The specification has been worked on for at least a year [going by the git repo](https://github.com/eu-digital-identity-wallet/av-doc-technical-specification/commit/3d27dc8bac5a542c52bbc7fd7d3f84eea1b82795). The [(android) app](https://github.com/eu-digital-identity-wallet/av-app-android-wallet-ui) is a fork of the [EUID Wallet app](https://github.com/eu-digital-identity-wallet/eudi-app-android-wallet-ui) I think which is at least three years old