You can take a look at https://www.bitaddress.org/. The site can be downloaded and used offline from their github at https://github.com/pointbiz/bitaddress.org. It can create paper wallets, although they may not look all that great with a vanity address since their paper wallet generator is for new addresses. You would have to use the wallet details tab and print out the qr codes.

Another option is https://bitcoinpaperwallet.com/ and you can download its source code for offline from https://github.com/cantonbecker/bitcoinpaperwallet. This one has the option of creating good looking vanity address paper wallets.

Bitcoin addresses don't expire. What expires is the payment request. There is a thing called a Payment Request, specified in BIP70. The request itself can expire, but the address cannot. That address can still receive Bitcoin and you will still be able to spend them. The expiration time does not matter unless you sent them the BIP70 payment request. In order to have sent someone that request, you would have had to save the request file and manually send it to them, so unless you did that, the expiration time does not matter.

This is a little confusing. I just tried and imported the address as watching only. List transactions did return  some transactions, but not all gave me the receiving  transactions.

This is the clearnet. Go to the service section and find someone offering escrow services. Here is a list of some escrows: https://bitcointalk.org/index.php?topic=855778.0 Choose one and pm him. Ask him if he also does multisig escrow and if he does, you can arrange the transaction.

There are many escrow services that you can pick in the marketplace on this forum. Some of them may allow multisig escrow.

This guy is probably not a scammer, he probably thinks you are the scammer, given that he wants multisig escrow.

Do you happen to have an antivirus enabled? It is known that antivirus software can be corrupt the database files by reading the files at the same time Bitcoin Core is. If you do have an antivirus, be sure to add the data directory to its exceptions list. Also check that Windows Defender (or whatever the OS antivirus is) is either disabled or also has the data directory as an exception.

Ah. I see. The problem is that your email is putting line breaks in places where it shouldn't. It probably has to do with screen width or something on the server that reads multiline text as actually having line breaks when it really doesn't. If you remove those line breaks, then it verifies.

It is used for mining. The mining algorithm is sha256d

Listtransactions does not work by address. It works by accounts. The command should instead be
Since this command has no defined account, it will list all the transactions for all the addresses in your wallet.

EDIT: Sorry, typo. Forgot the quotes.

Sure, you can send it to knightdk@mailinator.com

AFAIK there is no wallet format that is universal. The wallet formats are pretty much specific to that wallet. However, there are tools available that can allow you to extract the private keys from those wallet files to import them to another wallet.

You should send them more often. What do you mean that the signed message cannot be verified after you send it?

If you post your testnet address, make sure that it starts with an 'm' or 'n' because those are the prefixes for testnet addresses.

Yes. It is in Bitcoin Core. To start Bitcoin core in testnet mode, you will need to open up terminal. The command is
This starts in in testnet mode and you will be using the testnet network, the testnet blockchain, and a different wallet file to spend testnet coins. Everything is the same, just the blockchain is different and the prefixes are different to distinguish the testnet from the mainnet. Since the testnet is its own blockchain, you will need to download the whole thing and sync it, but the testnet blockchain is less than 5 Gb since the testnet isn't actually used that much for transactions.

No. Transactions can occur and your balance can change. Confirmations are only there to guarantee that the transaction cannot be reversed or changed. There is no such thing as a transaction "going thru", a transaction either occurs or it does it. Once it occurs, it confirms, or it does not. Both are different things.

That is why 0 confirmation transactions can be used for those small transactions. In reality, 0 conf is safe for many transactions. There is practically no risk with accepting unconfirmed transactions in most cases. Double spending an unconfirmed transaction is still incredibly hard due to the way the network works. It will reject any such double spends and that double spending transaction doesn't get relayed. The only thing to be careful about with accepting unconfirmed transactions is to check the fee that it is high enough to get confirmed and the outputs to make sure there are no dust outputs which can prevent it from being confirmed. Those two things just need to be checked and if everything is high enough, then an unconfirmed transaction can be accepted for payment with little risk of it being double spent.

Breadwallet should store that private key. You should move all of the Bitcoin stored in that address to another address. Although the address is probably safe, it is good practice to not reuse addresses. Each address should really only have 2 transactions ever, one going in, and one going out.

All of the receiving addresses and transactions are saved in the wallet.dat file. I think that the sending addresses are also stored there as well. To import them all, just put the file in the data directory. It may be replacing a wallet.dat file already there, but if that one is empty, you can delete it. Then when you start up Bitcoin Core, everything should be just as it were prior to you upgrade.

Have you been sending them weekly PMs and Emails?

Will this work on other exchanges? I have been hearing that Cryptsy is starting to go down. I have heard that they aren't allowing withdrawals and that strange things are happening.

There is a separate bitcoin network exclusively for testing. The coins are easily gotten from testnet faucets and they are worthless so that if you screw something up like you did here, nothing of value is actually lost.

Transactions do not have time stamps. There is no field in a transaction for a time stamp. They are not necessary. The timestamps you see in blockchain.info are the timestamps that their node first saw your transaction. This can be completely inaccurate.

There are a lot of ways to put data in the blockchain
Some people use OP_RETURN. Others create special addresses and the data is stored as hex.