The Istanbul fork (EIP-1679) makes changes to the gas costs of EVM instructions and data, adds a cryptographic primitive, and introduces an instruction to fetch the current chain identifier.

Changes

• EIP-152: Add BLAKE2 compression function F precompile

• EIP-1108: Reduce alt_bn128 precompile gas costs

• EIP-1344: ChainID opcode

• EIP-1884: Repricing for trie-size-dependent opcodes

• EIP-2028: Transaction data gas cost reduction

• EIP-2200: Structured Definitions for Net Gas Metering

Upgrade Schedule

Releases

• Aleth 1.7.1

• Besu 1.3.6

• EthereumJS 4.0.2

• Geth 1.9.9

• Nethermind 1.2.3

• Parity 2.5.11-stable

• Trinity 0.1.0-alpha.31