📅 Original date posted:2019-10-14 📝 Original message:On 10/12/19 10:56 AM, Joachim Strömbergson via bitcoin-dev wrote: > [...] First you provide proof of your best block height via coinbase [...] So I don't think you can use the height in the coinbase for that purpose, as it's not possible to validate it without the previous headers. That's common for more than just the height. > [...] to generate much longer chain with superslow timestamp increase (~5 blocks in 1 second) without increasing difficulty (i.e. staying at min. diff.). [...] In that case, it would take about 7 minutes of block time seconds for the next retarget period, every 2016 blocks, and the difficulty would adjust. The difficulty would adjust in that case as if 2 weeks of blocks had been mined in 7 minutes. For the difficulty to remain the same the time between blocks needs to be 10 minutes.