Learn SIMPLICITY with Real Code Examples
Updated Nov 25, 2025
Practical Examples
2-of-3 multi-signature wallet
Time-locked payment channel
UTXO-based escrow contract
Atomic swap between blockchains
Token issuance on Bitcoin sidechain
Troubleshooting
Check type mismatches
Verify combinator composition
Ensure AST compiles to valid bytecode
Confirm formal verification outputs
Test contract with sandbox transactions
Testing Guide
Unit-test combinators
Verify AST compilation
Check transaction integration with UTXO
Formal verification for correctness proofs
Simulate contract execution on testnet
Deployment Options
UTXO blockchain transaction embedding
Sidechain deployment
Testing via local sandbox
Simulation of contract execution
Integration with wallet and transaction APIs
Tools Ecosystem
Simplicity reference compiler
Simplicity AST visualization tools
Formal verification libraries
UTXO blockchain clients (Bitcoin/Elements)
Simplicity Playground for experiments
Integrations
Bitcoin sidechains and Elements
Transaction scripts for UTXO blockchains
Formal proof assistants
Off-chain verification tools
Wallets supporting serialized bytecode contracts
Productivity Tips
Reuse combinators
Visualize ASTs during development
Keep contracts small and modular
Leverage verification tools
Test extensively on sandbox networks
Challenges
Steep learning curve
Limited documentation
Low-level coding style
Fewer tooling resources
Integrating with UTXO blockchain clients