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op-revm is the Optimism variant of revm — the OP Stack’s modifications to the Ethereum Virtual Machine, packaged as a custom EVM built on top of the upstream revm framework.

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Features

op-revm extends revm with everything the OP Stack needs on top of vanilla Ethereum execution:
  • Deposit transactions — the L1-to-L2 deposit transaction type and its execution semantics.
  • L1 cost accounting — L1BlockInfo and per-transaction L1 fee / blob fee calculation.
  • Operator fees — operator fee handling introduced in Isthmus and refined in Jovian.
  • OP-specific precompiles — including accelerated BN254 pairing.
  • OP halt reasons & transaction errors — OP Stack–specific execution failure modes.
  • Hardfork-aware spec selection — OpSpecId selects the right behavior for each OP Stack hardfork (Bedrock, Regolith, Canyon, Ecotone, Fjord, Granite, Holocene, Isthmus, Jovian, …).

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Provenance

op-revm is vendored from upstream bluealloy/revm’s crates/op-revm and imported into the monorepo so it can evolve in lock-step with the rest of the OP Stack Rust code. The upstream release history is preserved in rust/op-revm/CHANGELOG.md.

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Crate features

The crate exposes the usual revm feature knobs, forwarded through to the underlying revm crate:
  • default = ["std", "c-kzg", "secp256k1", "portable", "blst"]
  • std — enables std-dependent code paths in revm, alloy-primitives, serde_json, etc.
  • serde — derives serde impls and forwards to revm/serde and alloy-primitives/serde.
  • portable, c-kzg, secp256k1, blst, bn — pass-through feature gates for the cryptographic backends.
  • dev, memory_limit, optional_balance_check, optional_block_gas_limit, optional_eip3541, optional_eip3607, optional_no_base_fee, optional_fee_charge — debugging and testing knobs forwarded to revm.
op-revm supports no_std builds: disabling default features (or building with --no-default-features) produces a crate suitable for fault-proof and zkVM targets such as riscv32imac-unknown-none-elf.

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Building & testing

From the rust/ workspace root: 
# Build
cargo build -p op-revm

# Run tests with all features
cargo nextest run -p op-revm --all-features

# no_std check (mirrors upstream's riscv32imac CI)
cargo build -p op-revm \
  --target riscv32imac-unknown-none-elf \
  --no-default-features
The no_std build is also exercised by just check-no-std and runs in CI on every PR that touches rust/**.

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Using op-revm

op-revm is the EVM used by op-reth for OP Stack block execution, and by Kona inside the fault-proof program and rollup node. Most users will consume it transitively through one of those components rather than depending on it directly; depend on op-revm directly only when building a custom OP Stack execution environment (for example, an alternate client or a zkVM proof backend).

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License

op-revm is licensed under the MIT License — see rust/op-revm/LICENSE.