zeekayandHanzo Dev
cce6217b68
TASK 1 — sub-second block rate. TargetBlockRate is uint64 SECONDS and header.Time is Unix seconds; the sole cadence chokepoint was vm.go minNextBuildTime = time.Unix(header.Time+TargetBlockRate, 0) (whole-second). New opt-in config MinBlockBuildInterval (JSON min-block-build-interval, default 0 = disabled) decouples ONLY the block-BUILD cadence from the (unchanged, second-granular) fee window: when set, minNextBuildTime/nextBuildTime pace off sub-second wall-clock. header.Time stays Unix seconds (a consensus-critical geth field); two sub-second blocks may share a second-granular header.Time (EVM-spec-legal, non-decreasing). Unset ⇒ mainnet BYTE-IDENTICAL. The proposervm above supplies sub-second ordering via UnixMilli (node v1.36.19). TASK 2 — parallel EVM backend fail-closed. The per-tx cevm/revm executors returned (nil,nil) stubs and the old guard SILENTLY fell through to the Go EVM — an operator selecting revm/cevm unknowingly ran geth. New CheckTxResult errors the block instead of silently degrading; SetBackend rejects unregistered backends; RegisterExecutor documents the consensus-safety invariant (an executor MUST commit to the canonical StateDB — the Go BlockSTMExecutor does not, so it stays unregistered → no fork). revm/cevm remain build-tag-gated stubs; NONE is or can silently become the default execution path (the parallel==serial determinism gate is unmet). Go serial EVM stays default. Cryptographer-reviewed (adversarial): SAFE TO PUBLISH — default-unset = mainnet byte-identical and no-silent-nondeterministic-execution both verified from code; fee math under same-second blocks has no base-fee collapse, no consensus split, no overflow. One MEDIUM (evm_setBackend stub-halt) applies ONLY to -tags revm/cevm GPU-accel builds (inert for the mainnet pure-Go image) — fast-follow: don't register non-executable stubs. Tests green (pacing, fail-closed selection, config). Co-authored-by: Hanzo Dev <[email protected]>
Lux EVM
Lux is a network composed of multiple blockchains. Each blockchain is an instance of a Virtual Machine (VM), much like an object in an object-oriented language is an instance of a class. That is, the VM defines the behavior of the blockchain.
Lux EVM is the unified Virtual Machine (VM) that powers both the C-Chain and L1/L2 Subnet EVM chains. This package consolidates the former Coreth (C-Chain) and Subnet EVM codebases into a single implementation.
Note
: The
github.com/luxfi/corethrepository has been deprecated and merged here. See the migration guide below.
This chain implements the Ethereum Virtual Machine and supports Solidity smart contracts as well as most other Ethereum client functionality.
Building
The Subnet EVM runs in a separate process from the main Luxd process and communicates with it over a local ZAP-native connection (LP-186 wire schema, no protobuf, no gRPC).
Luxd Compatibility
[v0.7.0] [email protected] (Protocol Version: 38)
[v0.7.1] [email protected] (Protocol Version: 39)
[v0.7.2] [email protected]/1.13.0-testnet (Protocol Version: 39)
[v0.7.3] [email protected]/1.13.0 (Protocol Version: 39)
[v0.7.4] [email protected] (Protocol Version: 40)
[v0.7.5] [email protected] (Protocol Version: 41)
[v0.7.6] [email protected] (Protocol Version: 42)
[v0.7.7] [email protected] (Protocol Version: 42)
API
The Subnet EVM supports the following API namespaces:
ethpersonaltxpooldebug
Only the eth namespace is enabled by default.
Full documentation for the C-Chain's API can be found here.
Compatibility
The Subnet EVM is compatible with almost all Ethereum tooling, including Remix, Metamask, and Foundry.
C-Chain vs Subnet EVM Mode
This unified EVM package supports both modes:
C-Chain Mode (Primary Network):
- Atomic transactions for cross-chain transfers (X-Chain ↔ C-Chain)
- Shared memory integration
- Primary network consensus
Subnet EVM Mode (L1/L2 Subnets):
- Configurable fees and gas limits in genesis
- Simplified hardfork configuration
- No atomic transactions (cross-chain via Warp messaging)
Migrating from Coreth
If you were using github.com/luxfi/coreth, update your imports:
// Before
import "github.com/luxfi/coreth/core"
// After
import "github.com/luxfi/evm/core"
All coreth functionality is preserved in this package.
Block Format
To support these changes, there have been a number of changes to the EVM block format compared to what exists on the C-Chain and Ethereum. Here we list the changes to the block format as compared to Ethereum.
Block Header
BaseFee: Added by EIP-1559 to represent the base fee of the block (present in Ethereum as of EIP-1559)BlockGasCost: surcharge for producing a block faster than the target rate
Create an EVM Subnet on a Local Network
Clone EVM
First install Go 1.23.9 or later. Follow the instructions here. You can verify by running go version.
Set $GOPATH environment variable properly for Go to look for Go Workspaces. Please read this for details. You can verify by running echo $GOPATH.
As a few software will be installed into $GOPATH/bin, please make sure that $GOPATH/bin is in your $PATH, otherwise, you may get error running the commands below.
Download the evm repository into your $GOPATH:
cd $GOPATH
mkdir -p src/github.com/luxfi
cd src/github.com/luxfi
git clone [email protected]:luxfi/evm.git
cd evm
This will clone and checkout to master branch.
Run Local Network
To run a local network, it is recommended to use the lux-cli to set up an instance of EVM on a local Lux Network.
There are two options when using the Lux-CLI:
- Use an official EVM release: https://docs.lux.network/subnets/build-first-subnet
- Build and deploy a locally built (and optionally modified) version of EVM: https://docs.lux.network/subnets/create-custom-subnet
Releasing
You can refer to the docs/releasing/README.md file for the release process.
Plugin Runtime Env Vars
The EVM plugin reads its rpcchainvm handshake address and transport from the
unprefixed env var names that current luxd (v1.26+) sets: VM_RUNTIME_ENGINE_ADDR
and VM_TRANSPORT. This matches the canonical names defined in
luxfi/vm/rpc/runtime/runtime.go. Earlier builds of this plugin
(via luxfi/vm ≤ v1.1.0) read LUX_VM_RUNTIME_ENGINE_ADDR/LUX_VM_TRANSPORT,
which are no longer recognized.