On Mon, May 06, 2013 at 03:08:57PM -0400, Peter Todd wrote: >> Hmm: maybe one could use a Brands private credential with offline double >> spend detection, with the reputation but not coin address of the node >> disclosed, and the nodes coin address embedded in the proof. Each node >> could be is own CA, providing a ZKP. If the node ever double spends a coin, >> it loses its reputation as the coin address is revealed. > >Be careful not to mix up the concept of a relay node with someone >posessing Bitcoins. Node's don't spend coins, people/wallets do.
My comment was to say that a good behaviour bond for a relay node could be put on an address that is defined as unspendable until such time as an auditor can prove the node engaged in the undesired behaviour, at which point the audit receives the payment as part of his proof. Or until the node ceases to operate. Its a smart contract. However I added to that, that it is still possible to do that while preseving privacy, to point out that it is technically possible, for people to be aware of in their mental toolbox, if it helps solve an otherwise tricky problem. So that would be a privacy preserving smart contract, the parties are unknown, and unknowable (with unconditional security even), but still the smart contract executes. In some sense a privacy preserving smart-contract is closer to the real point of Szabo's smart-contract idea because you cant try to renege on the contract in a conventional court - because you cant identify your counter-party. Bitcoins privacy feature is fairly weak so that is probably often not true. Of course you'd probably need zerocoin to stand much chance of proving an address private key of an unlinked coin was in the double-spend disclosed attribute in the first place, and as we know zerocoin is not that efficient. > Make the node identity expensive to obtain. For instance, construct PoW's > including the node pubkey somehow, that could be easily done with the work of creating a vanity address. eg address containing many leading 0s. Adam ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development