Up to now we were supporting two versions of the UR standard: The legacy one implemented in `bc-ur` and the current version in `ur-registry`.
@Kukks forked a separate version of bc-ur for our web-bundle ([some more details](https://github.com/CoboVault/cobo-vault-blockchain-base/pull/8)), but it got hard to maintain the custom build, because the web-bundle needed manual assembly. We decided to get rid of the support for the legacy version and bc-ur, so that we can continue with the current version, which seems to be implemented across modern wallets (if they support UR at all). This way we can continue with only the `ur-registry` as a dependency, which handles encoding and decoding.
I needed to make some modifications for the browser version of `ur-registry`. So I [forked their module to our org](https://github.com/btcpayserver/ur-registry) and I submitted the [modifications as PRs](https://github.com/KeystoneHQ/ur-registry/pulls) — hopefully we can eliminate our fork once those changes get merged. We are in contact with them and maintaining that fork wouldn't be as hard as the bc-ur one, because at least it has a working and automated build.
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