The offline computer is supposed to be used only for signing transactions which you have to prepare earlier on the online one. Watch-only wallet does not hold your private keys (it wouldn't make any sense) and can be only used for receiving funds, monitoring your transactions and preparing unsigned ones. I don't have any experience with Armory. I have mostly used Electrum so far for cold storage.

Currently, Bitcoin Core does not allow users to relay transactions with fee lower than 1 sat/b. Fortunately, this is going to change in the next release of Bitcoin Core (0.18.0). Here you can find more information.


There should be the same inputs and outputs with no change to the amount of coins sent + a new input which will be spent on the increased fee and an extra output if there are any coins left from the new input. However, there are different variants of RBF.

It won't work. According to Google Play, Mycelium requires at least Android 4.4.


Samsung Galaxy S2 received an official update to Android 4.1. Most wallets require at least Android 4.2 or 4.4. That's why we recommended OP to install a custom ROM. He will also benefit from up-to-date security patches.

Well, that's an interesting approach. Electrum has just released a software update in which bech32 addresses are the default ones. Users are obviously allowed to select a legacy type of addresses during the wallet setup but they can't switch between these two types (nested is only supported while importing the seed) without having to change currently opened wallet file. What will you do once SegWit becomes much more widely used?

The moment you connect to the node. After that your client requests transaction data regarding your addresses which are disclosed to the node operator. @ETFbitcoin pointed out that there is no point in using Electrum with Tor unless you generate a new wallet. I have described how you should transfer your coins in this post.


Electrum is one of the best software wallets, especially if you don't want to bother with synchronizing your own node (Bitcoin Core). Samourai Wallet is great but it's available only for Android.

You don't know if the node operator is logging information about clients which connect to their node. They might know that x, y, z address was used by someone from certain IP address.


Not really. Transactions are not completely private. Everyone is able to track specific inputs and outputs using block explorers. That's why Bitcoin mixing services are so popular. You should also read more about coin control. You can easily control which coins (inputs) you are going to spend but, first, you have to understand why it is important.

In what situation would it reset? Accounts are detected automatically, even after wiping your Ledger and re-entering the same seed on a different device. Keep in mind that exposing your private key is dangerous and you should consider re-initializing your wallet again (generate a new seed).

Bill Gates is definitely going to steal our bitcoins and dump them because Bitcoin is pure evil... How about no?

I have been using Windows 10 for a long time and nothing bad happened so far. There are many guides which show how to disable telemetry but it has nothing to do with the security of your coins. If you are really paranoic then consider buying a hardware wallet or switch to other operating system which is based on Linux and is open-source.

Your IP is being exposed to the node you are currently connected to. What other information does it know? Your public addresses since you request information about transactions associated with them. Using Tor allows you to avoid linking your Bitcoin address to your IP address. Not every node operator will collect information about you of course. You shouldn't worry about it if your Bitcoin address is already somehow associated with you.

This might be why Electrum doesn't work on your machine. You can download this update either from the Windows Update or directly from the official Microsoft website.

Edit: It looks like @BrewMaster mentioned exactly the same issue.

As far as I know, you can upgrade Android on your phone to version 4.1. Most wallets require at least Android 4.2. According to Google Play, Coinomi Wallet should work for you. You could also try Samourai Wallet but I have no idea whether it's going to work for you. Why would you use such an old device? I am quite sure there are many exploits from which you can suffer.

Edit: It looks like Samourai Wallet requires Android 5.0. You can also consider installing a custom ROM for your device. I guess that there are plenty of them available since the S2 model was quite popular.

You have to delete that block manually. You won't have to re-download previous blocks. Stop your Bitcoin Core instance and open its data directory. Go to blocks folder and delete files associated with this block (blk.dat and rev.dat). A similar problem has been described here and it was answered by achow101 who is also a member of this forum.

Actually, there is an autopilot and it might have just worked for you. According to this transaction, your address 2N5gfEWg4nMU1DS4uLRwqwCQfG8Yym3Jf7m received exactly 0.001 BTC. These coins were almost immediately split between two native SegWit addresses. This suggests that the autopilot has funded a channel for you. Use the following command to check whether or not your payment channel is active:

lncli listchannels

If there is anything listed there then you can try to pay for something over the Lightning Network because your transaction has already more than 6 confirmations.

If you executed only these three commands then you didn't open any channel. You have just funded on-chain wallet of your Lightning Network node. In order to open a channel, you have to execute the following commands:

lncli connect <PUBKEY>@<HOST>:<PORT>
lncli openchannel --node_key=<ID_PUBKEY> --local_amt=<AMOUNT>

Could you share your txid with us? Since you are working on the testnet, it won't have any impact on your privacy.

Don't you think that they implemented it because of the pressure of the community? A lot of people have been complaining that they care only about their latest model (e.g. Monero is only available on that model). The following fragment of the blog post made me jump to such a conclusion.

I have got some good news for you! Trezor One has just got another update in which support for OMNI layer has been introduced. TREZOR One is now capable of holding OMNI, MAIN and USDT (Tether). Here you can read more about the update.

I don't think that it's because of the outdated Android. According to Google Play, this wallet is not compatible with my Samsung Galaxy S8+ and S9+. There must be something wrong with the app itself. Obviously, I can't find it when I browse Google Play on my devices.

Trezor T was released not a long time ago so it's understandable but Ledger Nano S...? I have already tested the latest update with the Trezor model T and there are still a few bugs. Passphrases are not supported properly. The wallet requests passphrase too early (even Mycelium displays such error).


What about Samourai Wallet? What features does it lack? The only one I can think of right now is no support for hardware wallets.

Keep in mind that uninstalling apps won't result in loss of coins. The number of apps you can have installed at the same time depends on how much they are similar to each other (you will be able to keep more apps if they are forks of Bitcoin).

Honestly, I would go with Trezor. I had Ledger for about 8 months and I quickly got tired of wallet issues (sometimes transactions wouldn't load). They might have already fixed that since Ledger Live is already available, but as far as I know, Ledger still doesn't allow their users to use external nodes so if their nodes malfunction then their app becomes useless.

There are actually quite a lot of block explorers which support bech32 addresses. Blockbook, OXT, smartbit, blockchair, BlockCypher and more. They are not as popular as blockchain.com, but as you can see, there are many alternatives.