Proof-of-Work blockchain is safer

in PoW blockchain method the client has a time limit for receiving hashing answers from the blockchain network, so it can assure that it is connected to a blockchain with an International-scale hashing power. It is safer than log transparency.
Out of curiosity were you aware of this safety feature of PoW blockchain’s method?

About bitcoin network fees, layer 2 should be used. Layer 2 security depends on the main blockchain. I think BlockStack has done the same and it is free to use.

I don’t think blockchain is the right tool here. It makes a lot of trouble to setup a big enough network of nodes for this and the only thing one might need here is the existing collection of hash checksums.

I did try blockchain for another project where both sides would not trust each other for 100%, so it did make sense there.