement Protocol Using Oasis Sapphire and Base

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A new developer tutorial on DEV Community walks through building a privacy-preserving over-the-counter trading protocol for large cryptocurrency transactions. The protocol combines confidential smart contract execution on Oasis Sapphire with transparent on-chain settlement on Base, an Ethereum Layer 2 network. It addresses a core challenge in decentralized finance: large trades executed through public liquidity pools expose sensitive order information to arbitrage bots and market participants, distorting prices. Oasis Sapphire enables confidential negotiation between counterparties directly within an EVM-compatible environment using standard Solidity code, keeping deal terms private until settlement. The tutorial covers key features including encrypted trade offers, private counterparty quotes, asset escrow, replay-attack prevention, and safe order cancellation.

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