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Dev.to
7/20/2026
Building a Confidential OTC Settlement Protocol with Oasis Sapphire & Base

Building a Confidential OTC Settlement Protocol with Oasis Sapphire & Base

Short summary

A tutorial for building a confidential OTC settlement protocol that uses Oasis Sapphire for private negotiation and Base for transparent settlement. Large crypto trades on public AMMs leak strategy to arbitrage bots and searchers. Sapphire provides confidential smart contract execution within an EVM-compatible environment, allowing counterparties to negotiate privately before settling on-chain. The guide covers offer creation, private quotes, escrow, settlement, and replay attack prevention.

  • •Oasis Sapphire enables confidential EVM smart contract execution for private OTC negotiations
  • •Base handles transparent on-chain settlement after parties agree on price
  • •Protocol includes escrow, order cancellation, and signed-message replay protection

Generated with AI, which can make mistakes.

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