https://bitnodes.io does not show all bitcoin full nodes, but rather nodes that accept incoming connections from port between 1024 and 65535, and Litecoin has a similar analysis


https://ltc.bitaps.com
or
https://blockchair.com/en/litecoin/nodes

• For dogecoin node https://blockchair.com/en/dogecoin/nodes
• For monero node  https://monerohash.com/nodes-distribution.html

As for unknown altcoin or general answer you can check Port Forwarding using canyouseeme.org just open port 18080 or 18081

I do not advise you to extract the private key, a.k.a master private key, as wallet.dat allows you to encrypt your private key with a password, and the stronger and unique it is, the more difficult to hack your wallet.

bitcoincore wallet is not a good option for beginners so why not use any SPV wallet like https://electrum.org or https://sparrowwallet.com where you get your 12 words wallet seed which can be easily stored offline.

THERE'S NO SMOKE WITHOUT FIRE, and when eyes started on FTX, it collapsed quickly, so there is no need to risk your coins and trust that everything will be fine.
Kucoin will not be safe if you use it in the United States and will likely be banned in more countries.

A soundproof room will be sufficient as a noise level of 50-55 dB can be tolerated.
These solutions remain useful for those who own one or two mining devices, but for mining farms or whenever the number of miners exceeds two, it will be completely different.

My answer was to this part, he assumed that if the wallet seed was hacked, the passphrase would make his wallet safe, so he was not careful about its security and kept it in a gmail account, and we all know how easy it is to hack these accounts.
So I explained to him in terms of entropy how relying on passphrase is not safe.

You cannot mine cryptocurrencies using RAM (Random-access memory) because you need some computing power, so cryptocurrencies are mined using the Central Processing Unit (CPU), Graphics Processing Unit (GPU), or ASICs.
the good ones crypto cannot be mined using only your home computer, but you need to make some improvements to the hardware, then you can mine Monero, Zcash, Grin and a few crypto and to mine Bitcoin you need ASICs.

I created a similar topic a year ago when Türkiye earthquake happened. Is Metal Seed Storage Safe in an Earthquake?
Metal Seed Storage with a passphrase stored in a separate place is good for fires, floods, and natural disasters, but if the disaster is like an earthquake or something that could make it impossible to recover, I think it is better to use a multi-signature wallet where you can distribute the signatures to several countries. The distribution of keys for these wallets varies according to your capabilities.

By storing the seed in Google, we cannot assume that this wallet is cold storage.

Your friend reduced the entropy from 128 bit key strength, which is considered safe, to about 10 non-random characters, which a person can remember.

Let us take the entropy of such a passphrase
we've got

26 small chars + 25 big chars +10 digits+3 special chars= 64 possibilities.

(64^10)/2 = 5.76460752* 10¹⁷ (entropy would be greatly reduced if social attack was used and the word was easy to guess.)
While electrum entropy
(2^128)/2 = 1.70141183 * 10³⁸


In short, Seed Extension word that can be remembered will not be secure enough if the hacker gains access to the wallet seed.

// I modified the wording to avoid misunderstanding the phrase.

This is another reason not to use the browser to remember sensitive data, it is better to encrypt passwords in a file or use an open source password manager.


I think the report means Ledger and Trezor Extension, and since a fake version of the web browser was downloaded, all the extensions in it will inevitably be unsafe.

I would prefer to choose Ubuntu or any open source OS, but if you do the first step successfully, then 2,3,4 steps are correct.in Electrum import the private key with this command: p2pkh:<<private key1>>

Google Play からデータをダウンロードするリンクがありますが、得られるのはランダムな APK ファイルのダウンロードです。
Moblet.jp というドメインは数か月前に作成されましたが、韓国のソーシャル メディアでは存在感がなかったのに、どのようにして韓国で 150,000 のオンライン/オフライン販売者を獲得できたのでしょうか

Do not do this, it is better to move your coins to a new address and then import the private key (not wallet seed) of the address that contains forked bitcoin.
Electron Cash is developed by an unknown developer and the code has not been reviewed sufficiently, so it is best to avoid installing it on a device that contains your Electrum wallet files.

You can also create a DIY Trezor Crypto Hardware Wallet and modify the outer case to be different from the shape of Hardware wallets, but in the end, I think that an airport security employee may ask you what this device is, so always add a secure element when make your own HW.

https://www.youtube.com/watch?v=mZmv4wG6_PE (Trezor code updates faster than most DIY solutions)

Advantages of DIY HW:
Possibility of adding a safe element.
Support for alternative currencies.

Other than that, I think burning an open source OS on USB and running airgapped on it would be easier, especially since you can get a PC at a cheap price and learn to remove network parts from it.

Is 33 dB to 40 dB the result of the experiment or what they promise you? Reducing the noise from 75 to 33 would be great, but the best I got was ~(50-55) dB.

Connecting to public servers is usually bad for privacy. It is true that Tor proxy enabled means that your real IP address is not shown, but they can still see your addresses. Connecting to more of these servers means that more servers may collect more data about your addresses, which It can be used to reveal your real IP address if you look it up using some block explorers.

So be careful or make all your connections through Tor.

By design, the wallet believes that payment addresses are actual change, but they are not fixed so that each transaction does not appear multiple times.

You can solve this problem by deleting this line https://github.com/bitcoin/bitcoin/blob/d0f81a96d9c158a9226dc946bdd61d48c4d42959/src/wallet/wallet.cpp#L1756


and recompile

You can see discussions on this topic here https://github.com/bitcoin/bitcoin/issues/16160

You can do this in two ways:

1)

• Offline machine: Writing a simple script that searches for the public key (Bitcoin addresses) and extracts it to a file.
• Online version: check the addresses that contain a balance and then return again to offline machine to extract the private keys for addresses with balance only.

2) dump wallet using pywallet.py https://github.com/jackjack-jj/pywallet using the command


dealing with json format is easier than txt file.

This noise box is good at reducing noise levels, but it will not make the device silent so that it works in quiet areas such as residential apartments, but rather for open areas.

They claim that it reduces the sound to about 30 dB, which is closer to the sound of a library, but from my experience, I believe that the sound is around 60 dB to 65 dB, which is closer to the sound of a vacuum cleaner when it makes a noise or the sound of the TV turning on loudly. If you are in a crowded residential environment,Your neighbors will definitely not be happy with these sounds all day.
But if you have a separate and isolated room, you may be able to lower it to less than 55 dB, which is similar to Low Volume of a TV.

Great job. I didn't think it was that simple, especially since the edges of soda can appear to be very serrated and it may have caused some injuries.
The encoding process is difficult, but decoding seems much easier.

You did not do it correctly and it is better not to use that wallet seed because about 10 words appear clearly.
The last 8 words appear clearly, there are two words at the top that are easy to guess, and the last two words can be easily guessed by brute force, especially since their order is specified.

The process of mining Bitcoin by burning Flared Gas is not simply that there is an energy source and you insert the plug of the mining device into that source, as the gas is not burned if there is the possibility of storing it and selling it to the markets.

Burning the gas can either be a temporary process, as happens in flowback, where it is burned as a temporary measure to remove hydrostatic pressure, which is a stage before the well starts producing gas or as a temporary measure when problems occur.

Bitcoin mining resulting from this process is not a continuous thing, and therefore there will not be separate units in mining companies to exploit it, but rather a temporary thing.

If someone has more experience or knowledge, please add more links. Moving the topic to the mining board will give you better replies.