Hi SN!
Over the weekend, I built descriptorqr.org, a simple website for creating compact QR codes for any wallet descriptor, which are 30-40% smaller than using a run-of-the-mill QR code generator.
Behind the scenes, it uses the descriptor-codec rust library, which encodes descriptors using 30-40% fewer bytes. I discussed this library on the most recent episode of Optech.
The benefits are most apparent for large descriptors, which would otherwise be difficult or impossible to print out as a single QR code. As an example, below is a descriptor I generated with Liana that uses multiple keys with decaying thresholds:
wsh(or_i(and_v(v:pkh([f94f84b8/48'/0'/0'/2']xpub6F9mVs3MdXe2rv82DShVg6XXmHKi2X27bURPEEVzPhPA65UKHS2ifaTKmGdQuCZYcVSqyjvJEnETVUnKwu3RVtMgsAdzkJrdP8sGEyAnB6V/<0;1>/*),older(52596)),or_d(multi(2,[2c49202a/45'/0'/0'/0]xpub6EigxozzGaNVWUwEFnbyX6oHPdpWTKgJgbfpRbAcdiGpGMrdpPinCoHBXehu35sqJHpgLDTxigAnFQG3opKjXQoSmGMrMNHz81ALZSBRCWw/<0;1>/*,[55b43a50/45'/0'/0'/0]xpub6EAtA5XJ6pwFQ7L32iAJMgiWQEcrwU75NNWQ6H6eavwznDFeGFzTbSFdDKNdbG2HQdZvzrXuCyEYSSJ4cGsmfoPkKUKQ6haNKMRqG4pD4xi/<0;1>/*,[35931b5e/0/0/0/0]xpub6EDykLBC5EfaDNC7Mpg2H8veCaJHDgxH2JQvRtxJrbyeAhXWV2jJzB9XL4jMiFN5TzQefYi4V4nDiH4bxhkrweQ3Smxc8uP4ux9HrMGV81P/<0;1>/*),and_v(v:and_v(v:pkh([c32f12b7/48'/0'/0'/2']xpub6CUGRUonZSQ4TWtTMmzXdrXDtypWKiKrhko4egpiMZbpiaQL2jkwSB1icqYh2cfDfVxdx4df189oLKnC5fSwqPfgyP3hooxujYzAu3fDVmz/<2;3>/*),pkh([3abf21c8/45'/0'/0'/0]xpub6DvXYo8BwnRACos42ME7tNL48JQhLMQ33ENfniLM9KZmeZGbBhyh1Jkfo3hUKmmjW92o3r7BprTPPdrTr4QLQR7aRnSBfz1UFMceW5ibhTc/<2;3>/*)),older(26353)))))#zyvj7rq6
Without DescriptorQR:
With DescriptorQR:
The tool is free to use and transmits no data outside your browser. It can also be built and run locally, for maximum privacy.
Feel free to give it a try! I'd welcome any feedback, both on the tool and on descriptor-codec.
Website: https://descriptorqr.org
Screenshot:
descriptor-codec.