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How are Bitcoin blocks structured?

Bitcoin blockchain is made of individual blocks. I am wondering how do these blocks actually look like. Which different data types are part of them? What is each part of the block used for, what is its meaning and what are the possible values that can those values take?

I would also like to, assuming I am looking at a block’s HEX blob, be able to decode it/determine various parts of it.

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How can Bitcoin help us fight with Coronavirus?

We are looking for ideas about how could Bitcoin help us to fight the Coronavirus (or any future) pandemic.

Think about ways Bitcoin could help individuals through this, but also about how it could help health care systems to more efficiently cope with increased number of cases.

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How do Bitcoin payment channels work?

I would like to know how payment channel mechanic works in practice. What do the involved parties need to do, which information they exchange and how is the security ensured.

Bonus question: What different types of payment channels exist?

Only answers that actually explain channels will qualify for the bounty. While linking to 3rd party sources is encouraged and desired, answers that solely do that won’t count.

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How do I create a counter like bitqa.app uses that increases the “Answer: 0” count and stays?

I’m a programming noob trying to build a website using Money Button and BSV blockchain. I need help (or a visual of code) writing code that increases a number on the page after the Money Button is swiped. Just how “Answers: 0” gets increased by +1 on bitqa.app after paying. I hope $5 bounty for best answer is enough. Thanks in advance!

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How does IP2IP work?

I heard a lot of discussions mentioning IP2IP at the recent CoinGeek conference in Seoul. I really like the idea of users exchanging transactions peer-to-peer, but I am wondering how IP2IP works on a technical level?

Does it require a daemon/service running on the recipient’s computer that listens for incoming transactions or is there some other approach?

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