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News: Latest Bitcoin Core release: 27.0 [Torrent]
 
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1641  Bitcoin / Armory / Re: I send BTC to offline wallet on: June 07, 2020, 08:52:13 AM
ok. Is now everything set correctly? I can't see these bitcoins now too.

Yes. Armory is connected to core.

You can't see your coins yet because your wallet is synced up to block 389815 (according to your screenshot).
However, your transaction was included in block 633007.

Once core has passed this block, you will see your coins.




do you think I lost my BTC?

If the address you sent the coins to is from armory, no. You did not lose your BTC.

With a transaction, you are transferring the ownerships of UTXO's (your BTC's) to a different public key.
And with the corresponding private key, you are able to spend them.

Just because you don't see them in your wallet yet, doesn't mean that you don't own them.
1642  Other / Beginners & Help / Re: Cycldek: Bridging the (air) gap on: June 07, 2020, 08:49:05 AM
Use instead QR codes and   optical path to hand it over and you'll be always on the safe  side

No. You are never "always on the safe side".
There are multiple ways to infiltrate an air-gapped system.
And there are even more ways to exfiltrate data from such systems. Using a flash drive is just the easiest one. Using the cable of the monitor to emit radio waves is one example. Those radio waves can be received by any mobile phone with an integrated FM receiver.
Malware does exist to do so. There are PoC's available for that. Studies are being done in this field.

You will never achieve to always be safe.
The goal is to increase the security as much as possible, not to have a completely secure setup. Because that is not possible.
1643  Other / Beginners & Help / Re: [SOLVED] Sending Bitcoin from legacy address to segwit address? on: June 07, 2020, 08:42:47 AM
This is a matter of both your client (wallet) and you. If client is capable to do that then nothing would deter it from signing and sending  (1...) => (b2..) transaction.

Segwit address do start with bc1, not b2.


As for you yourself  it is necessary 1) to ensure the   recipient is not against such trx

There is not a single reason to be "against such a tx". This doesn't make sense.
The recipient doesn't care about the type of transaction. All he cares about is that he receives his funds.


2) to evaluate whether this is advantageous in terms of fee.

It is. Always.
1644  Bitcoin / Project Development / Re: Hello I need help in accepting bitcoin on my upcoming lottery website on: June 07, 2020, 08:34:13 AM
P.S. Running a full node could be more risky, humans are humans and humans make mistakes.
You're absolutely right cause if human error is not put in check it may affect the OP fund and running the full node also require some computer skillls when implementing the script. However, the best choice for the OP is to make use of https://btcpayserver.org/ and OP still need to do his own research either.


If you can't write a simple script to do the actions you need to be done once a payment is coming in (or confirmed), you are - by far - not able to host a lottery site.
Running a full node is not risky at all.

Obviously you have to check your implementation. Setting up some triggers is not as hard as setting up the rest of the backend of a crypto lottery site.

The choice purely depends on what OP needs and wants.
1645  Other / Beginners & Help / Re: Sending Bitcoin from legacy address to segwit address? on: June 06, 2020, 02:46:22 PM
You can always send to any address type and receive from any address type.

The reason, you sometimes can not withdraw etc. is because their software has not been updated (in 3 years).
Stop using services which do not allow to withdraw to a bech32 address. They obviously do not care being up-to-date. I wouldn't trust them.

Again, the network allows you to send/receive to/from any address type.
1646  Bitcoin / Armory / Re: I send BTC to offline wallet on: June 06, 2020, 02:42:28 PM
You can not "recover" your coins in terms of undo the transaction.
The transaction is already confirmed and the funds now belong to the address you sent them to.

You don't need to be online to receive BTC and you don't need to be online to send BTC.
You just need an internet connection to broadcast a transaction.

If you want to spend/access your coins, do this:
2. Create a watch-only wallet in an online computer, make an unsigned transaction in your online computer. Sign it in your offline computer and broadcast it using your online computer.  


If not, what exactly do you want to achieve ?
1647  Bitcoin / Project Development / Re: Hello I need help in accepting bitcoin on my upcoming lottery website on: June 06, 2020, 02:37:00 PM
You basically have 2 options:
1) Use a 3rd party to handle all the payments or
2) Set up a full node and some scripts yourself

Option 1) is easier to do, but has the effect that you are not in control of the private keys and with most providers you have to pay a fee.
Option 2) takes a bit more time to set up, but you will be completely independent and have full control over your private keys. You'd need to write some scripts (e.g. to update your DB whenever you receive a transaction / confirmation).

Which option you want to choose, fully depends on how bit you want to scale your project and whether or not you care about security / privacy.



I can help you with that. Please Add me on the telegram @VikingLord and let's discuss further.

And don't accept "help" from new accounts.
1648  Other / Beginners & Help / Re: Cycldek: Bridging the (air) gap on: June 06, 2020, 11:50:31 AM
Stealing through USB drives is nothing new, it'd be different it uses audio medium (fan, speaker, etc.) or monitor which usually only happened in movie.

Or even the power supply using probes connected to the PC and the electric control box  Tongue

Malware exists for all of these types already (power supply, speaker, hard drive LED's, monitor to emit radio frequency waves, ... )



OP, if you are interested in bridging the air gap, take a look at the ANT-catalog from the NSA (leaked via wikileaks):



  Cheesy
1649  Local / Anfänger und Hilfe / Re: xpub Key anhand von Empfangs-Adresse on: June 06, 2020, 11:36:50 AM
Die Generierung/Ableitung funktioniert nur in eine Richtung:

Allgemein: Private Key -> Public Key -> Adresse
Mit master keys: Seed -> Master private key -> Master public key

Und Adressen lassen sich entweder mithilfe des xpriv oder xpub generieren:
1) Master private key -> Child private key -> Child public key -> Adresse
2) Master public key -> Child public key -> Adresse

Rückwärts ist dies nicht möglich. Das heißt du kannst von einer Adresse, nicht auf den master public key schließen. Und dementsprechend kannst du auch nicht herausfinden ob unterschiedliche adressen vom selben xpub stammen.

Wichtig: Mithilfe des master public keys und eines child private keys lässt sich bei non-hardened derivation paths der master private key errechnen. Also bei einem sicheren Setup niemals einen private Key teilen.
1650  Bitcoin / Bitcoin Discussion / Re: where are private keys stored? on: June 06, 2020, 10:51:41 AM
I am for example using etherdelta and they have an option to import an account. I insert the public key then i go to the next step to enter the private key. Then I just enter a string of letters and numbers then it says invalid key. This surely means that etherdelta knows what is the right private key associated with that public key. Otherwise it would accept whatever input.

Etherdelta - their server - does not know anything.
The local javascript applicatoin which is running inside your browser tells you that the private key does not match the public key.



Then should we say that the only one who knows my private key is my public address?

?
When you sign a transaction (as i have described in my post earlier), you are using your private key.
Everyone in the network can then verify it using the public key.

Whether you or someone else (with access to your private key) signed the transaction does not matter.
1651  Economy / Speculation / Re: Continue to Hold your bitcoin on: June 05, 2020, 04:41:27 PM
From the historical data, bitcoin prices and bitcoin supplied by miners to the exchange show a negative correlation. In other words, the less bitcoin miners transfer to the exchange, the greater the probability that the currency price will bottom out.

Correlation is not causation.
That's not an assumption you can make based on your data.

This just means there is a connection between these two events. But one does not cause the other.
1652  Bitcoin / Bitcoin Discussion / Re: where are private keys stored? on: June 05, 2020, 04:36:18 PM
Your private key is (or better: should be) only stored in your wallet on your PC / mobile / whatever device you are using.
They are not stored on the blockchain at all.

Your private key is used to sign transactions. These signatures can be verified using the corresponding public key.
No one needs access to your private key to verify signatures.



So in case of etherdelta for example, it is an online wallet, do they have my private key? When you open an account there you are given a private key.

In the case of etherdelta, they don't have your private key. The private key is generated locally in your browser.
You are not given the key from their server.



I am just wondering if the blockchain has no memory how does it know whether the secret key i entered is correct or not.

You don't ever enter your private key anywhere.
You sign a transaction using your private key. And everyone can verify it by using the public key.

For visualization:
A transaction = "I want to transact X BTC from address 1 to address 2
Then you sign the transaction using the private key of address 1.
Everyone can then verify the signature by using the public key of address 1.

Please note that this visualization is not completely technically correct. But it gives you an idea how it works.
1653  Bitcoin / Hardware wallets / Re: Vulnerability in the Ledger Bitcoin App Discovered on: June 04, 2020, 06:55:06 PM
The same vulnerability has been fixed by trezor.
This has something to do with segwit and other wallets are most likely affected too.

Trezor post: https://blog.trezor.io/latest-firmware-updates-correct-possible-segwit-transaction-vulnerability-266df0d2860
1654  Economy / Web Wallets / Re: wallet identification number is lost on: June 04, 2020, 12:42:12 PM
Thanks for the advice. If I get access back Cry, which wallet do you recommend to use?

Basically any reputable desktop- or mobile wallet.
For desktop usage, electrum is a good wallet which offers some nice features.
Note that there are quite a few phishing sites who look like the original one. Download only from https://electrum.org and preferably verify the signature.

For a mobile (android): Mycelium, samourai or electrum would be recommendable.
1655  Local / Deutsch (German) / Re: Die Default Trust wurde geändert ! on: June 04, 2020, 11:12:35 AM

Funktioniert aber nur für DT1 Member und nicht für alle Member des Forums  Smiley

(This does only work for DT1 members and not for every one Smiley)
1656  Economy / Goods / Re: Any t-shirt printing and drop shipping service that accept Bitcoin? on: June 04, 2020, 09:33:17 AM
I pm'd you.
1657  Bitcoin / Development & Technical Discussion / Re: Trx Fee on: June 04, 2020, 08:50:34 AM
How do u create these inputs?

Your wallet is doing this in the background.

All you have to do is set the amount you want to send and the receipent.
Your wallet will figure out which inputs to use.


In electrum, if you want to set the inputs yourself, you can go to the "Coins" tab -> Select multiple UTXO's and click on "Spend".
You'll see the chosen inputs when signing/broadcasting the transaction.
1658  Economy / Goods / Re: Any t-shirt printing and drop shipping service that accept Bitcoin? on: June 04, 2020, 08:41:00 AM
I might be able to set something up for you.

If you could answer the following questions, we can work something out:
  • What are the quantities you will be ordering per month ?
  • Are you going to fully dropship? No stock in your warehouse ?
  • What is your expected price per tshirt ?

Feel free to answer them in a PM if you want to.
1659  Local / Deutsch (German) / Re: Die Default Trust wurde geändert ! on: June 04, 2020, 08:18:51 AM
Das ist echt eine gute Frage. Laut der Liste von LoyceV hat er 9 Distrusts gegen 17 Trusts: http://loyce.club/trust/2020-05-30_Sat_12.05h/81995.html
Ich hatte keine Zeit, alles in Meta durchzugehen aber das muss ein Fehler von der Forumssoftware sein, rechnerisch hat er keine Chance darauf, da man ab mehr Distrusts als Trusts kein DT ist, weder 1 noch 2...

Laut meinem Tool sind es 34 trusts und 50 distrusts. Und das deckt sich auch mit dem von dir verlinkten Trust list viewer.

Auf DT1 bezogen, liefert mein tool das hier:


Code:
peloso is included by 11 DT1's:
klarki
WhiteManWhite
bobita
Vispilio
imhoneer
KTChampions
3meek
gospodin
madnessteat
Ratimov
zasad@

Code:
peloso is excluded by 20 DT1's
qwk
Vod
A-Bolt
Foxpup
ibminer
Timelord2067
mindrust
Lesbian Cow
suchmoon
examplens
tmfp
yahoo62278
LoyceV
actmyname
The Pharmacist
xtraelv
o_e_l_e_o
asche
morvillz7z
efialtis

11 inclusions; 20 exclusions.
1660  Bitcoin / Development & Technical Discussion / Re: Trx Fee on: June 04, 2020, 08:10:48 AM
how could sb include more than 1 inputs?
as I understand we could only have 1 input and 1/more outputs.
isn't that the case?

You can include as many inputs and outputs as you want.
Of course there is a limit. The current limit for the maximum size of a transaction is ~100 kB. That's way higher than your transaction should get.

Note that if you receive multiple transactions to the same address, these are all different UTXO's.
If you receive 10 x 0.1 BTC to address X and send your whole BTC from address X, your transaction will have 10 inputs.



Wow that is something I learn today. If I have a bitcoincore wallet and import it to an electrum wallet that means both addresses are in my electrum app which all their BTC are added up? 

You can not directly import your core wallet into electrum.
And AFAIK you can't import private keys into an HD electrum wallet (not absolutely sure about that).

But if you create a wallet with your private keys from electrum and from core, yes. The BTC will add and you can send the whole amount in a single transaction.

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