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1  Bitcoin / Bitcoin Discussion / [Quiz] Answer the Bitcoin question and earn merits! #4 on: June 06, 2024, 07:38:08 PM

It's been a while since I published a quiz. It's time for another one.  Smiley

- What's this?
Bitcoin quizzes are technical questions of educational character that improve the average user's knowledge on Bitcoin, and help him rank up. You can read more about it in here.

Answer the questions that follow and you will earn merits. We have talked a lot about probabilities, such as the probability of reversing a confirmed transaction, or probability of finding a block within the next few minutes, but it's time for another kind of puzzle.



Let's suppose that the network's difficulty is 42 trillion, about half of what's today.

  • The average block time of the current epoch (A) is 10 minutes, and we're close to the difficulty adjustment. Once we reach it, difficulty remains the same and we enter the next epoch.
  • The average block time of the next epoch (B) is 8 minutes, and another difficulty adjustment occurs, which increases the difficulty, so that the average block time returns back to 10 minutes.
  • The average block time of the next epoch (C) is 1 hour, due to a catastrophic decision made by the US government to seize all the miners.

What's the difficulty once it adjusts after epoch C?
2  Bitcoin / Bitcoin Technical Support / How does Bitcoin Core estimate the time left until synced? on: June 04, 2024, 07:08:02 PM
Given the current block height, and given the announced chain tip from other nodes, how does it estimate when it will finish syncing? There is no known time that it takes to verify a block. It can be filled with lots of complicated scripts like this one and take up to even 12 minutes, or just by one transaction which is a 4 MB long message, and thus can be verified very quickly.

What's the optimal approach? Average verification time of the past x blocks?

Edit: I'm trying to sync the testnet3. I've reached the recent spam phase, and it went from 89 minutes remaining to 100.  Tongue
3  Other / Meta / Is this forum getting worse and worse? on: May 21, 2024, 07:06:47 PM
I don't want to correlate this forum's comedown with the mixer ban, even though I've thought of it and it's likely one major factor, but what's the current picture of Bitcointalk according to you? To me, it's declining in genuine interest.

We're dealing with uninteresting topics. The "hottest" topic of discussion in the last months is Ordinals, followed by ETFs, and then an endless list of speculation-related threads, which were always a "thing" in the past, but gosh, that just seems like our sole concern nowadays.

Now, to that, add that we've lost valuable members, some of which were intellectually influential, and you have an Internet board filled with mostly crap. What's the problem?
4  Bitcoin / Bitcoin Discussion / What's the difference between Coinbase and an ETF? on: May 16, 2024, 03:05:34 PM
The main argument of the ETF is that it makes it more appealing to investors who don't want to hold their own coins, which I get it, to an extent. An investor may want to gain capital appreciation from Bitcoin long-term, without worrying about losing access to their keys. It's been also said that ETFs are convenient in terms of regulation.

Before Bitcoin, legislation is what protected your property. Examples following.

  • If you buy a car, and a thief steals it, you have all the papers to prove it belongs to you.
  • A thief can't just steal your house, because it's yours on paper.
  • You can't have your company stolen.

This "mechanism" attracts investors. An investor won't buy a million dollars worth of gold, to keep it to their basement. Instead, they would buy a promise of that gold, because in the end, all they want is the capital appreciation, not the gold per se. The real gold is guarded and kept on secure vaults, inside banks. A thief can't just steal that gold.

How certain can investors be for the security of a Bitcoin ETF? What's the difference between that, and a centralized exchange? Both are supposed to safeguard their setups, yet we frequently notice centralized exchanges suffering from cyberattacks, resulting in clients' funds being stolen.
5  Local / Ελληνικά (Greek) / Monero / XMR on: May 02, 2024, 12:13:40 PM
Συζητήσεις, απορίες και speculation περί Monero εδώ.


Το Μάρτιο, τα daily transactions έσπασαν all-time-high, 100 χιλιάδες: https://monero.observer/monero-daily-transaction-new-ath-100k/. Για μένα είναι ακόμα ασαφές το πόσο ασφαλές είναι το δίκτυο από de-anonymization επιθέσεις. Σίγουρα είναι πιο ανώνυμο απ' το Bitcoin, ακόμα και σε περίοδο επίθεσης λόγω stealth addresses και confidential transactions. Αλλά τα ring signatures είναι το ήμισυ (ανωνυμία του αποστολέα). Χωρίς αυτά, ναι μεν δεν υπάρχει linkability, αλλά μπορεί να υπάρχει traceability του κάθε output / coin.

Επίσης κάτι άλλο που δε μου αρέσει είναι ότι οι developers το έχουν κάνει σχεδόν ξεκάθαρο ότι θα υπάρξουν μελλοντικά hardforks, αν παράδειγμα σχεδιαστεί ASIC για Monero (για να αποθαρρύνει τους κατασκευαστές ASIC).
6  Bitcoin / Bitcoin Discussion / Samourai Wallet seized by the feds on: April 24, 2024, 07:57:19 PM
Samourai Wallet has been taken down by the U.S. authorities: https://www.justice.gov/usao-sdny/pr/founders-and-ceo-cryptocurrency-mixing-service-arrested-and-charged-money-laundering. You can verify by opening samouraiwallet.com (it's under the authorities' control).

Another privacy enhancing tool goes down the road. Apparently, the governments use everything in their disposal to undermine the users' privacy. Samourai team had recently announced that they were developing a decentralized version of whirlpool, using the Soroban network. It could be the case that they foresaw their own disappearance.

Very frustrated. An important reminder and good quote is needed here.
Quote from: satoshi
>You will not find a solution to political problems in cryptography.

Yes, but we can win a major battle in the arms race and gain a new territory of freedom for several years.

Governments are good at cutting off the heads of a centrally controlled networks like Napster, but pure P2P networks like Gnutella and Tor seem to be holding their own.

R.I.P. Samourai.
7  Bitcoin / Bitcoin Discussion / Do you think Bitcoin is fungible? on: April 23, 2024, 11:33:32 AM
I want to get an answer to this question from the community of Bitcoin.

The opinions on fungibility go like this:

  • No: Many places buy the "taint" nonsense and treat bitcoins unequally. Therefore, you might be discriminated based on your coins' history.
  • Yes: No matter the history, 1 BTC = 1 BTC, always. The protocol doesn't treat them differently, and we shouldn't interact with businesses that enforce this "taint" notion, which is evidently based on inaccurate fallacies.

I'm personally on the latter group. Third parties can treat them however they like. They're just losing me as client. Decentralized solutions treat all coins equally, as they should.

In the Monero community, there is a prevailing perspective that due to these businesses, Bitcoin is not fungible, and Monero is. My question is: have you ever paid a business that buys the "taint" nonsense with Monero? Does it make any sense to enforce this BS while accepting a completely private currency that you cannot track? In my view, if a business performs blacklists on my bitcoins, it absolutely doesn't accept Monero. You either accept both Bitcoin and Monero as fungible, or you blacklist the former and delist the latter (due to your inability to track it).
8  Bitcoin / Bitcoin Discussion / Important reminders on: April 21, 2024, 09:54:18 AM
I may be hated for saying this, but what's currently happening in the mempool is a feature, not a bug. The fact that we have a fixed-sized block limit means that the current clogged up state would inevitably happen sometime.

Another important reminder: Censorship won't prevent monkey jpegs. Let's leave asides if censoring monkeys would undermine one of the important properties: It just technically doesn't work. People who spend dozens of millions of dollars in monkeys everyday can bypass every censorship measure and save them straight to the UTXO set, which would be a lot worse for the rest of us.

Here's another: As long as the law of supply and demand defines the price of block bytes, we can never on-board billions or even millions of people on a layer-1 solution, unless we undermine another important property; being practical to verify the ledger.

Final reminder: The free market decides the ideal tradeoff. "Is it better to have a dynamical block size?", "Would it be worse if we traded 'being practical to verify' with 'being for the poor'?", "Would a tail emission save the situation?". These questions are not easy to answer. However, we have a lot of cryptocurrency options, each tailored to meet different needs. It's up to us to determine which option suits us best and to refrain from complaining about the shortcomings of a single solution.
9  Economy / Collectibles / MOVED: [WTS] Yu-Gi-Oh! - Starter Deck Kaiba (English) First edition on: April 16, 2024, 11:48:06 AM
This topic has been moved to Archival.

https://bitcointalk.org/index.php?topic=5488310.0
10  Local / Ελληνικά (Greek) / Είναι τα οικονομικά επιστήμη; on: April 14, 2024, 02:04:57 PM
Παλαιότερα πίστευα πως τα οικονομικά είναι σαν την πληροφορική, την ιατρική, τα μαθηματικά. Στην πληροφορική υπάρχει μια αντικειμενικότητα. Δεδομένου ενός input, παίρνεις ένα output. Αν μια θεωρία είναι συνεπής, τότε όλοι καταλήγουμε στο ίδιο συμπέρασμα. Και στην κοσμολογία, τα πράγματα είναι αντικειμενικά και βασίζονται κυρίως στις παρατηρήσεις και σε θεωρίες / μοντέλα που είναι συνεπή με τις παρατηρήσεις. Δεν είναι τυχαίο που όλοι καταλήγουμε στο ότι η γη είναι 4 δις χρόνων, π.χ.

Τα οικονομικά είμαστε σίγουροι ότι είναι σαν αυτές τις επιστήμες; Το λέω γιατί πρώτον υπάρχει άμεσα conflict of interest. Ένας τραπεζίτης μπορεί να είναι σπουδαγμένος, αλλά... είναι τραπεζίτης. Κατέχει μια εξουσία που πιθανώς δεν τον συμφέρει να αμφισβητήσει την ορθότητά του (ή της θεωρίας του).

Επίσης, με βάση τον ορισμό της επιστημονικής μεθόδου, το πρώτο κριτήριο για να χαρακτηριστεί μια εργασία επιστημονική, είναι να διαχωριστεί το πρόσωπο (εννοεί λογικά τον ερευνητή;) από το αντικείμενο:
Κριτήρια για να χαρακτηριστεί μια εργασία επιστημονική, είναι:

  • Διαχωρισμός του προσώπου από το εξεταζόμενο αντικείμενο.

Όταν το αντικείμενο είναι ο ίδιος ο άνθρωπος και τα μέτρα που πρέπει να επιβάλλει στον ίδιο για την ευημερία του, δεν ξεφεύγει λίγο το πράγμα;

Βγάζει περισσότερο νόημα να πούμε ότι δεν είναι επιστήμη, και γι' αυτό υπάρχουν και διάφορες σχολές οικονομικών (Αυστριακή, Κεϋνσιανή κλπ), χωρίς να υπάρχει μία που είναι απολύτως σωστή ή λάθος. Αυτές είναι οι σκέψεις μου, δεν ξέρω, μπορεί να είμαι λάθος.
11  Local / Ελληνικά (Greek) / Fun section | Spam fest on: April 08, 2024, 10:47:27 AM
Υπάρχουν πολλά αστεία βίντεο που ξεχνάω να τα αποθηκεύω, γι' αυτό αφιερώνω αυτό το νήμα σαν bookmark για όλα.  Tongue



https://youtu.be/coHC_9ApBdg

Μ' αρέσει να βλέπω debates με gold bugs τόσο πολύ.  Grin
12  Local / Ελληνικά (Greek) / Πώληση βιβλίων Bitcoin on: April 06, 2024, 10:41:10 PM
Αν κάποιος ενδιαφέρεται, πουλάω τα παρακάτω σαν πακέτο.

- Mastering Bitcoin: Programming the Open Blockchain 3rd Edition.
- Mastering the Lightning Network: A Second Layer Blockchain Protocol for Instant Bitcoin Payments 1st Edition.
- Mastering Monero: The future of private transactions Paperback.

Και τα τρία τα έχω διαβάσει και θα έλεγα πως είναι απ' τα πιο κατανοητά βιβλία για όποιον θέλει να ασχοληθεί με τα τεχνικά του Bitcoin (του Monero κάνει λιγότερη εμβάθυνση, αλλά στοχευμένη). Όλα έχουν ανέβει και δωρεάν απ' τους ίδιους τους συγγραφείς, είτε σε pdf είτε στο github. Εγώ απλά είμαι παραδοσιακός.  Tongue

Τιμή: 150,000 sat ή το αντίστοιχο ποσό σε XMR.
Αποστολή με BoxNow.
13  Local / Ελληνικά (Greek) / MicroStrategy και Coinbase on: April 03, 2024, 08:37:39 PM
Διάβασα κάπου ότι τα 210k BTC της MicroStrategy δεν τα κάνουν self-custody οι ίδιοι, αλλά τα έχουν αφήσει στην Coinbase. Ισχύει αυτό; Τι γνώμη έχετε; Ο Saylor γενικά φαίνεται άτομο που έχει καταλάβει τη δυναμική του Bitcoin και στάνταρ στακάρει ο ίδιος στο δικό του wallet, αλλά μου έκανε εντύπωση όταν το διάβασα αυτό.

Για ποιο λόγο να τα αφήνουν σε CEX όταν χακάρονται τόσα κάθε χρόνο; Αρνούμαι να πιστέψω ότι θεωρούν πως ένα περιποιημένο multi-sig προσφέρει λιγότερη ασφάλεια απ' το να εμπιστευτούν έναν απ' τους πιο anti-Bitcoin οργανισμούς που υπάρχουν. 
14  Bitcoin / Bitcoin Discussion / [Quiz] Answer the Bitcoin question and earn merits! #3 on: March 31, 2024, 12:48:15 PM

Bitcoin quizzes are technical questions of educational character that improve the average user's knowledge on Bitcoin, and help him rank up. You can read more about it in here.

As of today, we acknowledge the probability of a malicious pool turning evil, attempting to reverse your transaction with 10 confirmations. We are also aware that the probability of finding a certain number of blocks within a certain time frame follows the Poisson point process, which is a random mathematical object consisting of points distributed independently of each other within a space.



Question: At the time of writing this, a rich billionaire decides to purchase lots of unused, available ASICs manufactured by Bitmain, with the intention to attack the network. He has acquired so much computational power, that he, alone, can generate 300 EH/s (exahashes per second). Once his setup is done, he turns his ASICs on and attempts to reorg the chain. Assuming that the rest of the hashrate remains constant, how many confirmations do you need to be 99% certain that your transaction will not be reversed by the attacker, and why?
15  Local / Ελληνικά (Greek) / EU: Παράνομες οι συναλλαγές από non-custodial wallets on: March 23, 2024, 05:44:26 PM
Απ' ότι φαίνεται, θα είμαστε επίσημα εγκληματίες μέσα στα επόμενα τρία χρόνια: https://twitter.com/echo_pbreyer/status/1770853127798861868.

Όπως καταλαβαίνετε, είναι γελοίοι οι άνθρωποι, αλλά ήταν θέμα χρόνου μέχρι να γινόταν. Το να ασχοληθούν με καθέναν από εμάς που χρησιμοποιεί BTC και XMR σαν peer-to-peer cash, λίγο δύσκολο, όπως δύσκολο είναι και με τα μετρητά. Αυτό που θα καταφέρουν, τουλάχιστον όπως το βλέπω εγώ, είναι να αποθαρρύνουν καταστήματα στο να τα δέχονται σαν μεθόδους πληρωμής.
16  Bitcoin / Bitcoin Discussion / [Quiz] Answer the Bitcoin question and earn merits! #2 on: March 20, 2024, 11:14:28 AM

Short introduction for anyone who missed the first quiz:
I decided to start these forum quiz-series, where I'll be asking questions of educational character, to improve the average user's knowledge around Bitcoin. The questions will mostly be technical and historical. To create an incentive, I will generously merit the first person who replies with the correct answer. If that is not good enough incentive, I'll create a leaderboard!

  • Your answer needs to be explanatory. Not just a yes-no or a single number.
  • If nobody finds the answer until the cut-off date, I will submit it.
  • Have fun! It's a game.  Smiley

The first question was a tribute to the whitepaper. Now let's see how good we are at math.



Question: What is the chance of having exactly three blocks mined within the next 10 minutes? You can assume that a new block is mined every 10 minutes on average.

Cut-off date: 27/03/2024.
17  Bitcoin / Bitcoin Discussion / [Quiz] Answer the Bitcoin question and earn merits! #1 on: March 16, 2024, 09:03:18 PM

I decided to start these forum quiz-series, where I'll be asking questions of educational character, to improve the average user's knowledge around Bitcoin. The questions will mostly be technical and historical. To create an incentive, I will generously merit the first person who replies with the correct answer. If that is not good enough incentive, I'll create a leaderboard!

  • Your answer needs to be explanatory. Not just a yes-no or a single number.
  • If nobody finds the answer until the cut-off date, I will submit it.
  • Have fun! It's a game.  Smiley



Question: The dominant mining pool, at the time of writing this, turns evil and uses its hash-power to reorg the chain. A customer of yours sends you a transaction. If you wait for 10 confirmations, what is the chance that the dominant mining pool successfully double-spends / reverses your transaction?

Cut-off date: 23/03/2024.
18  Other / Archival / [WTS] Yu-Gi-Oh! - Starter Deck Kaiba (English) First edition on: March 10, 2024, 02:42:46 PM
I've decided to offer a very collectible Yu-Gi-Oh item of mine for sale. The very first Seto Kaiba deck released in the known Trading Card Game for the enthusiasts. Cards are in Mint and Near-Mint conditions.



(You can open an image in new tab to see it in full resolution)

It appears to be the case that there is no Starter Deck Kaiba 1st edition in English apart from factory sealed (which can worth beyond $5000, such as this one). If you search on Ebay and Cardmarket, you might find it in Portuguese, Asian, German and Italian, but no second-handed in English.

For this reason, I'll price it at 500 EUR, which is about 1/10th of the factory sealed. Please note that the current collectible is European product and not North American. That's why each card's number is SDK-EXXX and not SDK-XXX. Also, take into consideration that the box (for reasons yet unknown to me) does not display "First Edition" on the top, while the cards are in first edition. I would be glad if you found and shared another offer about second-handed SDK 1st edition in English. As far as I've searched, there is none.

  • I only accept BTC and XMR.
  • You'll have to pay any shipping costs, especially if you're outside the EU.
  • I can provide you more pictures if you're interested.
19  Bitcoin / Bitcoin Technical Support / Extremely slow reindexing on: February 09, 2024, 12:14:18 PM
Bitcoin Client Software and Version Number: Bitcoin Core 26.0
Operating System: Raspbian Lite OS (64-bit)
System Hardware Specs: 4 GB memory, 2 TB external HDD.
Description of Problem:

TL;DR: I switched disks, and somehow either the blocks or the chainstate got corrupted, and I had to reindex. I'm one week now, at progress=0.313028. It seems like it goes much slower now. Yesterday it was in 0.30. At this rate, it will take more than a month to reach the tip. I was thinking if it's possible to eject the HDD, plug it a computer with better specs, so it could finish... this month. It should be possible to do, right? The disk is loaded with Raspbian, so I could theoretically load it during boot in any other machine.

(Asking just in case I don't mess things up)
20  Bitcoin / Bitcoin Discussion / The Times 03/Jan/2009 - High quality image? on: January 15, 2024, 06:59:36 PM
I'm searching for a high quality image of the popular The Times newspaper. The best one I've found is this: https://talkimg.com/images/2024/01/15/3fefd.png. Is there in higher quality? I was thinking of making a poster, like this one.
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