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86 lines
3.3 KiB
Markdown
86 lines
3.3 KiB
Markdown
---
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eip: 698
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title: OPCODE 0x46 BLOCKREWARD
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author: Cody Burns <dontPanic@codywburns.com>
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discussions-to: https://github.com/ethereum/EIPs/issues/698
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status: Draft
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type: Standards Track
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category: Core
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created: 2017-08-28
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---
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## Simple Summary
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This EIP adds an additional opcode to the EVM which will return a finalized blocks reward value.
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## Abstract
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In the EVM, the 0x40 opcodes are reserved for `Block Information`. Currently reserved opcodes are:
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* `0X40 BLOCKHASH`
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* `0X41 COINBASE`
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* `0X42 TIMESTAMP`
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* `0X43 NUMBER`
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* `0X44 DIFFICULTY`
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* `0X45 GASLIMIT`
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This EIP would add an additional opcode, `0x46 BLOCKREWARD`, which would return the block reward for any finalized block. The finalized block reward would include the base reward, uncle payments, and gas.
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## Motivation
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Per EIP-649 ( #669 ) periodic block reward reductions/variance are now planned in the roadmap, however, this EIP is consensus system agnostic and is most useful in decentralized pool operations and for any contract that benefits from knowing a block reward payout(i.e. Merge mined tokens)
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## Specification
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After block `n` all clients should process opcode `0x46` as follows:
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* Value: `0x46`
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* Mnemonic: `BLOCKREWARD`
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* δ:` 0` nothing removed from stack
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* α:`1` block reward added to stack
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* Description: `Get the block's reward emission`
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* GasCost: `G<sub>base</sub>`
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Where:`µ'<sub>s</sub>[0] ≡ I<sub>HR</sub>`
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## Rationale
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### Contract Mining Pools
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For distributed consensus systems(staking pools and mining pools) ad hoc groups combine resources in order to reduce variance in payouts. Broadly, pool operations function by allowing a collective of miners / stakers to verify their contribution to solving PoW or staking share by periodically submitting solutions which are is representative of the miners probability of finding a true block.
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In all these schemes `B` stands for a block reward minus pool fee and `p` is a probability of finding a block in a share attempt ( `p=1/D`, where `D` is current block difficulty).
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Some common methods of mining pool payout are pay-per-share, `R = B * p`, proportional [`R = B * (n/N)` where `n` is amount of a miners shares, and `N` is amount of all shares in this round.], and pay-per-last-N-shares [`R = B * (n/N)` where miner's reward is calculated on a basis of `N` last shares, instead of all shares for the last round]. All of these methods are predicated on knowing the block reward paid for a given block. In order to provide a trust minimized solution, `0x46` can be used to call a blocks reward for computing payouts.
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### Merge mined tokens
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Contracts could create tokens which could be variably ‘minted’ as a function of block reward by calling `0x46`
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## Backwards Compatibility
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### Currently deployed contracts
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No impact
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### Current clients
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This EIP would be incompatible with currently deployed clients that are not able to handle `0x46` and would process all transactions and block containing the opcode as invalid.
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Implementation should occur as part of a coordinated hardfork.
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## Implementation
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## Further reading
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[Mining Pools](https://en.wikipedia.org/wiki/Mining_pool)
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The Yellow Paper Appendix H. Virtual Machine Specification section H.2
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## Copyright
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Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
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