Chain forking creates a local copy of a live blockchain network. Your local environment gets the complete state of the target network — all contracts, all balances, all storage — at a specific block. This lets you:
Test against real DeFi protocols — Interact with Uniswap, Aave, Compound, etc. locally
Reproduce mainnet bugs — Fork at the block before a bug and replay the transaction
Test token integrations — Use real USDC, WETH, DAI balances in your tests
Simulate governance — Impersonate any address and execute transactions
# Start your environmentdokrypt up# Fork Ethereum mainnet at the latest blockdokrypt fork mainnet# Fork at a specific blockdokrypt fork mainnet --block 18500000# Fork Polygondokrypt fork polygon
# Fork mainnetdokrypt fork mainnet# Your local chain now has all of Uniswap's contracts# Interact with the Router at 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
# Fork mainnetdokrypt fork mainnet# Impersonate a USDC whaledokrypt accounts impersonate 0x47ac0Fb4F2D84898e4D9E7b4DaB3C24507a6D503# Now you can send USDC from this address without the private key
# Fork at the block just before the bugdokrypt fork mainnet --block 17999999# Impersonate the affected accountdokrypt accounts impersonate 0xAffectedAddress...# Replay or investigate
Resolution — The network name is resolved to an RPC URL
Reset — anvil_reset (or hardhat_reset) is called with the fork configuration
Wait — Dokrypt waits up to 120 seconds for the fork to complete
Funding — Test accounts are funded with 10,000 ETH each
Ready — The local chain is now a fork of the target network
Forking from public RPCs can be slow. For production testing, use a dedicated RPC provider (Alchemy, Infura, QuickNode) for much faster fork times.
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