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Smart contracts must be compiled to Zksync VM-compatible bytecode using the zksolc compiler to prepare them for deployment on Abstract.
1

Configure foundry.toml

Update your foundry.toml file to include the following options:
[profile.default]
src = 'src'
libs = ['lib']
fallback_oz = true
is_system = false # Note: NonceHolder and the ContractDeployer system contracts can only be called with a special is_system flag as true
mode = "3"

[etherscan]
abstractTestnet = { chain = "11124", url = "https://api-sepolia.abscan.org/api", key = "TACK2D1RGYX9U7MC31SZWWQ7FCWRYQ96AD"}
abstractMainnet = { chain = "2741", url = "https://api.abscan.org/api", key = ""}
2

Compile contracts

Compile your contracts using the following command:
forge build --zksync
This will generate the zkout directory containing the compiled smart contracts.