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1  Local / Anfänger und Hilfe / How to kill Bitcoin [Mai 2020] on: May 21, 2021, 04:01:06 PM
Um aus aktuellem Anlass etwas FUD zu schüren:

Kann mir jemand erklären wo bei How to kill Bitcoin (von Mai 2020) der Haken ist?
Vielfalt an Kryptowährungen und alternative Proof of Work Algos helfen gegen so eine Attacke nur bedingt Wink

https://joekelly100.medium.com/how-to-kill-bitcoin-part-1-is-bitcoin-unstoppable-code-7a1b366f65ee (Teil 1)
https://joekelly100.medium.com/how-to-kill-bitcoin-part-2-no-can-spend-66e59385a4a5 (Teil 2)

Also klar, es gilt zu diskutieren, ob ein Staat überhaupt in Erwägung zieht Bitcoin derart anzugreifen, aber alles eine Frage des Einflusses und des Schadens auf andere Bereiche.
Tatsächlich genügt ja ein einzelner mit hinlänglich Budget aus, der die Schnauze voll von dem Treiben hat.

Auch in Bezug auf diesen Angriff interessant: https://github.com/mikekelly/btc-endgame

BTC endgame is a research project aiming to test defensive strategies of the Bitcoin network under various attack scenarios, via a wargame.

--

Gegenposition:
https://jimmysong.medium.com/debunking-the-empty-block-attack-10513858b3f8

Der erste Kommentar entkräftet aber das "Debunking" m.M.n. wieder:

First, replace "empty blocks" with "clean blocks" (i.e. blocks only containing compliant whitelisted transactions). Second, replace "China" with "FATF". Third, replace "Bitcoin killed" with "Bitcoin castrated". Having done these replacements, you suddenly get an attack that is much more realistic and defies all the arguments brought forward in your article.
FYI, this attack is about to begin: https://stockhouse.com/news/press-releases/2020/10/29/dmg-s-subsidiary-blockseer-launches-bitcoin-mining-pool-focused-on-good
2  Local / Presse / [2021-05-20] NY Times Opinion - Technobabble, Libertarian Derp and Bitcoin on: May 21, 2021, 03:24:29 PM
https://www.nytimes.com/2021/05/20/opinion/cryptocurrency-bitcoin.html
3  Economy / Service Discussion / bitrefill.com holding back refund in LTC since 21-05-03 [resolved 21-05-10] on: May 07, 2021, 11:12:31 AM
Hey guys,

so I was planning to buy an Amazaon gift card worth of 650€ in LTC on Monday on bitrefill.com.
First thing I noticed was, that the website was pretty slow that day.
Their web system seemed overloaded and I already had an HTTP request result in an error while browsing their offers, but I still proceeded with my order as I was in a bit of a hurry.

I sent 2.84 LTC to my LTC Core wallet from an exchange (slightly more than the 650€ at that time just to be sure I can fulfil their order).
I checked out my order and right at the start of the 30-minute time window I sent the requested 2.779347 LTC to the address associated with the order.
Unfortunately the incoming LTC payment wasn't recognized by their system in time (possibly due to server overload), so the 30 minutes window timed out without the sent LTC being recognized.

Afterwards I got notified via e-mail, that I'm eligible for a refund, as the 2.77 LTC arrived late in their systems.
At this point I entered the same LTC address I used for the payment as destination address for the refund.
The HTTP request for the refund resulted in another web server error and no refund was issued on the LTC blockchain.
Also, I am not able to request a refund again as the order is flagged as already refunded in their system.

I also tracked in a blockchain explorer, that my payment was collected from the LTC address I payed towards bitrefill's Kraken account, which happened about 7 hours after the payment.

So of course I immediately wrote a support inquiry to support@bitrefill.com.
I had an interaction with a support person after posting on their reddit on Wednesday, and they told me they escalated to management and informed their tech team.
But now another 2 days have passed and I didn't hear anything from them.

It's 4 days now since I'm waiting for my 2.779347 LTC.
I provided them the option to call me on my mobile number to clarify stuff.

Does anyone have similar experiences with bitrefill.com during the last week?
I understand that these are busy times and it was probably a peak in service demand due to the bull market, which might have led to the timed out web server requests.
Still I expect them to deal with customer funds responsibly even if technical issues occur.
Soon it will be a full week without having a refund or at least an estimate for when it will occur.

Can provide screenshots with some personal information censored, if there are any doubts.

@bitrefill, ticket number is 67246 for reference.
4  Local / Presse / [2021-04-29] Kriminalität: US-Experten fordern stärkere Regulierung von Kryptow. on: April 29, 2021, 09:26:59 AM
https://www.spiegel.de/netzwelt/kriminalitaet-us-experten-fordern-staerkere-regulierung-von-kryptowaehrungen-a-827281e0-2afd-4334-8b4a-4fe1488842de

Die digitale Entführung von Computern ist bei Hackern derzeit groß in Mode. Fahnder wollen dem Treiben jetzt Einhalt gebieten – durch neue Vorschriften für Kryptowährungen.
5  Economy / Trading Discussion / Why isn't anyone arbitraging Korean exchanges? on: January 29, 2018, 11:39:57 PM
It's pretty well-known, that most cryptocurrencies are traded at higher prices on Korean exchanges such as Bithumb and Upbit in the Crypto/KRW pairs. Compare for example the XRP prices across exchanges.
This got especially popular when CoinMarketCap removed Korean exchanges from its price averaging, leading to a small flash crash of the whole market.

What's the reason for this and why isn't it exploited by arbitrage traders? Is withdrawing KRW a problem?
6  Alternate cryptocurrencies / Altcoin Discussion / Where would you park your crypto in case of a goxxening of Bitfinex? on: November 21, 2017, 08:58:04 PM
Let's assume signs are clear that a severe crypto crisis is at the doorsteps.
Some people already see it coming.

Also assume for various reasons you aren't able to convert to fiat.
Which cryptocurrency would be the most stable in case of such a severe BTC crash (say 90-95% price drop) and Tether wipeout?

ETH? XRP? BCH? What do you think?
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