BNB Smart Chain, one of the popular blockchain platforms, is set to undergo a scheduled hard fork upgrade named Planck at block height 27,281,024. The upgrade is expected to take place on 12th April 2023 at 05:30 AM (UTC) and is expected to introduce several new features and bug fixes. The upgrade is considered a breaking change, and all validators and full node operators on the mainnet are required to switch their software version to v1.1.21 before the hard fork block height.
Max Planck, the Nobel Prize-winning physicist, is the namesake of this hard fork upgrade. The upgrade will introduce several security enhancements to the cross-chain bridge between BNB Beacon Chain and BNB Smart Chain, as well as improve network stability by changing the timestamp and delay setting for offturn validators.
As a full node operator, it is essential to upgrade to v1.1.21 before the hard fork block height to ensure that your node can receive and execute further blocks normally after the hard fork. Failure to upgrade your software before the hard fork block height will result in your inability to connect or send transactions.
As a developer, there are no changes to the EVM module, and you do not need to do anything. However, it is crucial to note that the BEP-171 Security Enhancement for Cross-Chain Module introduces several security enhancements to the cross-chain bridge between BNB Beacon Chain and BNB Smart Chain.