EIPs/EIPS/eip-609.md

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## Preamble
EIP: 609
Title: Hardfork Meta: Byzantium
Author: Alex Beregszaszi
Type: Standard Track
Category: Core
Status: Final
Created: 2017-04-23
Requires: 100, 140, 196, 197, 198, 211, 214, 649, 658
## Abstract
This specifies the changes included in the hard fork named Byzantium.
## Specification
- Codename: Byzantium
- Aliases: Metropolis/Byzantium, Metropolis part 1
- Activation:
- Block >= 4,370,000 on Mainnet
- Block >= 1,700,000 on Ropsten testnet
- Included EIPs:
- [EIP 100](./eip-100.md) (Change difficulty adjustment to target mean block time including uncles)
- [EIP 140](./eip-140.md) (REVERT instruction in the Ethereum Virtual Machine)
- [EIP 196](./eip-196.md) (Precompiled contracts for addition and scalar multiplication on the elliptic curve alt_bn128)
- [EIP 197](./eip-197.md) (Precompiled contracts for optimal ate pairing check on the elliptic curve alt_bn128)
- EIP 198 (Precompiled contract for bigint modular exponentiation)
- [EIP 211](./eip-211.md) (New opcodes: RETURNDATASIZE and RETURNDATACOPY)
- [EIP 214](./eip-214.md) (New opcode STATICCALL)
- [EIP 649](./eip-649.md) (Difficulty Bomb Delay and Block Reward Reduction)
- [EIP 658](./eip-658.md) (Embedding transaction status code in receipts)
## References
1. https://blog.ethereum.org/2017/10/12/byzantium-hf-announcement/
## Copyright
Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).