The Spurious Dragon fork is the second of two forks responding to a denial-of-service attack on the Ethereum network. It tunes the prices of EVM instructions, adds protection against replaying transaction on different chains, limits the maximum size of contract code, and enables the removal of empty accounts.

Changes

• EIP-155: Simple replay attack protection

• EIP-160: EXP cost increase

• EIP-161: State trie clearing (invariant-preserving alternative)

• EIP-170: Contract code size limit

Upgrade Schedule

Releases

• Geth 1.5.2

• Parity 1.4.4

• ruby-ethereum 0.11.0