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Title: More compact encoding for bitcoin QR codes? Post by: uminatsu on April 08, 2014, 06:02:14 AM More compact encoding for bitcoin QR codes?
Most bitcoin-related QR codes encode the base58check ASCII string in byte mode. For example the QR code for address 1JwSSubhmg6iPtRjtyqhUYYH7bZg3Lfy1T actually encodes the byte sequence "314a7753537562686d6736695074526a747971685559594837625a67334c66793154". But this is rather wasteful. We could have just encoded the binary form of the address with checksum, "00c4c5d791fcb4654a1ef5e03fe0ad3d9c598f98274abb8f1a". It would allow a smaller QR code. Title: Re: More compact encoding for bitcoin QR codes? Post by: rme on April 09, 2014, 05:44:14 AM For reference, this is the smallest size of a Bitcoin address qr code:
http://chart.apis.google.com/chart?cht=qr&chs=100x100&chl=bitcoin:1R2sWeVhFitB8zVbkrmdSoXzaQRsw6cfh&chld=M|0 http://chart.apis.google.com/chart?cht=qr&chs=100x100&chl=bitcoin:1R2sWeVhFitB8zVbkrmdSoXzaQRsw6cfh&chld=M|0 Title: Re: More compact encoding for bitcoin QR codes? Post by: uminatsu on April 09, 2014, 11:20:16 PM For reference, this is the smallest size of a Bitcoin address qr code: http://chart.apis.google.com/chart?cht=qr&chs=100x100&chl=bitcoin:1R2sWeVhFitB8zVbkrmdSoXzaQRsw6cfh&chld=M|0 http://chart.apis.google.com/chart?cht=qr&chs=100x100&chl=bitcoin:1R2sWeVhFitB8zVbkrmdSoXzaQRsw6cfh&chld=M|0 Not really, you can make the QR code smaller if your Bitcoin address is made up of entirely numbers and upper-case letters. Example: https://i.imgur.com/KSKIkwx.png (Tips welcome!) It can be even smaller if the address is made up of only numbers, but it is probably not possible for anybody to find a corresponding private key: Example: https://i.imgur.com/kMRnSoT.png (Don't send coins here!) Title: Re: More compact encoding for bitcoin QR codes? Post by: rme on April 10, 2014, 11:35:32 AM I mean common ones
Title: Re: More compact encoding for bitcoin QR codes? Post by: uminatsu on April 10, 2014, 10:21:04 PM I mean common ones Correct, in general we cannot make the QR code smaller if the QR scanner expects the address (or key) in base58-encoded ASCII format. However my question was why don't we just encode the binary address (or key) in QR code? It would allow smaller QR code, or cleaner/more robust QR code given the same footprint. |
