> What we've learned from Bitcoin is that blockchain technology is robust enough to strongly resist attacks.

Bitcoin is highly vulnerable to spam attacks (as demonstrated several times), malleability, and has forked twice so far, with a double-spend demonstrated during one of them.

Sure Bitcoin's crypto hasn't been broken, but how is that impressive? Bitcoin did not innovate there in any way. It's not like Satoshi invented Merkle trees (otherwise I'm sure they'd be called Satoshi trees:)