This repo contains .apk files built from the latest version of otc-auth.
apk add curl
curl -SsL -o /etc/apk/keys/otc-auth.rsa.pub https://iits-consulting.github.io/apk-repo/otc-auth.rsa.pub
apk add otc-auth --repository='https://iits-consulting.github.io/apk-repo'