Protocol Upgrades

• Introduce EthTxType Hard-fork that enables new transactions types to support Ethereum transaction types: TxTypeEthereumAccessList and TxTypeEthereumDynamicFee (#1142 #1158)

New Features

• Defined EthereumTxTypeEnvelope (#1171)
• Implemented EIP-2930 signer and London signer for new transaction types (#1142 #1158)
• Introduced rpc.eth.noncompatible flag that disables Ethereum API format compatibility (#1072)
 - Introduced eth namespace API to support Ethereum API format (#1076 #1077 #1083 #1088 #1093 #1095 #1121 #1123 #1124 #1127 #1129 #1130 #1134 #1172)
• Added new klay namespace APIs: klay_maxPriorityFeePerGas, klay_createAccessList, and klay_feeHistory (#1156)
• Added baseFeePerGas field in block header API returns (#1183)
• Implemented State Snapshot (#1112 #1116 #1152 #1154 #1155 #1173 #1174)
• Introduced auto-restart daemon for process crash tolerance (#1101)

Improvements

• Adjusted account manager unlock timing when a node starts (#1141)
• Allowed add/remove multiple validators in a single vote (#1110)
• Enhanced the validation logic of governance voting API (#1109)
• Unified mutexes in blockchain.go (#1099)

Fixes

• Fixed a governance cache initializing bug (#1168)
• Fixed klay_gasPrice API to return propoer gas price values (#1211)
• Fixed race condition issues triggered by transaction fields update (#1091)
• Fixed call tracer panic caused by deep return objects (#1203)

ETC

• Set hard-fork block numbers for Cypress network (#1230)
  • Istanbul EVM compatible hard-fork: 86816005
  • London EVM compatible hard-fork: 86816005
  • EthTxType hard-fork: 86816005
• Set a hard-fork block number for Baobab network (#1230)
  • EthTxType hard-fork: 86513895
  • Baobab network already enabled Istanbul and London EVM compatible hard-forks