On Mon, Jun 05, 2017 at 02:21:34PM -0700, Axel wrote: > > > On Monday, June 5, 2017 at 10:52:25 PM UTC+2, Chris Laprise wrote: > > > > Can OpenTimestamps be easily reconfigured to use a blockchain system > > other than Bitcoin? > > > > Chris > > > > From OpenTimestamps.org: "OpenTimestamps aims to be a standard format for > blockchain timestamping. The format is flexible enough to be vendor and > blockchain independent"
Yup, OpenTimestamps proofs can contain attestations from multiple different notaries simultaneously. Multiple attestations is also backwards compatible, in that a Bitcoin-only verifier will simply ignore attestations using other mechanisms that it doesn't know about. Currently the only code that's been written in addition to Bitcoin is preliminary Ethereum support, however that was only added at the insistence of a banking client; I personally don't think it's particularly valuable to have. Ethereum doesn't provide a very different guarantee than Bitcoin does, and in practice it's suffered a lot of consensus issues; what exactly Ethereum is isn't well-defined. The Ethereum chain also in practice timestamps the Bitcoin chain anyway, as there's a few Ethereum contracts that follow the Bitcoin chain for various reasons, and timestamp proofs can be extracted if needed from those contracts. More interesting will be when we add support to OpenTimestamps for notaries with very different trust models, namely trusted timestamping schemes like Roughtime. Such schemes will add both diversity, and can add much higher precision timestamps that a decentralized system never could. > IIUC, Stampery is a free of charge service that produces OTS proofs tied to > both Bitcoin and Ethereum concurrently. See > https://api.stampery.com/#stampery-api-usage-downloading-ots-receipts I'm not sure whether or not Stampery's OTS proofs actually include the Ethereum attestations. In any case, there's a system of 100% free calendar servers, currently operated by myself and another OpenTimestamps team member, that also allow you to produce OTS proofs. In addition, this system allows you to produce OTS proofs *instantly*, without waiting for confirmation in the Bitcoin blockchain. These calendars run on open-source software, and all data associated with them is freely available for anyone to download and mirror. I'd strongly suggest OTS users use those calendars. -- https://petertodd.org 'peter'[:-1]@petertodd.org -- You received this message because you are subscribed to the Google Groups "qubes-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-devel+unsubscr...@googlegroups.com. To post to this group, send email to qubes-devel@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-devel/20170607155005.GE13144%40fedora-23-dvm. For more options, visit https://groups.google.com/d/optout.
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