bitcoin core – Sweeping a paper wallet

I have a bunch of coin in BTC and BCH cold storage (paper wallets). And for the life of me, I cannot figure out how to sweep them out of there.

What is crazy is that DOGE has a spiffy site out there that makes this sort of thing super easy. As long as you have the private key, you can sweep the entire wallet to another wallet. Easy, secure, and reliable. It really makes me wonder how that joke coin meant to mock the entire crypto universe is the one that is best managed and easiest to use.

But I digress… This is about my holdings in these two paper wallets. The best attempt I’ve had so far was to download the app to my phone. There in the settings it allows you to sweep a wallet.

In both cases, I put in the private key, and it shows me how much is in the wallet. So it was able to unlock it. But when I “slide to sweep”, I get a simple toast message “Sweep Failed”. And nothing else. No help. No other information. No indication as to what the problem is. And doing a Google search on this has yielded exactly zero help.

So if anyone has any ideas, like something better, I’m all ears (eyes).

recover private key – is there a way to find the wallet that my address goes to ?//

I two years ago had a cash out from a casino and i went to myapp store and downloaded what I was coinbase wallet which it was the cold storage wallet that really has no ties beside a wallet connect to coinbase I later figured out. I was brand new to btc and knew nothing about 12 words that i was to immediately write down. I did make an account at is what I thought was it. I later on saw the money come into my wallet from the casino and at that point it shut my phone down and erased eveything.. when I came back online I found out that I no longer had an account at wallet under the credentials I thought were right

I guess what I am asking is there any other way to figure out where the wallet is cause it still has the money in it and is there any program I can use that may help me figure out where it is and if my private key is in cloud storage?

I have tried to recreate the same scenarfio and have never been ABLE TO understand this

BlockChain.Com Wallet – Why transaction FEE Is very HIGH

I have two wallets in BlockChain.Com web site.
When i want to transfer bitcoin from one of them situation is like this :

Money for transfer : $1000
Transaction Fee = Priority = $26

In another wallet situation is like this :

Money for transfer : $1000
Transaction Fee = Priority = $210

I am so confused!!!!!!!!!!!!!
Why does BlockChain.Com act like this?
How can i reduce second wallet’s fee?

dogecoin – Why is more debited from my wallet than just the transaction fee and the value of my order?

This is not quite a bitcoin specific question but more a general question, I think.
I tried transferring 1 doge. I know there was 1 doge of transfer fee. Yet I suddenly see this “11,37” doge appearing in my transaction at the bottom:

enter image description here

Why is there suddenly 11,37 being debited from my wallet? Are these 11,37 doge lost?

Is it ok and safe to import master public key from electrum wallet into bluewallet to be a watch-only wallet?

I want to use my iPhone (Blue wallet) to be the watch-only wallet for my offline wallet generated on electrum. So that I can generate unsigned transaction on the bluewallet and send it back to my offline wallet to be signed on electrum. And then send the signed transaction back to bluewallet to be broadcasted.

Is it safe to do so? Is there any better way to do it so I don’t have to send the unsigned and signed transaction back and forth?

Recovery Words from ~2013 Wallet Contains 4 Invalid Words

I came across my wallet from 2013 on an old external hard drive along with info like the 12 recovery words, address, etc.

I’ve tried recovering/importing it to a bunch of different wallets, but all of them are marking 4 of the 12 words as invalid and I’m confused as to how they would’ve become invalid between then and now, and how I can recover the funds in that situation.

I’m unsure what wallet/service I used to create it at the time.

Does anyone have any idea what might have happened here or how I might be able to recover this?

I have lost my wallet, what can I do?

I had an account on a website, but don’t remember which one

Search your email account for an account creation confirmation email. Helpful search terms may include “bitcoin”, “wallet”, “exchange”, “btc”, “blockchain”, or “cryptocurrency”. If you purchased bitcoins, you may want to look at your old bank statements as well. There is no global register of bitcoin users or services, so if you cannot find anything you may be out of luck—we cannot help you, because we don’t know either.

I had a web wallet, but the service shut down since

If the service had custody of your bitcoin balance, it is likely lost. Research the name of the service to determine what happened to the service, in case it just rebranded and is still around.

My wallet service still exists, but I lost access

We don’t have insight into your customer relationship with services, so we cannot help you. Contact the service and initiate an account recovery process.

I had a self-custodial wallet, have lost the wallet, and have no backup

Bitcoin balances are tracked via the blockchain, and a user’s bitcoin wallet primary purpose is to secure the private keys which are used to establish ownership and to track any transactions related to those keys. The key space is enormous. If you have lost your wallet, the same keys will likely never be regenerated and no one will ever be able to spend the associated funds.

I had a self-custodial wallet, and still have the device that it was installed on

Looking over this selection of wallets may help you remember which one you used. If you still have the wallet files, you may be able to recover your funds. The name of the relevant files depends on the software that you used, but one of the most common file names is wallet.dat. If you find a wallet file, create a backup first before trying to recover the wallet.

I have a 12 or 24 word backup, what do I do?

This is called a mnemonic seed phrase. It is a standardized way to backup a wallet’s private keys. Keep the words confidential, do not enter the words in a website or untrustworthy software. You should be able to recover your wallet from the phrase. You can find instructions how to recover the wallet from it on this site.

Is it possible that malicious bitcoin wallet providers provide pre-generated private-keys for users?

We trust wallets like Ledger, Trezor, and etc. We believe the math that the randomly generated private keys are safe. But could it be possible that the private keys you thought are “generated” are actually provided and already stored in the database?

Imagine I am the cold wallet company, and I pre-generated like one trillion private keys secretly and saved them in my own database. For each wallet chip, I carefully choose 100 private keys and write them into the chip, and mark the keys in my database as used. When a user received the wallet and tries to generate a private key, the program in the chip just picks one of the 100 keys I wrote in. No one knows whether the keys are really generated or given by the wallet provider.

When I’ve already sold enough wallets, I can iterate all the used private keys and steal all my customs bitcoins.

That sounds practical and horrible. I am using a wallet but I cannot convince myself that my private key really belongs to me. Is that scenario possible? Is there any way to guarantee that the private key is not saved by others when the wallet is not open source?

Thank you.