Blockchain solutions has one of the key advantage that they are pretty much hacking resistant, because of the chain of blocks and hashes that going back up to the genesis block. However, most of the applications do not necessarily require such a huge security guarantee, it is probably enough if data can not be hacked and consistent considering the last couple of months or years. On the other hand, there can be the requirement to delete from a blockchain solution or has the possibility to forget or modify data. On solution might be to design a blockshain platform where data is not hashed back to the genesis block, but only the last couple of like thousands of blocks are considered. Certainly, it is a question how such algorithm can be realized in a hacking resistant way. One solution might be to try to use instead of cryptographic hashes, a kind of cryptographical rolling hashes, where only a certain number of past values are considered as input.