You own what you own and it is worth what it is worth. What you paid for it makes no difference, so forget the past. It is irrelevant. It doesn't matter whether you paid £27,705 or £2,770 for a bitcoin. That bitcoin is still worth £24,347 now. Whether you have a profit or a loss, you have a bitcoin worth £24,347. It makes no difference either way (except for bragging rights if you are that kind of person).

The future of your bitcoin is unrelated to the past, so there is no reason to base your actions on the past. Base your actions solely on your expectations for the future.

You don't have a wallet address at Coinbase. You have a deposit address. When you send bitcoins to that address, Coinbase credits your account. Then, they move the bitcoins to other addresses. When you withdraw bitcoins, you will not receive them from that address. When you buy or sell bitcoins, they will not be moved in or out of that address.

Given that, it is difficult to know if an address belongs to Coinbase or not. However, Coinbase has a record of all of your deposit addresses, so they can probably tell you or maybe you can look it up on the site.

Perhaps it might be easier to help if you explain your goal. Why do you need to track down addresses for taxes? That seems unusual.

Binance (and other exchanges) have buyers and sellers. If you buy 0.0001 BTC, you are buying from a seller. If you are buying from the exchange, then the exchange is acting as the middle man.

GBTC, the Grayscale Bitcoin Trust, is simply a company that owns bitcoins. If you own shares of GBTC, you own a portion of the trust and therefore you own that portion of the trust's bitcoins.

The advantage of owning GBTC rather than owning bitcoins directly is that you can hold the shares in a brokerage account and trade them in the stock market. In the U.S., the ability to hold bitcoins in a retirement account is very restricted, but the ability to hold GBTC shares is not.

The disadvantage is that you are relying on GBTC to hold the bitcoins for you, potentially increasing the risk of loss or theft. Additionally, when you buy shares on the open market you are paying a premium for the bitcoins that they represent. Furthermore, Grayscale Investments (different from GBTC) is paid a fee of 2% per year from the trust to manage the trust.

If the advantages don't apply to you, then there is no reason to own shares of GBTC instead of bitcoins.

I'm not a tax expert, but my understanding is that if the other country has an agreement with the U.S., then you can deduct the taxes paid to the other country from the U.S. taxes you owe.

For example: https://turbotax.intuit.ca/tips/how-are-taxes-assessed-for-u-s-citizens-working-in-canada-347

Sorry to say it, but that data looks like random garbage. It might be encrypted, but there is no identifiable metadata that would indicate it except for bytes 02-03, which might be the size of the data, assuming that the size of the metadata is 16 bytes.

I don't know the answer, but perhaps you could get a estimate by dividing the amount of time it takes to synch your node by the number of transactions in the blocks you synched. As long as your are well-connected, then most of the time spent synching is spent validating the transactions.

Keep in mind that it depends a lot on your node's hardware, of course.

FYI, if you are a resident or citizen of U.S.A, then you are required to pay taxes on capital gains, regardless of where you spend or sell your bitcoins.

Somebody is squatting on that address and redirecting it to Goldman Sachs as a marketing ploy.

The block chain does not contain records of sales of bitcoins. It only contains records of transfers and creation.

The first transfer of bitcoins was this one from Satoshi to Hal Finney: https://www.blockchain.com/btc/tx/f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16

If your ability to mine for the subsidy is such a great benefit, why aren't you taking advantage of it?

There are two ways to obtain bitcoins: spend money to mine them, and spend money to buy them. Bitcoins have always been and will always be available to everyone equally.

The fact that the difficulty is based on the time for 2015 blocks rather than 2016 has been a long-standing bug.  The result is that the expected block time is actually 600.3 seconds.

Random is non-deterministic by definition, so it is a mistake to believe that any aspect of randomness is deterministic. You can quote me on that.



Also, has it been proven that all possible 256-bit values can be produced by SHA-256? And we assume that the output is uniform, but is that actually known?

I propose that we refer to this event as the Double-Spend Panic of 2021. Like all the others, it will fade into obscurity.

Grayscale does not buy or sell bitcoins. They exchange shares for bitcoins, and investors can buy or sell shares.

Currently, Grayscale does not allow redemption of shares, so there is no immediate danger of an investor redeeming shares for bitcoins and selling those bitcoins.

Mining is a business. Whether miners succeed or fail depends on how well they run their business. Simply being the people that maintain the block chain won't automatically put them "on top forever".


Not all small miners mine at a loss. It depends on costs. As long as it costs you less then 1 BTC to mine 1 BTC, you will make a profit, regardless of your hash rate. Now, like your farm, big miners can lower costs more effectively than small miners, so it is true that small miners will have a more difficult time making a profit.



There isn't 1 farmer in the end, and similarly it is not likely that there will be 1 miner in the end. And while central banks and governments print all the fiat, that doesn't mean they will become miners.

I don't want to be interviewed, but I spend my bitcoins regularly on stuff at Amazon using Purse.io. I pay for travel and vacations through CheapAir.com, and sometimes I buy gold coins at APMEX and JM Bullion.

Using Purse.io is inconvenient, but it is worth the effort because it comes with a big discount. If Amazon ever accepts bitcoins directly or pays people bitcoins instead of points, I don't think Purse.io will survive.

I set up an account at Fidelity Charitable and donated some bitcoins. That all went fairly smoothly, although it did involve some emails and phone calls. Then, I portioned out the funds from Fidelity's sale to a few charities. I paid $120 for the appraisal -- that was a legally-required waste of money. I got lucky and the bitcoins were sold at the the top, so the appraiser just used the sale price.

Miners don't have to maintain the entire ledger, just a block at a time. The cost of mining is not affected by the size of the block chain.

Miners will mine Bitcoin as long as it is profitable, and Bitcoin is designed such that mining is always profitable for some miners.