This is a really good insight that I wasn't aware of, thank you for this information o_e_l_e_o! I wonder if one could hypothetically translate the 51 % hashrate into actual numbers such as number of GPU's that would need to be working, electricity that one had to "waste" in order to revert the attack. I wonder, at the present time, how many hashrate would have to be employed to revert a transaction in BTC? Is there any graph that I could use to extract this information from?

One attack scenario against the consensus mechanism is called the "51% attack." In this scenario a group of miners, controlling a majority (51%) of the total network’s hashing power, collude to attack bitcoin. With the ability to mine the majority of the blocks, the attacking miners can cause deliberate "forks" in the blockchain and double-spend transactions or execute denial-of-service attacks against specific transactions or addresses. A fork/double-spend attack is where the attacker causes previously confirmed blocks to be invalidated by forking below them and re-converging on an alternate chain. With sufficient power, an attacker can invalidate six or more blocks in a row, causing transactions that were considered immutable (six confirmations) to be invalidated. Note that a double-spend can only be done on the attacker’s own transactions, for which the attacker can produce a valid signature. Double-spending one’s own transactions is profitable if by invalidating a transaction the attacker can get an irreversible exchange payment or product without paying for it.

See example if you are interested in

So why this article claims reversal is possible?

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Reference:
[1] How does mining works

Payments with 0 confirmations can still be reversed! Wait for at least one.

One way to think about the blockchain is like layers in a geological formation, or glacier core sample. The surface layers might change with the seasons, or even be blown away before they have time to settle. But once you go a few inches deep, geological layers become more and more stable. By the time you look a few hundred feet down, you are looking at a snapshot of the past that has remained undisturbed for millions of years. In the blockchain, the most recent few blocks might be revised if there is a chain recalculation due to a fork. The top six blocks are like a few inches of topsoil. But once you go more deeply into the blockchain, beyond six blocks, blocks are less and less likely to change. After 100 blocks back, there is so much stability that the coinbase transaction—the transaction containing newly mined bitcoin—can be spent. A few thousand blocks back (a month) and the blockchain is settled history, for all practical purposes. While the protocol always allows a chain to be undone by a longer chain and while the possibility of any block being reversed always exists, the probability of such an event decreases as time passes until it becomes infinitesimal.

So i can set 10 sat/byte.

If transaction not confirmed then it will return back to my wallet in 7 to 14 days. Then i can try with 10 sat/byte....
Is there any chance of stuck or not return?

I have a friend who found a way to make money with 0-confirmations spending, I know is not ethical but it is working and I wonder what are the legal risks?

Theoretically if you send with a very small fee, the funds will never arrive to the destination, the transaction will be reverted. So you can't be left without a deposit because the funds will arrive back, the worst you can have it blocked for a few days

This adds the functional test mempool_expiry.py covering mempool transaction expiry. Both the default DEFAULT_MEMPOOL_EXPIRY of 336 hours (two weeks, set in #9312) and the user definable mempool expiry via the -mempoolexpiry=<n> command line option are tested. The test checks that descendants of expired transactions are removed as well.

Notes for reviewers

LimitMempoolSize() (which is the only caller of CTxMemPool::Expire()) is only called when a transaction is added to the mempool. In order to test expiry of a transaction-that-should-expire, the mocktime is set and a random transaction is broadcast to trigger LimitMempoolSize(). The transaction-that-should-expire is then checked for expiry. LMK if there is another way, but I don't think there is.

I have one idea, but I suspect that it will be quite difficult to implement it at the level at which I see it. I am interested in any examples of beautiful threads, threads with a complex code structure are fine too. At the same time, this thread can become a single place where anyone can find cool thread patterns for themselves and learn more (by understanding the structure of the code).

Then read article saying 'no full node = might not be your coins'.

I don't have the knowledge (or computing space) to run a full node.

How much of an issue could this be for me and is there any way to verify the coins are legit and in my cold storage.

Warning: Electrum versions older than 3.3.4 are susceptible to phishing. Do not download Electrum from another source than electrum.org, and learn to verify GPG signatures.

1) Do they let your trade without KYC? What's the requirement like for their .com? I heard you can trade €5,000 worth of BTC a day without the need to KYC? Is this still the case?

Identity Verification

Before you can start trading on Binance P2P, you need to complete identity verification, also known as KYC (Know Your Customer). KYC assures that users trade with their authentic identities, and Binance reserves the right to investigate.

To trade OTC, your Binance account needs to be verified.

If you have not completed the identity verification for your account, your withdrawal limit is set to 2 BTC for every 24 hours.

2) If so, then is it something that they say but later freeze your account with KYC demands even though you kept it under 5k and you didn't break their rules? I mean, sure it "could" happen, but is it common with them?

1. Suspension of Binance Accounts
2. Cancellation of Binance Accounts

3) What are the requirements to do so - name, phone number, email only?

4) Can you trade as soon as you sign up (no KYC level)? How long is the signing up process? Does it require approval? Can you sell directly to them?

5) Do they need KYC to withdraw?

6) Is it safe to get referral codes from strangers and use it to sign up?

I already use RSI,BB,MACD and %BB which are quite accurate, but I'm wondering... what is the best indicator to catch a coin that it practically going up and down?

Impression counts for ads over years (Statistics) (last update July 2020).

The related information that is aligned with what you require is that on Unique IPs from logged-out users and Unique logged-in users over a given period of time.

According to https://blockchair.com/bitcoin/charts/segwit-usage, SegWit usage is about 45%-50%, so it's not that bad. I think people still show legacy address because they don't want bother with user who use bad wallet.

I think you need to read the quote below. I use VPN on binance app and it worked, what many exchanges will disable, which means you will not be able to access with VPN on such VPN-disabled exchanges like HitBtc. I use trading app often, I do not know about their websites.

Since Bitcoin transaction fees are priced in sats, then obviously as bitcoin's price rises the fee also becomes more "expensive".

Now, is it a problem? Sure. But it's really mostly not mostly Bitcoin's fault.

In order to save transaction fees, you need to have a good strategies and solid plans.

Strategies

• Consolidate your small inputs when fee rate is cheap, as a preparation for your bitcoin transaction later (with a single or less inputs) when fee rate is higher. See the guide from LoyceV
• Try to use Segwit address (Bech32 address - bc1): it helps you to reduce transaction size that in turn help you to reduce transaction fee (at same fee rate)
• Have clear plans to move your bitcoin (when - hours, days, bi-weekly). See that topic on weekend effects

Plans

• Weekends are best days to move bitcoin: Sundays usually give cheaper fee rates than Saturday. See details
• Hour frames from 0 to 12 UTC are best to move bitcoin. See details
• Within a day, avoid hours of funding rate on BitMEX. The daily BitMEX broadcast at 13:08 UTC

1. Blockchain.com, Binance, and a few other exchanges/wallets still doesn't have SegWit support.

2. A lot of people in general still doesn't use SegWit. I'm still seeing a good number of legacy Bitcoin addresses(outside address staking) being used here on Bitcointalk.

3. Lightning network is pretty decent now, but unfortunately most exchanges still doesn't support them though some exchanges vowed to support Lightning this year.

4. A lot of times, people simply just unnecessarily overpay transaction fees because of the really inaccurate fee recommendation of the wallet they're using.

1. Suspension of Binance Accounts
You agree that Binance shall have the right to immediately suspend your Binance Account (and any accounts beneficially owned by related entities or affiliates), freeze or lock the Digital Assets or funds in all such accounts, and suspend your access to Binance for any reason including if Binance suspects any such accounts to be in violation of these Terms, our Privacy Policy, or any applicable laws and regulations. You agree that Binance shall not be liable to you for any permanent or temporary modification of your Binance Account, or suspension or termination of your access to all or any portion of Binance Services. Binance shall reserve the right to keep and use the transaction data or other information related to such Binance Accounts. The above account controls may also be applied in the following cases:

• The Binance Account is subject to a governmental proceeding, criminal investigation or other pending litigation;
• We detect unusual activities in the Binance Account;
• We detect unauthorized access to the Binance Account;
• We are required to do so by a court order or command by a regulatory/government authority.

2. Cancellation of Binance Accounts
In case of any of the following events, Binance shall have the right to directly terminate these Terms by cancelling your Binance Account, and shall enjoy the right but not the obligation to permanently freeze (cancel) the authorizations of your Binance Account on Binance and withdraw the corresponding Binance Account thereof:

• after Binance terminates services to you;
• you allegedly register or register in any other person’s name as a Binance User again, directly or indirectly;
• the information that you have provided is untruthful, inaccurate, outdated or incomplete;
• when these Terms are amended, you state your unwillingness to accept the amended Terms by applying for cancellation of your Binance Account or by other means;
  you request that Binance Services be terminated; and
• any other circumstances where Binance deems it should terminate Binance Services.

The chart shows that, on average, the Ethereum blockchain is busiest from 1 PM UTC to about 6 PM UTC, corresponding approximately to the early U.S. trading session between 8 AM EST and 1 PM EST. This is likely no coincidence, as during this time window both Europe and the U.S. are fully awake and at work.

By contrast, the least busy period is between 9 PM UTC and 11 PM UTC. This also makes sense — The U.S. workday is coming to a close, Europe is getting ready to sleep, while in Asia it is still very early in the morning. In addition to lower average values, the evening UTC period also sees fewer outliers.

In the last 30 days

• Gas_used around 60k combines with gas_limit around 200k⁺ (p75) look to be good for confirmations.
• Hour-frames from 7 to 10 UTC are likely best.
• Hour-frames from 20 to 23 UTC are likely worst.
• Sunday is the best day (in median). Next one is Thursday (in gas_used, gas_limit) with median, IQR, and p75 values.

In order to save transaction fees, you need to have a good strategies and solid plans.

Strategies

• Consolidate your small inputs when fee rate is cheap, as a preparation for your bitcoin transaction later (with a single or less inputs) when fee rate is higher. See the guide from LoyceV
• Try to use Segwit address (Bech32 address - bc1): it helps you to reduce transaction size that in turn help you to reduce transaction fee (at same fee rate)
• Have clear plans to move your bitcoin (when - hours, days, bi-weekly). See that topic on weekend effects

Plans

• Weekends are best days to move bitcoin: Sundays usually give cheaper fee rates than Saturday. See details
• Hour frames from 0 to 12 UTC are best to move bitcoin. See details
• Within a day, avoid hours of funding rate on BitMEX. The daily BitMEX broadcast at 13:08 UTC

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I will make a summary table and edit this post. Stay tuned!

I hope these tables give you better data presentation.

• You can see weekend and working-hour effects
• Important note: % of difference here is between median. For your interest, if you use non-custodial wallet, and customize your fee rate, you can get much bigger fee-discount.
• My own findings match with The daily BitMEX broadcast at 13:08 UTC. In my table how the % suddenly increases to 33% at 13 UTC hour frame

Methodology

• Intra-week
  
  • Weekly median: median transaction fees for all transaction within specific week
  • Daily median: median transaction fees for all transactions of each days in a specific week
  • Difference (in %): [ daily median - weekly median ] / weekly median *100.
  • Stats in the table is mean of difference (all observed weeks)
• Intra-day
  
  • Daily median: median transaction fees for all transaction within specific day
  • Hourly median: Median transaction fees for all transactions of each hour in a specific day
  • Difference (in %): [ Hourly median - daily median] / daily median *100
  • Stats in the table is mean of difference (all observed weeks)

Hi ,  Why Cant Bitcointalk Introduce their Own coin , why still using Bitcoin to buy their Copper membership ??
I think it will be easy for all if we can use their own coin to buy their copper membership , Isn't it ??

How many of you use "Crypto Prediction Applications" for trading?

You see, for the past few days I've being trying out some of "crypto prediction apps" but I haven't been lucky.