Blockchain was the first serious attempt at solving the problem of distributed concensus without centralisation. One application of this outside of cryptocurrency is to DNS (see Namecoin).
Cryptocurrencies at the very least make black market trading more efficient. See Silk Road.
Also, the analogy to alchemy needs a lot more explaining. I don't see any connections.
Blockchain was the first serious attempt at solving the problem of distributed concensus without centralisation. One application of this outside of cryptocurrency is to DNS (see Namecoin).
Cryptocurrencies at the very least make black market trading more efficient. See Silk Road.
Also, the analogy to alchemy needs a lot more explaining. I don't see any connections.