nl-covid19-coronacheck-app-coordination

Note that this encoding isn't of the same efficiency as QR binary mode, as it converts 3 bytes into 2 base45 characters. So it's more like 'base41 using the base45' charset. I'm still a bit sad that with this standard and the packages available now, the namespace of 'base45' is clobbered with this suboptimal implementation. It can best just be renamed to 'base41'. It's a good tradeoff for the DCC, but not for the rest of possible implementations. For the Dutch variant of the green pass using unlinkable signatures [1], we need all the space we can get, so we use a base45 encoding that uses the exact same method as base58 [2][3], and which has the exact same efficiency as QR binary mode. [1] https://github.com/minvws/nl-covid19-coronacheck-app-coordin... [2] https://gist.github.com/confiks/8fcb480d87a50cf1bb5e40e2f093... [3] https://github

With CoronaCheck (https://coronacheck.nl) we have implemented one of the most privacy preserving EU Green Systems for use within our country. We use IDEMIX, a form of Verifiable Credentials. The nice feature of IDEMIX is that - unlike W3C VC - it also has the property of being able to create unlinkable credentials. Guess what? That's the reason that we've used them :) Read our technical designs here: https://github.com/minvws/nl-covid19-coronacheck-app-coordin...