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bitcoin fox 1 ethereum bitcoin credit Both hot wallets and cold storage can be used together, just as a saving accounts and purse are often used by the same person. Cold storage funds are held securely, but are hard to access. Hot wallet funds are kept ready to spend at a moment’s notice, but are stored less securely.Once step (1) has taken place, after a few minutes some miner will include the transaction in a block, say block number 270. After about one hour, five more blocks will have been added to the chain after that block, with each of those blocks indirectly pointing to the transaction and thus 'confirming' it. At this point, the merchant will accept the payment as finalized and deliver the product; since we are assuming this is a digital good, delivery is instant. Now, the attacker creates another transaction sending the 100 BTC to himself. If the attacker simply releases it into the wild, the transaction will not be processed; miners will attempt to run APPLY(S,TX) and notice that TX consumes a UTXO which is no longer in the state. So instead, the attacker creates a 'fork' of the blockchain, starting by mining another version of block 270 pointing to the same block 269 as a parent but with the new transaction in place of the old one. Because the block data is different, this requires redoing the proof of work. Furthermore, the attacker's new version of block 270 has a different hash, so the original blocks 271 to 275 do not 'point' to it; thus, the original chain and the attacker's new chain are completely separate. The rule is that in a fork the longest blockchain is taken to be the truth, and so legitimate miners will work on the 275 chain while the attacker alone is working on the 270 chain. In order for the attacker to make his blockchain the longest, he would need to have more computational power than the rest of the network combined in order to catch up (hence, '51% attack').

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7) “Where to Buy Bitcoin”
The most frequent question I get about Bitcoin is simply where to buy bitcoins. Some people don’t know how to start, and other people are familiar with the popular places to buy, but don’t know which ones are ideal.

There’s no one answer; it depends on your goals with it, and where you live in the world.

The first question to ask is whether you’re a trader or a saver. Do you want to establish a long-term Bitcoin position, or buy some with a plan to sell it in a few months? Or maybe some of both?

The second question to ask yourself is whether you want to self-custody it with private keys and a hardware wallet or multi-signature solution, which has an upfront learning curve but is ultimately more secure, or if you want to have someone else custody it for you, which is simpler but involves counterparty risk.

Bitcoin is accessible through some publicly traded funds, like the Grayscale Bitcoin Trust (GBTC), of which I am long. However, funds like these trade at a premium to NAV, and rely on counterparties. A fund like that can be useful as part of a diversified portfolio in an IRA, due to tax advantages, but outside of that isn’t the best way to establish a core position.

Bitcoin is also available on major exchanges, where it can then be sent to a private hardware wallet or elsewhere. I don’t have a strong view on which exchanges are the best. However, be careful about platforms that don’t let you withdraw your Bitcoin, like Robinhood. I personally bought my core position through an exchange in April when I turned bullish, and transferred a lot of it to personal custody.

From there, I began dollar-cost averaging through Swan Bitcoin, where it can be kept in their cold storage or transferred out to personal custody as well. Swan specializes in Bitcoin (rather than multiple types of digital assets), and has very low fees for folks who like to dollar-cost average. It’s a saver’s platform, in other words, rather than a trader’s platform. I’m an advisor to Swan Bitcoin and know several of their staff including their CEO, so it’s my preferred way to accumulate Bitcoin.

Overall, having access to a crypto exchange, and having access to a dollar-cost averaging platform like Swan, along with a personal custody solution like a hardware wallet or a multi-signature solution, is a good combo.

For folks who are early in the learning curve, keeping it on an exchange or in custody storage is also fine, and as you learn more, you can choose to self-custody if it’s right for your situation.



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