Evaluate first round of metro hard fork

[realcodywburns]

The first ETH Hard fork in the metropolis fork will be the Byzantium release. will contain the following, however, not all are applicable to ETC:

• EIP-100 Change difficulty adjustment to target mean block time including uncles | #916
• EIP-206 REVERT instruction in the Ethereum Virtual Machine | #918
• EIP-213 Precompiled contracts for addition and scalar multiplication on the elliptic curve alt_bn128 | #924
• EIP-212 Precompiled contract for pairing check
• EIP-198 Precompiled contract for bigint modular exponentiation | #920
• EIP-211 New opcodes: RETURNDATASIZE and RETURNDATACOPY | #919
• EIP-214 New opcode STATICCALL | #922
• EIP-649 Metropolis Difficulty Bomb Delay and Issuance Reduction
• EIP-658 Embedding transaction return data in receipts
• EIP-684 Prevent overwriting contracts

A section has been added to the wiki page to indicate support of proposals

ethereum/ethereumj#923

[sorpaas]

Already under discussions are:

• ECIP-1025 ECIP-1025: Precompiled Contracts for zkSNARK Verification #66: derived from EIP-212 and EIP-213. ECIP-1035 ECIP-1035: ETC-PE Stealth Address #78 (needs to be combined with others) is a competing ECIP with this.
• ECIP-1026 ECIP-1026: Modexp Precompiled Contract #67: derived from EIP-198.

EIP-649 does not apply to ETC chain.

The hard fork support wiki page is at https://github.com/ethereumproject/ECIPs/wiki/Hard-Fork-Support. Please create a new ECIP (if not already existing) to accommodate discussions within the community if you prefer some of the above EIPs.

[sorpaas]

Recent Solidity changes have broken Ethereum Classic because it uses RETURNDATASIZE/RETURNDATACOPY and possibly others. Here's an example: openethereum/parity-ethereum#8503

Just a reminder that ETC community would probably want to:

• Maintain an older version of Solidity.
• Or speed up this issue and adopt necessary Byzantium hard forks.

[realcodywburns]

Closing, this repo is depreciated . To be reopened on http://github.com/ethereumclassic/ECIPs