TLDR

descriptor-codec is a rust library for encoding and decoding Bitcoin wallet descriptors, achieving a 30-40% size reduction. This can be useful when sharing a descriptor as a QR code, over NFC, or in a data-constrained environment.

This library is partially inspired by this comment by @sjors, where he suggested that wallets may seek to reduce QR code size. It is based on the encoder I built for descriptor-encrypt, with additional support for descriptors with private keys.

...read more at delvingbitcoin.org