Do you have a precompiled OSX build of Vanitygen?
Looking for a precompiled OSX build as well get home-brew, then use I did that but got an error message: Error: No available formula for vanitygen
Searching taps... Then I saw a post by user Red Emerald that recommended: brew tap WyseNynja/bitcoin && brew install WyseNynja/bitcoin/vanitygen That worked well on my MacBook Air with OS X 10.9.1 ! |
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The point is that it allows you (the owner of the face) to be paid without using a QR code . . . I'm not talking about a biometric private key. . . for that you'd use DNA or a retina scan, presumably.
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Also posted to Reddit: http://www.reddit.com/r/Bitcoin/comments/1uzeo6/can_your_face_serve_as_your_bitcoin_address/Given advances in facial recognition software, could you register your face with a trusted "face registrar" such that it is associated with a Bitcoin address (or sequence of addresses based on a seed) of your choosing? Then we could be paid by anyone who can take a photo of us. . . This is a special case of a more general question of whether an image (or an audio recording) of an arbitrary object can be reliably associated with a sequence of Bitcoin addresses, such that facsimiles (such as photos or re-recordings) of the same object can be submitted to the registrar to determine their Bitcoin address. This would allow payment for any visual or audio works of art without requiring the artist to reveal their identity. Comments? |
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Sure, great idea, and make sure to tattoo her QR code on her forehead before you parade her in front of the TV cameras. That'll be bank!
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What if something happens to you and the password is lost? The BIP0038 password should also be stored redundantly, and ideally, in an encrypted form. If I am not mistake, Shamir's Shared Secret algorithm is the appropriate method to store the password such that m-of-n trusted parties would need to collaborate to reconstruct the password. So to steal your bitcoin, an attacker would need to have possessed (or photographed) the BIP0038 wallet, and then would also either need to coerce you into revealing your password, or would need to find m-of-n of your trusted parties and get them to reveal their secret, so that the attacker could reconstruct the password. Use http://bitaddress.org (a saved version, offline) to generate the BIP0038 paper wallet and use http://passguardian.com (a saved version, offline) for the m-of-n Shamir's Secret Sharing. Your heirs will need instructions on how to reconstruct the BIP0038 password. |
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Here from /r/Bitcoin. Amazing idea!!
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It seems like having only the "purchasing bitcoin" option available would make it less risky to operate than having it dispense both cash and bitcoin.
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First, grab a new address. Have them grab two new addresses. Have them give you one of their new addresses, and the public key* to the other.
Use "bitcoind createmultisig 2 <yourpubkey> <theirpubkey>" to create a P2SH address that requires both keys.
Create a raw transaction to this address. Don't broadcast it yet.
(At this point, the raw transaction that you are holding irreversibly transfers coins from your control to a multisig address that requires both of you to redeem.)
Create a raw transaction that redeems this unbroadcast transaction and spends it all** to their other address. The eight zeros at the end are the lock time, in hex. Edit them. Less than 500,000,000 is interpreted as a block number, greater than or equal is interpreted as a unix timestamp. Don't forget to convert to hex.
Locktime is ignored when all inputs are already final, so you need to find the sequence numbers of the inputs. For this, you need to parse the transaction a bit, but this is easy to do by hand. They are eight Fs at the end of each input. Change at least one of them (to anything else).
Now decode your raw transaction to make sure you edited it right. Verify that "locktime" is what you want, and that at least one vin sequence number is less than 4294967295. Use signrawtransaction to add your own signature.*** Send it to them to sign. Have them return the now fully signed transaction so that you can decode it again to make sure it is complete.
(This new transaction transaction can, when the lock expires, spend the funds held by the multisig without your help.)
Now use sendrawtransaction to broadcast the first transaction, and give the locked transaction to the gift recipient.
The final state is that the gifted bitcoins are now in a transaction that you can only spend by getting them to sign a new transaction, but they now hold a transaction that you've already signed that will allow them to spend it to their own wallet.
You can also do this all yourself, and provide them with the WIF of the two keys generated for them, along with the final signed transaction. If you delete all traces of the privkeys and WIFs, you end up in the same place.
There are also variations you could do, like having them sign (or signing yourself if you are going that way) a second locked transaction that will allow you to recover the gift if not used.
* As far as I know, there is no easy way to do this step. If people are serious about doing this, I'll see about adding a getpublickey RPC command.
** Try really hard to guess how much of a fee you'll need in the future. Too low and it might never confirm. Too high and you might be giving away a lot of money.
*** You can change the order here. If you provide the redeemscript from the P2SH address created earlier, they can do the initial signing.
Wow, thanks! but that is WAY over my head. I'd better go watch the Khan Academy videos. . . |
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If one of you Bitcoin coders could implement time-locked transactions in a fool-proof, rock-solid way, I'd gift 5% of my bitcoin to friends/family, and then send 90% of my bitcoin to myself at some point in the distant future to make sure I don't do something foolish in the short-term, like selling them in the dark days of FUD ahead. I'd keep 5% in cold storage to play around with.
I'd much rather trust a time-locked script (with an easy GUI) and the blockchain as a "custodian" of my bitcoin than a bank or a law firm or a hosted wallet or even a paper wallet that requires that I physically secure it.
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I would like to gift bitcoin to friends/family without being able to rescind the gift but with them having no access to the bitcoin until it is has fully appreciated (ten years, let's say).
Can I do this with a bitcoin transaction or does it require a trusted third party to take custody of the bitcoin?
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Gandhi led his followers to make their own sea salt when the British imposed a salt tax. Satoshi led his followers to make their own sound money when the Banksters imposed Quantitative Easing, a hidden tax on money.
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Given Bitcoin's divisibility, lower-priced alt-coins would offer no compelling marginal benefit and would be far riskier (owing to 51% attack vulnerability and far less vetting by security experts). So far I have not heard of any alt-coin except for zerocoin (if it ever materializes) and namecoin (as a censor-proof DNS enabler) that I would find desireable.
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I have had good experiences with Coinbase and do not regard it as shady in any way. They have growing pains and need to hire more support staff. That is not the same as being shady.
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I think Nick Szabo (creator of bit gold, a Bitcoin precursor) is the most likely candidate, possibly with one or more collaborators.
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If I developed a successful trading algorithm, what's stopping Cryptotrader.org from copying it and using it for themselves, at my expense?
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I live in NYC. Aside from myself, I have met two persons in the real world who have purchased bitcoin.
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It would be useful for bitcoiners to purchase (perhaps via crowdsourcing) some of the prime mainstream media and fire all of the reporters who advocate militarism, totalitarianism, and banksterism.
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Because the blockchain stores all transactions, a motivated researcher could analyze the blockchain and determine which addresses appear to be associated and are likely controlled by the same entity. Then if any of the addresses can be assigned to a personal identity, all of the addresses can be so assigned.
These are probabilistic inferences, not "beyond a reasonable doubt."
If CoinJoin becomes widely used, this "network analysis" will become less useful. It can also be foiled by using coin "tumblers" or "mixers," although the use of such tools might appear suspicious to law enforcement agencies.
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As far as I know there are no forex exchanges that exchange bitcoin for fiat. Why is that? Are there laws preventing them from trading bitcoin?
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