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Why prices on different Bitcoin exchanges are not the same?

There is a big difference because arbitrage between exchanges is slow and dangerous due to the legacy financial system's defects. It's a high risk of regulatory problems because banks see this as money laundering. They are obligated by law to play the security theater and will cause problems to arbitrage traders moving fiat funds between exchanges. If you know how to move funds between exchanges fast and with less fees – there is a profitable (but risky) business opportunity. If our current financial system allowed for immediate transfers between participants, arbitrage would eliminate these price spreads on different exchanges.

US dollars are backed by...

US dollars are backed by the fact that the government will put you in jail if you don't buy US dollars to pay your taxes. You can use only US dollars to pay taxes in US and other countries. This way the government is supporting the price of US dollar.

Bitcoin is drawing the interest of tax authorities in many countries

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One of the things that many people don't realize is that Bitcoin is drawing the interest of tax authorities in many, many different countries all over the world. What is quite clear is that Bitcoin trading is jumping right to the front of the queue of priority tax investigations. This is easy to note by having a look at the official web pages of assorted European tax authorities, and also at the US IRS. What this article is hinting at is that tax authority cooperation across many different national jurisdictions is converging. Bitcoin proponents really aren't paying enough attention to what happens when you actually try to monetize your gains. Forget the Blockchain. Look at the final result (house, fancy new car, fancy boat, hefty bank account) instead. Because that is what the authorities will do.

Keep your cryptocurrency keys securely!

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Don't forget to make backup of your keys even if you use hardware wallet.Hardware wallets use flash memory (like SSD disks, USB flash drives) and this type of memory is prone to failure, especially when it's not powered for weeks or more.Hardware wallets are great for making secure transactions, however it's irresponsible to keep your private keys only on them (without backup).I have a habit to write multiple copies of my important files when I use floppy disks, USB flash drives and optical disks (CD, DVD).I not only use multiple mediums, but also write the file several times on every medium.DVDs are more reliable than CDs, I prefer DVD+R (instead of DVD-R).Here is my short guide: Archiving private keys - TLDR version

Bitcoin Vault for a paper wallet?

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"Fun Place to store your Bitcoin Paper Wallet" - at least they are honest - they do not claim that the place is safe, they said it's fun. Who needs "fun" place for such purposes? Link to product page on Amazon.Archiving private keys - TLDR version

Bitching about Lightning Network won't help you stop it

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All of you who keep bitching about Lightning Network, you need to realize that Lightning Network is a layer 2 technology, which by definition layer 1 doesn't know about and isn't affected by. Just like TCP doesn't know about the contents of the encapsulated SSH and HTTPS that it's transporting. Furthermore, the development of Lightning Network is permissionless, and anything that's permissionless and useful will inevitably come into existence due to market forces. There is literally nothing at this point that can stop it. Moaning about it, spreading lies and fud etc won't stop it. You are wasting your energy. Give it a rest already. Go do something useful with your life.

Forking of Bitcoin is good

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Forking is good. Because THIS IS D-E-M-O-C-R-A-C-Y! You can vote with your wallet what to use as money. Also, there are hundreds of altcoins... This is good. Let's users decide which coin to use. Some cryptocurrencies have interesting features (not available by default on Bitcoin), like Monero (privacy). Some have very little transaction fees - they are good for permissionless micropayments (no need to rely on 2-nd layer like AdvCash, Payeer with free/cheap internal transactions).

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