Validate that downloaded data is correct

[IgorShadurin]

It would be nice to check the downloaded data due to an issue in Bee ethersphere/bee#3714.

[nugaon]

how do you want to check that? building up bmt for all downloaded data on client side is quite heavy.
IMO the Bee client should handle this on request (that it does maybe, just the http error code handling on streaming is wrong)

[IgorShadurin]

how do you want to check that? building up bmt for all downloaded data on client side is quite heavy. IMO the Bee client should handle this on request (that it does maybe, just the http error code handling on streaming is wrong)

If the bmt validation is slow, then a new field in the metadata can be added with a hash of some browser-friendly algorithm to check the integrity of the file.

Even something like md5 can be used, since the hash is stored encrypted in the metadata and cannot be used by a malicious gateway to generate a collision.