Le 14/11/2017 à 12:31, Karsten Hilbert a écrit : >> A Blockchain is a public (or at least shared) digital notary. > ... >> transactions are more expensive without a third party, because you need >> to make the process of adding a new block "expensive enough" in order to >> make sure that the one doing it can not deploy enough computing power to >> hack the existing blocks during the process. > And, one needs to remind oneself, "expensive enough" can only ever mean > "today".
Hi Karsten, This is the reason why, at least in the Bitcoin universe, adding a block is organized as a competition between miners. Hence a bad guy who intends to use the addition of a new block as an opportunity to modify some already existing blocks would need to process this much more complex task quicker than the other miners who simply concentrate on adding a block. It can currently been argued that this competition led to concentrating miners in China... but what could possibly go wrong? ;-) Philippe _______________________________________________ openEHR-technical mailing list [email protected] http://lists.openehr.org/mailman/listinfo/openehr-technical_lists.openehr.org
