Intro As cryptographers who develop data security tools that heavily involve cryptography (surprise surprise), we get asked a lot of questions about “crypto”. Unfortunately, not “cryptozoology”* crypto, but neither it is cryptography. Very often it is about blockchain. More and more tools claim to have “unprecedented levels of security” or “GDPR compliance & security by design” when using security designs based on blockchain and distributed consensus systems. But blockchain solutions have pre-de...