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How to show a BSV wallet balance in a website?

I want to display a BSV address, set up and display a funding goal with a progress bar.

As soon as a transaction happen the balance should be live updated and the progress bar should indicate the progress. I have no clue how to set up this. Who can give me a simple code for this?

Thanks.

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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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