linera dynamic template

A production-ready Next.js template for building Linera blockchain dApps with Dynamic wallet auth and WASM smart contracts. Start building in minutes!

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Inspiration

Building decentralized applications on Linera blockchain requires complex setup - configuring SharedArrayBuffer support, WASM compilation, wallet integration, and cross-origin policies. I wanted to eliminate this friction and let developers focus on building their dApps instead of fighting configuration.

What it does

Linera Dynamic Template is a production-ready Next.js 16 starter template that provides:

  • 🔐 Dynamic wallet authentication - Easy login with MetaMask and other wallets
  • ⛓️ Linera blockchain integration - Pre-configured client adapter for chain interaction
  • 📦 Example counter smart contract - Rust/WASM contract demonstrating the full workflow
  • 🛠️ CLI scripts - Wallet initialization, contract deployment, and interaction tools
  • ⚡ Modern stack - Next.js 16, React 19, Tailwind CSS, TypeScript

How I built it

  1. Created a modular Linera adapter library that handles wallet creation, chain claiming, and application queries
  2. Implemented a DynamicSigner class that bridges Dynamic's wallet SDK with Linera's signing requirements
  3. Configured COOP/COEP headers in Next.js for SharedArrayBuffer support (required for WASM)
  4. Built an example counter contract in Rust with cross-chain sync capabilities
  5. Added CLI scripts using tsx for wallet and contract management

Challenges I ran into

  • SharedArrayBuffer requirements: Linera's WASM client needs specific cross-origin headers. Configuring Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy correctly took experimentation.
  • SSR bundling issues: Next.js 16 with Turbopack tried to bundle browser-only packages during SSR. Solved with dynamic imports and ssr: false.
  • Wallet integration: Bridging Dynamic's Ethereum wallet signing with Linera's custom signer interface required careful type handling.

What I learned

  • Linera's microchain architecture enables unique scalability patterns where each user can have their own chain
  • Proper COOP/COEP headers are essential for WASM execution in browsers
  • Dynamic imports in Next.js are crucial for browser-only dependencies

What's next

  • More contract templates (NFT, token, governance)
  • Multi-chain deployment scripts
  • Improved developer tooling and documentation
  • Integration with more wallet providers

Built With

  • linera
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