In this blog, we look at the Qtum mainnet hard fork at block 680,000 on August 28, 2020. This hard fork added protocol and consensus changes to activate offline staking and was a mandatory update for the Qtum Core wallets Qtum-Qt (the GUI desktop wallet) and qtumd (the command-line server wallet). There were no updates required for other types of wallets (mobile wallets, hardware wallets, etc.) and no new coins were created.
The hard fork for Qtum version 0.19.1 added offline staking capability, allowing address delegation and super stakers. The Qtum Core wallet can now be operated as a super staker to receive address delegations from others and stake their UTXOs. The hard fork happened at block 680,000) on August 28, 2020, at 7:11 pm GMT and only applied to the Qtum Core wallets Qtum-Qt and qtumd, no other wallets. While updated wallets made the hard fork automatically, users that don’t update in time saw their wallets disconnected from the main network, are not be able to make transactions, and (for staking wallets) may see their coins staked on a split chain, where they are difficult to recover. There is no new coin from the hard fork, but a good chance to temporarily lose coins for staking wallets that did not update in time.
Read all about it here: https://blog.qtum.org/hard-fork-special-linux-raspberry-pi-40e60341923d
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