Individual security always seems more vulnerable to me, but I think that in a broad picture, decentralization with a constant audit and the need for consensus is much harder to hack.

Since when performing an operation on the chain, the witnesses of the chain will record what was done, what hash is done and that would be visible to any block explorer, it is not impossible, but I think that if it is difficult, that makes me He recalls the old phrase: "One person can be deceived for a long time, many people can be deceived for a short time. But it is quite difficult to deceive many people for a long time."