by: pubski

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qrguy  ·  link  ·  parent  ·  post: Pubski: May 24, 2017

Your original transaction sent 0.00859833 BTC to your new address, paid 0.00025 BTC in miner fees, and sent the remaining 0.0002924 BTC in "change" back to the original paper wallet.

Of that remaining 0.0002924 BTC, I sent 0.0002424 BTC to myself, and paid the last 0.00005 in miner fees. The paper wallet now has nothing left. I probably could have used a lower fee, if I had been willing to wait longer. The transaction backlog isn't as bad as when you tried it.

I also stole your 0.0002924 in Bitcoin Cash from the same address.

I recovered the private key by filling in the blanks in your picture. The private key was on your receipt twice -- once as a barcode and once as text. You covered up part of each, but not the same parts -- QR codes actually start laying out the data from the bottom right. So I could reconstruct that corner using the beginning of the text.

This was how far I got before my phone could scan it (with a bit of difficulty):

Even if I hadn't been able to fill that much in, the combination of you showing most of the QR code, plus its built in redundancy, means that it would likely have been feasible to brute force the remaining bits of the key.