[minitech]

> What would be an issue, if they used 128 bit xxhash instead of 128 bit cryptographic hash like they do now (if we assume we don't need to protection from tampering)?

malicious block hash collisions where the colliding block was introduced by some way other than tampering (e.g. storing a file created by someone else)

[zigzag312]

That's a good example. Thanks! It would be kind of an indirect tampering method.