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#2 + EIP100: Change difficulty adjustment to target mean block time including uncles #8

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#2 + EIP100: Change difficulty adjustment to target mean block time including uncles #8

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5 changes: 4 additions & 1 deletion ECLIPs/ECLIP-etcbyz.md
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Expand Up @@ -13,14 +13,15 @@ Add support for a subset of protocol-impacting changes introduced in the Ethereu

- Byzantium EVM opcodes and precompiled contracts, namely opcodes `REVERT` (EIP 206/140), `RETURNDATASIZE` (EIP 211), `RETURNDATACOPY` (EIP 211), and `STATICCALL` (EIP 214/116); and precompiled contracts for modular exponentiation, elliptic curve addition, scalar multiplication, and pairing (EIPs 198, 212/197, 213/196)
- Replacing the intermediate state root field in transaction receipts with the contract return status (EIP 658).
- Change difficulty adjustment to target mean block time including uncle (EIP 100)

This document proposes block `X,XXX,XXX` as the upcoming block height at which to implement these changes in the network, placing the expected date of protocol hardfork date on _XXXX-XX-XX_.

For more information on the opcodes and their respective EIPs and implementations, please see the __History__ section of this document.

### Motivation

To enhance the EVM's capabilities by adding 5 opcodes and 4 precompiled contracts, all of which have been in use on the ETH network since 2017-10-16. Adoption of the "receipt status" feature provides a helpful method for Dapp developers to access the successful or failed state of a contract. This would (re)establish a greater level of interoperability between Foundation and Classic Ethereum Virtual Machines ("EVM"s), and make a wider array of tooling available for the ETC network (eg. Solidity version, several contract debugging tools).
To enhance the EVM's capabilities by adding 5 opcodes and 4 precompiled contracts, all of which have been in use on the ETH network since 2017-10-16. Adoption of the "receipt status" feature provides a helpful method for Dapp developers to access the successful or failed state of a contract. This would (re)establish a greater level of interoperability between Foundation and Classic Ethereum Virtual Machines ("EVM"s), and make a wider array of tooling available for the ETC network (eg. Solidity version, several contract debugging tools). The proposed change to the difficulty formula ensures that the difficulty adjustment algorithm targets a constant average rate of blocks produced including uncles, and so ensures a highly predictable issuance rate that cannot be manipulated upward by manipulating the uncle rate.

This protocol specification notably omits the scheduled features of the anticipated _Constantinople_ fork, which would be expected to include various further EVM upgrades. The reasoning for this omission hinges on a hedge toward battle-testing of those changes in light of multiple delays of that fork ([here](https://medium.com/ethereum-cat-herders/a-post-mortem-report-the-constantinople-ethereum-hard-fork-postponement-dd780d7ae63d), a postmortem of the latest delay) due to security and implementation discrepencies.

Expand Down Expand Up @@ -59,6 +60,8 @@ These changes are catalogued via the EIP process in the following:

- EIP-658: Transaction receipts embedding status code instead of intermediate state root field - https://github.com/ethereum/EIPs/pull/658/files

- EIP-100: Change difficulty adjustment to target mean block time including uncles - https://github.com/ethereum/EIPs/issues/100

- EIP-140: `REVERT` - https://github.com/ethereum/EIPs/pull/206/files

> The `REVERT` instruction provides a way to stop execution and revert state changes, without consuming all provided gas and with the ability to return a reason.
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