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zeekayandHanzo Dev
1abb712fe8
Single fee-disbursement seam in state_transition.go delegates to creditTxFee (core/fee_split.go): full-fee-to-coinbase legacy path by default, or a deterministic 50%-true-burn + 50%-to-FeeRewardVault (0x0100..0002) split once the standalone FeeSplitTimestamp fork is active. Gated OFF everywhere (FeeSplitTimestamp nil) so the LIVE path stays RewardManager -> DAO Gov Safe; this is the ready in-protocol-split option the DAO can enable later. Proven (CGO off): fee_split_test (split math, conservation, odd-wei, determinism, legacy), fee_split_block_test (end-to-end burn on accepted blocks), reward_manager_routing_test (100% -> DAO Safe + live on-chain setRewardAddress redirect). params/extras suite green incl. the 3 mainnet boot-compat guards. Co-authored-by: Hanzo Dev <[email protected]>
49 lines
2.4 KiB
Go
49 lines
2.4 KiB
Go
// Copyright (C) 2019-2025, Lux Industries, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package core
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import (
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"github.com/holiman/uint256"
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"github.com/luxfi/evm/params"
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"github.com/luxfi/evm/params/extras"
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"github.com/luxfi/geth/common"
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"github.com/luxfi/geth/core/tracing"
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"github.com/luxfi/geth/core/vm"
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ethparams "github.com/luxfi/geth/params"
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)
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// creditTxFee disburses the fee paid by a single transaction.
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//
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// Legacy behavior (FeeSplit inactive) — the full fee is credited to the coinbase
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// (the blackhole 0x0100..00 on the C-Chain), matching historical Subnet-EVM.
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//
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// FeeSplit active — the fee is divided 50/50, deterministically:
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//
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// - rewardShare = fee / 2 (floor) -> credited to extras.FeeRewardVault.
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// This half stays in circulation, parked in a protocol-owned account, to be
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// atomically exported to the P-Chain staking-reward pool where it is paid out
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// through the native staking-reward path (see the "Tx-fee 50/50 split" design
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// in LLM.md). It is NOT minted; it is moved, so it can never double-mint.
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//
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// - burnShare = fee - rewardShare (ceil) -> credited to NO account.
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// Never re-crediting it removes it from the account trie, i.e. the sum of all
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// balances (the supply) decreases by exactly burnShare every transaction. This
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// is a TRUE burn — identical in mechanism to the EIP-1559 base-fee burn — not a
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// transfer to a dead address (which would leave supply unchanged).
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//
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// Determinism: fee is a consensus value (gasUsed * effectiveGasPrice); the split
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// is pure uint256 integer arithmetic (a single right shift) to a fixed address, so
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// every validator computes an identical post-state and the split cannot fork the
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// chain. The odd wei on an odd fee is assigned to the burn (conservative: it never
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// over-credits the reward side, and it keeps burn >= reward exactly).
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func creditTxFee(stateDB vm.StateDB, config *ethparams.ChainConfig, coinbase common.Address, blockTime uint64, fee *uint256.Int) {
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if cfg := params.GetExtra(config); cfg != nil && cfg.IsFeeSplit(blockTime) {
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rewardShare := new(uint256.Int).Rsh(fee, 1) // floor(fee/2)
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stateDB.AddBalance(extras.FeeRewardVault, rewardShare, tracing.BalanceIncreaseRewardTransactionFee)
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// burnShare = fee - rewardShare is intentionally left uncredited (true burn).
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return
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}
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stateDB.AddBalance(coinbase, fee, tracing.BalanceIncreaseRewardTransactionFee)
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}
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