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Double hash in Bitcoin

what exactly is this? Does this mean every TX gets hashed twice? How does it help to filter the content from the block chain (As Dr. Wright said)? Why cant i hash it just once and save the hash of the TX and prune the data (illegal)? Isnt the content now filtered with just a single hash? or am i getting it wrong?

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Is it possible to use browser's crpyo primitives with bsv library?

I have some code that does a lot of HD derivation and ECIES encryption/decryption and I noticed that it runs quite slow in the browser. I did some profiling and it seems that it spends most of the time in the libraries that handle primitives (sha256 hashing, big int, …).

This makes sense as it seems that we have this primitives natively in node, but we need to use libraries in the browser. I did some Googling and it seems that newer browsers do have some support for this things so I was wondering if it is possible to use that when available? I suspect that would speed up things significantly?

I am thinking about browser’s native APIs such as SubtleCrypto and BigInt. Or even an Emscripten-compiler Javascript library such as js-nacl.

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Who will reach speed of light first?

Whenever the fastest antelopes escape and the slowest are eaten, it becomes more and more difficult for future lions to catch the fast antelopes, so that only the fastest lions can survive and reproduce. This leads to ever faster lions and antelopes. So the question is, who will reach the speed of light first? Lion or antelope?

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How is it decided whether a question has been answered satifactorally or not on BitQ&A?

How is it decided whether a question has been answered satisfactorily or not on BitQ&A? If I pose a question and someone answers do I have to approve their answer and then authorise payment?

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