Hello.

I'm currently working on a piece of software that needs 2-of-2 signing of Bitcoin transactions.

It's really hard, though, to find information about the workings of multi-signing. I would be grateful for any kind of pointer on:

• which Bitcoin clients provide multi-signature support
• how those clients implement multi-signature support
• which files of these clients contain the relevant code
• how an advanced user can use the multi-signature support
• how an end-user can use the multi-signature support

Ideally, I would like to find a daemon-like Bitcoin client to do the work of creating multi-signature addresses, signing the transactions and broadcasting the transactions for me. I would however also consider implementing multi-signature support into one of the existing Bitcoin clients if their code base as far as signing transactions are concerned is very clean & isolated from the other program logic and I find the necessary information about the exact workings of creating and using multi-signature transactions.

*

Hello.

I've started using Armory recently and ran into a big question, to which I hope you can give me an answer that will not make me want to shoot myself.

I did an offline transaction with Armory, which worked just fine. I created the transaction on the online client, signed it on the offline client and broadcasted it on the online client. I used an amount that was present exactly on one address, assuming that Armory would use that input, as it wouldn't require a change address.

Instead, Armory used the first address with BTC in the list, which had more BTC present than the transaction volume. A certain sum was transferred to a change address. My question now is: how do I get access to this change address?

The transaction gets broadcasted on the online client, which has a read-only copy of the wallet, so obviously, I won't be able to access the change address there. However, my offline client does not contain the change address, either.

Where is the private key for the change address? How is this supposed to work with the entire offline transaction logic?

Hello everyone.

I was just wondering how people are keeping their large amounts of bitcoins. I am currently trying to set up something very safe and would appreciate the input, so....share your setup!

Hey.

I have just googled bitfog, but I really can't seem to find any kind of comments on the service? It seems to only be reachable over the Tor network and also offers wallets.

I didn't try it yet, so I have no idea about the fees, but I would guess it's cheaper than the blockchain.info service with 1.5% fee.

I don't know how long it has been around, but I guess new services are always prone to be a scam and at the same time suffer from bad reputation/mistrust in case of legit operation.

So if anyone knows anything, let me know, I might test it.

Regards,
Me.