Explains how to give yourself a Mastodon handle on a personal domain without running or hosting a Mastodon server by implementing WebFinger on that domain. Discovery in ActivityPub-based networks relies on WebFinger queries to /.well-known/webfinger?resource=acct:user@server. The procedure is to request the WebFinger JSON for your existing Mastodon account (which lists subject, aliases, a profile-page link and an ActivityPub "self" actor URL), save that JSON, and serve it from https://yourdomain/.well-known/webfinger. Once served, searching for @user@yourdomain resolves to your real account on the external instance, so the domain acts as a persistent, discoverable address that can forward people to whichever instance you use.
Notes cover practical limitations and variations: this simple copy-serve approach behaves like a catch-all unless you add logic to selectively respond, and it differs from a split-domain self-hosted setup (LOCAL_DOMAIN vs WEB_DOMAIN) that requires redirects and CORS between domain and instance. Community tips include using proxies (Cloudflare) or static-site hacks (Jekyll) to host the WebFinger file, and using tools like Twitodon, Fedifinder or Debirdify to map Twitter accounts to Mastodon. Also observed: some instances only return the custom-alias result when the searcher is logged into that instance.
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