zeekayandHanzo Dev
a10a2f1e0e
The fee split braided two independent concerns into one line: how much of a
fee is kept (a protocol constant, floor(fee/2)) and where the kept part goes
(compiled-in extras.FeeRewardVault = 0x0100..02). The second half made the
destination ungovernable and silently bypassed the RewardManager precompile
the moment FeeSplit activated, so turning the burn on would have DISABLED the
one on-chain knob the chain already has.
Split the concerns:
ratio -> stays a right shift. Fixed, auditable, not settable by any
transaction. Changing it remains a release plus a coordinated
fork, deliberately: monetary policy should not move at the
speed of a multisig.
destination -> the configured coinbase, i.e. BlockChain.GetCoinbaseAt, i.e.
the RewardManager precompile's stored address. Already part of
header validity (dummy.verifyCoinbase), so it is verifiable
from the header and movable by one admin transaction.
creditTxFee collapses to one credit site; extras.FeeRewardVault is deleted.
Also adds the ordering gate this created a need for: ChainConfig.Verify now
refuses a config that schedules feeSplitTimestamp while rewardManagerConfig is
not enabled at that time (and allowFeeRecipients is off). Without RewardManager
GetCoinbaseAt falls back to the keyless blackhole, so such a config would burn
half of every fee and strand the other half forever -- the C-Chain already has
~3867 LUX stuck at that address. mainnet/cchain.json currently ships exactly
that shape (feeSplitTimestamp 1785715200, no rewardManagerConfig in any of the
49 precompileUpgrades); the node will now refuse to start on it instead.
This is a no-op on every live chain: mainnet 96369's running config has no
feeSplitTimestamp at all (eth_getChainConfig), the vault balance is 0, and the
branch has never executed. The correction is free today and costs a fork later.
Tests:
core: destination follows the configured coinbase; a redirect mid-chain moves
the whole reward stream while the burn is unchanged; supply conservation
on executed blocks; genesis refuses the ungoverned shape.
dummy: a proposer naming any other coinbase is rejected with ErrInvalidCoinbase,
so crediting the header coinbase is not a validator-capture hole.
extras: the verbatim upgrade.json fragment activating rewardManagerConfig and
feeManagerConfig with the DAO Safe as adminAddresses parses through the
registry, and feeManager's governable surface contains no ratio.
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.