diff --git a/src/config.ts b/src/config.ts
index 502544d8..1dd688b7 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -63,6 +63,14 @@ class Conf {
   static get localDomain(): string {
     return Deno.env.get('LOCAL_DOMAIN') || `http://localhost:${Conf.port}`;
   }
+  /** Link to an external nostr viewer. */
+  static get externalDomain(): string {
+    return Deno.env.get('NOSTR_EXTERNAL') || 'https://njump.me';
+  }
+  /** Get a link to a nip19-encoded entity in the configured external viewer. */
+  static external(path: string) {
+    return new URL(path, Conf.externalDomain).toString();
+  }
   /**
    * Heroku-style database URL. This is used in production to connect to the
    * database.
diff --git a/src/entities/MastodonAccount.ts b/src/entities/MastodonAccount.ts
index 27cad244..a7fef5de 100644
--- a/src/entities/MastodonAccount.ts
+++ b/src/entities/MastodonAccount.ts
@@ -40,6 +40,7 @@ export interface MastodonAccount {
   username: string;
   ditto: {
     accepts_zaps: boolean;
+    external_url: string;
   };
   pleroma: {
     deactivated: boolean;
diff --git a/src/entities/MastodonStatus.ts b/src/entities/MastodonStatus.ts
index 1fcbcacb..20c52438 100644
--- a/src/entities/MastodonStatus.ts
+++ b/src/entities/MastodonStatus.ts
@@ -39,4 +39,7 @@ export interface MastodonStatus {
     expires_at?: string;
     quotes_count: number;
   };
+  ditto: {
+    external_url: string;
+  };
 }
diff --git a/src/views/mastodon/accounts.ts b/src/views/mastodon/accounts.ts
index f9ed1cdc..5abb1aca 100644
--- a/src/views/mastodon/accounts.ts
+++ b/src/views/mastodon/accounts.ts
@@ -82,6 +82,7 @@ async function renderAccount(
     username: parsed05?.nickname || npub.substring(0, 8),
     ditto: {
       accepts_zaps: Boolean(getLnurl({ lud06, lud16 })),
+      external_url: Conf.external(npub),
     },
     pleroma: {
       deactivated: names.has('disabled'),
diff --git a/src/views/mastodon/statuses.ts b/src/views/mastodon/statuses.ts
index d440b65c..2fa8f313 100644
--- a/src/views/mastodon/statuses.ts
+++ b/src/views/mastodon/statuses.ts
@@ -124,6 +124,9 @@ async function renderStatus(event: DittoEvent, opts: RenderStatusOpts): Promise<
     uri: Conf.local(`/${note}`),
     url: Conf.local(`/${note}`),
     zapped: Boolean(zapEvent),
+    ditto: {
+      external_url: Conf.external(note),
+    },
     pleroma: {
       emoji_reactions: reactions,
       expires_at: !isNaN(expiresAt.getTime()) ? expiresAt.toISOString() : undefined,