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Steve: Just saw this post. Nice meeting with you.
I'm a little out of place in the development area; please excuse.
The issues I see with exposing private keys are:
a) the client may assign change to that address at any time if in wallet.dat
b) a new bitcoin user may expose his private key for his public payment address, which he receives a stream of payments.
If all semi-private keys meant to be 'published/printed' started with a certain prefix (i.e '1BTC' or '2'), the client would never send change to those addresses. When a new user creates a new address, he could select 'for deposit only' if it were his billing address.
In general, I see value in exchanging private keys in print for payment.
edit: easier to get funds out of 'savings' addresses that only exist on paper/your head.
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Just used your service for the first time last night. Very slick! Coincidence?  |
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you show me a qr code with a private key on it which has 2.0 btc on it, with change address. When scanned, a website asks how much to send. Punch in 1.23 to your address, and 0.77 goes to change address. Note is now garbage. Website doesn't hold any coins (but must be trustworthy enough to facilitate the transaction)
Or, send coins to BTCWebsite.com. BTCWebsite.com prints out notes for you, with QR codes for whoever scans them. You lose them, they are gone, same as cash. Have to trust the website, as they now hold coins. Maybe if notes are not spent by 4:00am they are returned to your personal wallet.
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Just received a few coins, and they do look great.
For those that might be a little timid about paying 1.2 for 1.0 coins, remember that you may be able to get that premium back if exchanging in person. i.e. I'll send 6 coins to your wallet to mow my lawn, or 5 physical coins.
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In a free market, Zhoutong is not the king of Bitcoin, but he IS the king of Bitcoinica.
He can ban, or allow, anyone to use the site for whatever reason he pleases.
Just as the rest of us can decide to use, or not use, Bitcoinica for whatever reason we please.
This is the only moral and fair system of property rights.
Indeed! I can't believe all those people who were crying about mybitcoin.com when Tom Williams, the Grand Nagus of mybitcoin.com, wasn't obligated to give anyone anything. He could have banned you all from his site for whatever reason he pleases. What, your BTC is still there but you can't log in? Not his problem, he got his! No one forced people to use mybitcoin.com anyway, and it turns out his site shut down anyway. The free market works! This is the only moral and fair system of property rights. Do you really fail to see the difference between A) setting rules on one's own site and B) stealing peoples' money? Theft is never permissible and is the opposite of a free market. When someone sends coins to Mybitcoin, they are now Mybitcoin's coins, and sender receives an IOU for same amount of coins in return. It is easy to say "I have 100 coins" when that person means "I have an IOU for 100 coins". If it was blatant, then it is fraud and not theft. We should all be careful when sending coins, if they dont have a reason to honor the IOUs, or don't protect their coins well enough, we shouldn't send in the first place. |
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They could open their books to an auditor and allow the auditor to render an opinion without disclosing any confidential data. This is how the rest of the world does it.
To finish the thought if not clear: If MtGox goes belly up, the auditor can then be sued for damages, and put up a bond. Of course, the auditor is going to require a fee to do this. Pick your poison: do you want to pay higher fees for a little more security, or place a discount on MtGox funds that you lay claim to. |
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OP I think you need a bigger banner in your sig.
Does anyone know flaxceed's e-mail address? |
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pywallet lets me import a key beginning with 'y', but returns a different Privkey C:\Python27>pywallet.py --info --importprivkey yP536D6V88rqcJ3qFfBYuJ6pqdg6z2SZn
m2SKDU4vRoCE9L89
'ecdsa' package is not installed, pywallet won't be able to sign/verify messages
Address (Bitcoin): 1NAjZjF81YGfiJ3rTKc7jf1nmZ26KN7Gkn
Privkey (Bitcoin): 5HpJ4bpHFEMWYwCidjtZHwM2rsMh4PRfmZKV8Y21i7msiUkQKUW
Hexprivkey: 0004d30da67214fa65a41a6493576944c7ea86713b14db437446c7a8df8e13da
I'm interested in what is going on here. EDIT: The hex seems to always start off 000 with the y addresses |
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I don't get it... For it to be 'used' it must be partially destroyed. And I would always check the balance of the address before accepting. I had a similar thought: Sign each coin address with seccure: http://point-at-infinity.org/seccure/. While this won't eliminate much, it would at least say the address was created by the manufacturer, and cuts down on number of culprits. |
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Am I doing this right? according to bitaddress.org, the address is:12DM8vG8pytcE8Q9CBj2LQnctiRRdoZ5aZ with private key of: 5Je7CkWTzgdo1RpwjYhwnVKxQXt8EPRq17WZFtWcq5umQdsDtTP However, pywallet doesn't agree: C:\Python27>pywallet.py --info --importprivkey=5Je7CkWTzgdo1RpwjYhwnVKxQXt8EPRq1
7WZFtWcq5umQdsDtTP
'ecdsa' package is not installed, pywallet won't be able to sign/verify messages
Address (Bitcoin): 1M6dsMZUjFxjdwsyVk8nJytWcfr9tfUa9E
Privkey (Bitcoin): 5Je7CkWTzgdo1RpwjYhwnVKxQXt8EPRq17WZFtWcq5umQdsDtTP
Hexprivkey: 6c9565b3eef4ef9e01c216e1910763a5f94cf3654c059e8c67a348d10ae39c28
edit: seems to work for further addresses. I printed the one above out, so I'm not crazy, looking at it now. |
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Stupid, serious question: Is it too high tech? Why not just print up a QR code included on person's bill? He can leave cash or pay with bitcoins or any mix of that. This way, you only need the customer to have internet. Waitress can check the terminal in back to verify payment came through. Or print up 100 qrcodes before and hand them to customer. Waitress would write total due on the sheet of paper.
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If I'm using BitCoin as an investment (purchasing BTC with USD on an exchange), and I bought 5,000 BTC at $10 each ($50,000 investment), and now the price has tanked to $5 each BTC, and I cash them out, I've effectively lost half of my investment. Are those losses that I can use to reduce the amount of Income Tax i'd need to pay?
To offset capital gains up to your loss. Otherwise, you can take off $3k/year. So, if you've been holding onto Apple stock for the last decade, sell $25k in profit to offset the bitcoin loss. Someone please verify. |
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Third guess: Someone's long a massive amount at bitcoinica and needs a rumor bounce.
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first guess: Doubt it 2nd guess:  |
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Tried signing up 4-5 hours ago, but never got the confirm e-mail. Clicked 'forgot password', still no email. Don't see anything in my spam folder.
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Google for "How to share a secret", a paper by Shamir. Might answer your question.
That is super cool. Create a private key and give a share to your lawyer, college roomate, aunt Mary, neighbor, co-worker, etc. These people would never be able to come together without you being aware. However, upon your untimely death they could seek each other out, and if you have the threshold amount of shares, they can decrypt your coins. |
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BitcoinIron.com
BitcoinSteel.com
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What does not kill bitcoin will make it stronger.
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I intend to come up with random, save it on paper and store it where one would store jewelry/gold. What's cool is that I can now store my 'gold' in my safety deposit box at the bank, in my wallet, engraved on my toothbrush, or on a postcard sent to my grandma. Double edged sword indeed, my 'gold' can now be stolen in many different places too.
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