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1  Local / Ελληνικά (Greek) / Re: Επενδυτές on: December 04, 2020, 12:46:51 PM
Ένας επενδυτής θέλει, συνήθως, να γνωρίζει που θα επενδυθούν τα λεφτά του και πως θα τα πάρει πίσω.
Αν δεν μπορείς να αναφερθείς στο 1ο τουλάχιστον γράψε για το 2ο.
2  Bitcoin / Electrum / Re: Need Information about Electrum on: December 04, 2020, 12:38:21 PM
Q1. As long as you stay off internet is safe.

Q2. read this for cold storage and how to sign transactions

https://electrum.readthedocs.io/en/latest/coldstorage.html?highlight=usb



I am using electrum for sometime but today first time joined just because I need some information about Electrum wallet.

I have 2 computers and one is connected to Internet and other is not which is not connected I have Electrum Wallet and storing my coins for long term is this safe way to have coins in this wallet and connecting only when I have to transfer coins.

Second question can I transfer my coins without connecting internet if someone can guide me this could be great because I don't want take any risk with these my coins.

3  Bitcoin / Electrum / Fake Electrum version 4.0 and hardware wallets on: August 24, 2020, 06:09:35 PM
I'm just wondering if someone downloaded the fake version and tried to use it with his hardware wallet.
Is someone here who did it accidentally (or on purpose) to tell us if his hardware wallet protected (or not) his coins?
4  Bitcoin / Hardware wallets / Re: Ledger hacked or not? 100k lost on: August 24, 2020, 05:58:27 PM
Is it possible a fake MEW to compromise Ledger (without entering somehow the seed)?
Ledger is supposed to sign transactions even to infected PCs....


It is possible that he used a fake MEW or something like that, that could lead to some other exploit similar to that one from last week:
https://support.ledger.com/hc/en-us/articles/360015738179

I don't know if the two incidents are related.

I am worried about my ledger now....
5  Bitcoin / Development & Technical Discussion / Bitcoin, cryptos and the imminent threat of a Quantum Computer on: June 07, 2020, 01:05:14 PM
Many of us have heard about the Quantum Computer (QC).
Although it has been on an experimental stage yet, it is a matter of time to be built.
In one of his speeches, Antonopoulos said that a full working QC could have been in full function within the next decade.

So, when this happen, a QC could be a risk regarding all cryptocurrencies in the market.

Furthermore, to be more specific about what a QC is capable of it is that, a QC could mine all the rest coins in a few minutes, maybe, and break the keys of all the addresses.

Some people believe that there are more interesting fields for a QC to be used like medical research, industrial secrets, espionage (in general), than just have it for cryptos which it could meant extra time for us to get prepared for what is coming next.

In this forum, I have read many times about quantum resistant wallets / blockchain (whatever could be utilized to protect us). However, I have never heard of computer engineers able to develop a defence system, or any BTC team that would be ready to confront a possible QC threat.

Additionally, in case of a QC and a successful Quantum resistant ecosystem, a QC would allow somebody to break the keys of all the owners’ “lost” addresses because they themselves will not be able to change them on time to the new ecosystem field.
The “lost” coins (BTC or crypto) could be used again, contributing to the price.

Please, just imagine the scenario:
1 million or more BTC available in the exchanges, simultaneously!
BTC’s price, and the crypto ecosystem, could collapse instantly by selling  in a ridiculous cheap price.
This is the bad scenario.
A good one is, that the new owners could sell them, one by one, for fiat, to get rich, or to finance their QC research.

Do you think that all these could ever be a reality?
In my opinion, we are not allowed to think otherwise or ignore it.

It reminds me as I am thinking of the QC, the Enigma Engine and “Bombe”, the computer built by Alan Touring, who broke the German code.
Its existence was a top-secret and was finally revealed many decades later, in the ‘70s...
6  Bitcoin / Wallet software / Re: Openbazaar's wallet on: January 30, 2020, 06:03:47 PM
I would like to thank all of you, OmegaStarScream & DaveF for the very simple solution (using the electrum wallet) and o_e_l_e_o for explaining me how BIP44 works.
Thank you very much.
7  Bitcoin / Wallet software / Openbazaar's wallet on: January 30, 2020, 10:47:52 AM
I've recently bought an item on Openbazaar and after paying, I wanted to withdraw the rest BTCs to my wallet.
I couldn't do it from the Openbazaar's wallet because of "insufficient balance" so I thought I could sweep the rest to my mobile wallet.
So, I inserted the seed to Ian Coleman's web page (offline, downloaded from Github) to search for the private key of the change address (I know the address from the transaction).
The 1st address, of the list, was the one I bought the item.
I've browsed several hundred addresses (one buy one and using ctr-F) without finding the changes address (however the BTC is there, but where)...

Any ideas ??
8  Bitcoin / Development & Technical Discussion / Re: 51% Attack on: January 24, 2020, 05:43:15 PM
Long before they collect the ASICs for the attack, the government will realize that they can make money mining Bitcoin.
So if they could spend so much money, I thing they would continue the mining and not attacking.
So I believe it is not a possible scenario...

Following scenario: A government would like to destroy Bitcoin. It buys a significant number of ASICs to build up a huge mining farm and carries out a 51% attack.
From my point of view it will not be so easy to buy so many ASICs as once - what do you think?
Another question: Will it be noticed (how?) that somebody buys a big stack of ASICs and/or are we able to identify such a behavior monitoring the network's hashrate?
9  Local / Ελληνικά (Greek) / Re: Καλή Χρονιά! :) on: January 05, 2020, 05:58:12 PM
Καλή χρονιά με υγεία, παιδιά.
10  Other / Ivory Tower / Re: Where greed comes from? on: December 05, 2019, 08:07:50 PM
Actually some animals (primates) have a human-like behaviour when they are trying to find their "position" in their community or want to become the leaders of the team.
The following video is not the one I was searching for, but it can give you an idea of ​​what I mean.

https://www.youtube.com/watch?v=Fv71JevtR-0


Quote
They don't know that. The percent doesn't matter, the concept of greed has to do with the desire for excess.

Last time I checked we classified animals as creatures acting upon their instincts not making conscious decisions. Desire is a "Conscious" thing iyam. Doesn't really fit in with the animals, Either it's instinct or they are making "Conscious" decisions.

Quote
However, when deceiving and cheating people becomes a dominant behavior, that elicits a negative feedback loop, then it truly does become more destructive than instructive.

I think we are currently living in this "deceiving and cheating" world.
11  Other / Off-topic / Re: I bought my 10 year daughter a Ledger Nano S, not sure if it's the right move. on: December 05, 2019, 07:36:04 PM
I would buy her a piggy bank, in order to learn how to hodl.
Even if she is good in PCs, I believe she is too young for cryptos.
12  Bitcoin / Wallet software / Re: How to Choose the Best Crypto Wallet to Suit your Needs on: December 05, 2019, 07:16:47 PM
You can also do the "wallet" test in bitcoin.org webpage.
The webpage lists the best wallets to date.
13  Local / Ελληνικά (Greek) / Re: [INFO] Συζήτηση για την Ισοτιμία on: November 07, 2019, 04:39:19 PM
Δεν είμαι trader και όσες φορές το προσπάθησα απέτυχα με μεγάλες απώλειες.
Αντιπαραθέτω όμως εδώ το γνωστό διάγραμμα από την σελίδα του @hcburger1 στο οποίο φαίνεται καθαρά πως στα δυο τελευταία halving (κάθετες μαύρες γραμμές) η τιμή του BTC ήταν κοντά στην γραμμή στήριξης (κόκκινη γραμμή).

Πιστεύω ότι θα έχει ενδιαφέρον να δούμε αν το διάγραμμα σε έξι μήνες επαληθευθεί ξανά και η τιμή θα κινηθεί και πάλι εκεί κοντά (6-7Κ USD)



Τώρα κάτι άλλο που θέλω να γράψω αν και δεν μου αρέσει να κάνω προβλέψεις της ισοτιμίας αλλά πλέον έχουμε  ακριβώς την ίδια συμπεριφορά με μικρές αποκλίσεις όπως και το προηγούμενο halving έχουμε δλδ μια μείωση μετά το σκάσιμο του bubble στο 20-30% της ισοτιμίας του ATH και σταθεροποίηση όπως έγινε και πριν στο μισό του ATH.
Δλδ όπως και τώρα βλέπουμε μια σταθεροποίηση γύρω από τα 10k με 1k πάνω κάτω, σταδιακά μπορεί και περισσότερο λιγότερο αλλά κατά μέσο όρο σε αυτά τα επίπεδα κινούμαστε.
Λογικά θα κινηθούμε έτσι για τους επόμενους μήνες ενώ 2 με τρεις μήνες πριν το halving θα δούμε άνοδο καθώς θα χτίζονται προσδοκίες για το halving και αμέσως μετά το halving μια διόρθωση ενώ από τον Αύγουστο θα αρχίσει να χτίζεται το νέο bubble που όπως και πριν θα συμβεί ένα χρόνο μετά δλδ το 2021 προς τις γιορτές.
Τώρα δεν έχω έρθει από το μέλλον αλλά έτσι έχει γίνει σε όλα τα προηγούμενα halving του Bitcoin Tongue
Φυσικά bitcoin είναι μπορεί να γίνει ότι νάναι γιαυτό δεν είναι επενδυτική συμβουλή με τπτ
14  Local / Ελληνικά (Greek) / Re: YTC (YELLOW TRADING COIN) ΝΕΑ ΑΠΑΤΗ; on: October 18, 2019, 02:29:46 PM
Ο μεγαλύτερος εχθρός της άγνοιας είναι η μελέτη.
Από τότε που εμφανίστηκε το Bitcoin πέρασαν 10 χρόνια. Αν θελήσεις να ασχοληθείς με τα κρυπτονομίσματα έχεις πολλά να διαβάσεις για να καλύψεις το κενό.
Τρία πράγματα πρέπει να θυμάσαι πάντα:
- Κανείς δεν σου χαρίζει τίποτα δωρεάν.
- Πρόσεχε πολύ πριν δώσεις οπουδήποτε τα λεφτά σου.
- Μην διστάσεις να ρωτήσεις εδώ το οτιδήποτε.
Δεν είμαι ειδικός αλλά εδώ υπάρχουν πολλοί που μπορούν να σου λύσουν τα περισσότερα προβλήματά σου.

Βλέπω ότι είστε αρκετά έμπειροι και σας ευχαριστώ όλους για τη βοήθεια! Κάτι ακόμη που μου επιβεβαιώνει ότι πρόκειται για απάτη, είναι ότι αν ήταν κάτι αξιόλογο, ΤΟΥΛΑΧΙΣΤΟΝ θα το είχατε ακούσει.
15  Other / Beginners & Help / Re: Don't run for merits! on: October 17, 2019, 02:28:58 PM
Opportunities?
Don't expect to make a lot of money from signature Bounties.
ICOs time is over.
2-3 years before it was much different.

On this forum, Merit provides great opportunities, so everyone wants it.
16  Bitcoin / Development & Technical Discussion / Re: Is it possible to generate every address from one seed on: October 17, 2019, 01:47:58 PM
Is it possible to calculate (theoretically) , how many common addresses could derive from the seeds?

If there are 2048^12 different seed combinations (in 12-word BIP39) and each has  2^256 keys then we have 6.3X10^116 different addresses.
We have altogether in Bitcoin 2^160=1,46x10^48 different addresses, which is a smaller number than the first one.

How many of them are common?

I would like to know is there a limit to how many bitcoin public keys be generated using one seed phrase. Is it unlimited?
It is unlimited

Quote
If it's not limited then this would mean that wallets with different seeds would cause a clash of their addresses. Am I right?
You really gave a good point however I think there must have an explanation. I will wait for others answer.

As pooya said it is limited to 2^256 (in practical terms only 255)

However this is a very big number.

Every seed can create billions of addresses in each derivation path. That means billions of addresses in change addresses, in legacy, segwit, native segwit, etc etc

A collision , which is what you are talking about is impossible in practical terms. Billions of addresses randomly generated is hard for our minds to understand.


From antonopoulos mastering bitcoin:

Quote
https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch05.asciidoc#navigating-the-hd-wallet-tree-structure

The HD wallet tree structure offers tremendous flexibility. Each parent extended key can have 4 billion children: 2 billion normal children and 2 billion hardened children. Each of those children can have another 4 billion children, and so on. The tree can be as deep as you want, with an infinite number of generations.

17  Other / Meta / Re: Possible to view Recent Posts from selected boards only ? on: October 16, 2019, 03:43:05 PM
I don't know if it the answer you are expecting, but try to add this ending after your link:

;sort=first_post;desc

EXAMPLE:

This link --------> https://bitcointalk.org/index.php?board=238.0

to this one ----------> https://bitcointalk.org/index.php?board=238.0;sort=first_post;desc

I was planning to lurk the forum to see what all is going around by going through posts on the "Recent Posts" page (https://bitcointalk.org/index.php?action=recent).
The majority of the posts encountered were just bounty reports by the bounty hunters, nothing constructive.
Is there a way to exclude some boards or choose the boards from where to view the recent posts? There may be a URL addition that I might be not aware.
18  Other / Off-topic / Re: Ghosts. True or false. on: October 16, 2019, 03:33:26 PM
I've read, that supernatural is whatever science can't explain (yet).
If you believe, there is a spiritual life, or life after death then ghosts could exist.
If you believe that we have just this life and nothing more, then ghost have no place on this world.

19  Other / Ivory Tower / Re: Google claims breakthrough in Quantum computing on: October 15, 2019, 01:11:14 PM
Don't worry about.
If they have a working quantum computer they would keep it secret in order to use in case of war.
There are more important uses than using it for breaking BTC.
Do you remember what happened with enigma?
Alan Turing and his team constructed a machine that broke the codes made by enigma.
None new about it, this construction was revealed more then 30 years later in the '70s.

Bitcoin in danger?

Quote
This week, news has emerged that Google has made a recent quantum computing breakthrough, achieving quantum supremacy. It is being reported that Google, using a quantum computer, managed to perform a calculation in just over three minutes that would take the world's most powerful supercomputer 10,000 years.
...

According to Gizmodo, it has been long known that Google has been testing a 72-qubit device called Bristlecone with which it hoped to achieve quantum supremacy and the initial report from the Financial Times says that the supremacy experiment was instead performed with a 53-qubit processor codenamed Sycamore.

...

"Blockchains won't be ready for such a breakthrough. Since transaction history is the backbone of blockchains, such an improvement in quantum computing could be catastrophic for the whole transaction history," added the CTO. "There is an extra layer of protection with Bitcoin's double hashing but assuming a quantum computer is capable of Shor on secp256k1 it's safe to assume it's also capable of Grover256. Also, we don't know bounds for SHA regarding quantum circuits."
...


https://www.forbes.com/sites/darrynpollock/2019/09/24/googles-quantum-computing-breakthrough-brings-blockchain-resistance-into-the-spotlight-again/
20  Other / Ivory Tower / Re: Where greed comes from? on: October 14, 2019, 01:48:06 PM
What you are describing was in the very early days, when the human existed as an ape.
Very soon someone realized that he could control others and make them work for him.
Τhis kind of control over people led to power and then to greed.
However it is not common in some indigenous people (i.e South America), so greed has to do with the environment too.
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