What’s Oasis Sapphire?
Oasis Sapphire is the first production-ready confidential EVM-compatible ParaTime on the Oasis Network. It lets developers build smart contracts that are not just decentralized and scalable, but also private by design.
End-to-end encrypted state
Confidential randomness
Full EVM compatibility (Hardhat, MetaMask, Remix)
Why Should You Care?
Smart Privacy: You decide the confidentiality spectrum (public ↔ fully private).
Perfect for privacy-preserving DeFi, auctions, vaults, or even on-chain AI.
Smooth Migration
Already on Ethereum? No need to rewrite everything. Port your Solidity contracts using the same tools you already know: Hardhat, Ethers, MetaMask.
Speed + Cost
~6 second finality
Gas fees more than 99% cheaper than Ethereum
Scalable thanks to multiple ParaTimes running in parallel
Level Up with ROFL
ROFL (Runtime Off-chain Logic) is a framework for secure, verifiable off-chain computation.
Use cases include oracles, AI workloads, and backend services.
Dev Kit Essentials
Docs: https://docs.oasis.io/build/sapphire/
Sapphire-Hardhat plugin for quick setup
Testnet endpoints and faucets to start building
Real-World Example
Oasis Safe (a Gnosis Safe fork) is live on Sapphire: a secure, programmable wallet with confidentiality built in.
Why 2025?
ROFL mainnet is live, enabling confidential + hybrid off-chain apps today
Sapphire 1.0 launched August 2025, a stable and production-ready runtime
Top comments (2)
Sapphire is a big step forward for EVM devs. Confidentiality isn’t just a "nice to have" anymore, it’s becoming core to DeFi, AI, and real-world dApps. Excited to see how builders leverage ROFL + Sapphire to push privacy into the Web3 mainstream!!
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