forked from cerc-io/laconicd-deprecated
54 lines
2.1 KiB
Markdown
54 lines
2.1 KiB
Markdown
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order: 3
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-->
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# Begin block
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The base fee is calculated at the beginning of each block.
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## Base Fee
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### Disabling base fee
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We introduce two parameters : `NoBaseFee`and `EnableHeight`
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`NoBaseFee` controls the feemarket base fee value. If set to true, no calculation is done and the base fee returned by the keeper is zero.
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`EnableHeight` controls the height we start the calculation.
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- If `NoBaseFee = false` and `height < EnableHeight`, the base fee value will be equal to `base_fee` defined in the genesis and the `BeginBlock` will return without further computation.
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- If `NoBaseFee = false` and `height >= EnableHeight`, the base fee is dynamically calculated upon each block at `BeginBlock`.
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Those parameters allow us to introduce a static base fee or activate the base fee at a later stage.
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### Enabling base fee
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To enable EIP1559 with the EVM, the following parameters should be set :
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- NoBaseFee should be false
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- EnableHeight should be set to a positive integer >= upgrade height. It defines at which height the chain starts the base fee adjustment
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- LondonBlock evm's param should be set to a positive integer >= upgrade height. It defines at which height the chain start to accept EIP1559 transactions
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### Calculation
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The base fee is initialized at `EnableHeight` to the `InitialBaseFee` value defined in the genesis file.
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The base fee is after adjusted according to the total gas used in the previous block.
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```golang
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parent_gas_target = parent_gas_limit / ELASTICITY_MULTIPLIER
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if EnableHeight == block.number
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base_fee = INITIAL_BASE_FEE
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else if parent_gas_used == parent_gas_target:
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base_fee = parent_base_fee
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else if parent_gas_used > parent_gas_target:
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gas_used_delta = parent_gas_used - parent_gas_target
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base_fee_delta = max(parent_base_fee * gas_used_delta / parent_gas_target / BASE_FEE_MAX_CHANGE_DENOMINATOR, 1)
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base_fee = parent_base_fee + base_fee_delta
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else:
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gas_used_delta = parent_gas_target - parent_gas_used
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base_fee_delta = parent_base_fee * gas_used_delta / parent_gas_target / BASE_FEE_MAX_CHANGE_DENOMINATOR
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base_fee = parent_base_fee - base_fee_delta
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```
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