Mining algorithms that have aspects that are thought to be harder/more expensive to implement as ASIC chips. For example, Ethereum implements a number of tacti

Mining algorithms that have aspects that are thought to be harder/more expensive to implement as ASIC chips. For example, Ethereum implements a number of tactics to achieve that: - relatively large memory size and bandwidth requirements. - linearly growing memory requirements over time. - announced plans to deprecate mining altogether and switch to proof-of-stake, turning all specialized hardware into pumpkins when it happens. I don't know that it's necessarily enough to make ASIC miners impossible, but it seems to have had some success at keeping the bulk of the mining on GPUs, longer than some of its peers.