diff --git a/CLAUDE.md b/CLAUDE.md
index ceb1bb8..a6e3820 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -607,6 +607,11 @@ tools/pasture/run.sh down                                            # removes e
   announced by the other), that alice's public post goes to the relays (and through both to Mastodon: Activity-Relay's
   forward on its FEP-8b32 proof, after the scenario makes Mastodon read alice's keys anew) and nothing less public, and
   has Mastodon leave again, so the town sees no relayed posts. 16 checks.
+- **Castopod (1.15.5, `peers/castopod.sh`):** the official image on the shared MySQL (database `castopod`, file cache,
+  `CP_DISABLE_HTTPS`), its database and superadmin (admin@castopod.test) from `spark`, its REST API switched on in the
+  `.env` the image rewrites at each start, `spark fediverse:broadcast` looping in the container. The podcast `@pod` is
+  made and published through its admin pages (`cp_web`, CSRF on each form). `scenarios/castopod.sh`, 15 checks; the
+  episode's sound is made with ffmpeg on the workstation.
 - **Forte (26.9.10, `peers/forte.sh`):** built from its tag by `images/forte` (composer on Hubzilla's PHP image, an nginx
   routing through `index.php?req=`), on the shared MySQL (database `forte`), its `.htconfig.php` written to
   `.state/forte`, a cron sidecar (`src/Daemon/Run.php Cron`). The pasture bundle is mounted over `library/cacert.pem`,
diff --git a/FEDERATION.md b/FEDERATION.md
index ce95084..75f2bd4 100644
--- a/FEDERATION.md
+++ b/FEDERATION.md
@@ -46,6 +46,7 @@ and every run starting clean, with signed fetches required (as privapub.thepra.d
 - **Vernissage 1.43.0**
 - **Hubzilla 11.4.1** with its pubcrawl addon
 - **Forte 26.9.10** (portable identities: actors served through `/.well-known/apgateway/did:key:…`)
+- **Castopod 1.15.5** (podcasts as actors, their episodes with the sound)
 - **Activity-Relay 2.0.9** and **aode-relay 0.3.129**, as relays PrivaPub reads from
 - in the town only (a seeded community checked server by server): **Hollo 0.9.19**, **Iceshrimp.NET 2026.1.2-beta**,
   **Pleroma 2.10.2**
diff --git a/docs/INTEROP.md b/docs/INTEROP.md
index ed11025..942b788 100644
--- a/docs/INTEROP.md
+++ b/docs/INTEROP.md
@@ -854,6 +854,22 @@ without a port, before it gives out its OAuth client.
   never as the relay's boost), and nobody's home; a persona's public post goes to the relays, nothing less public, and
   reaches Mastodon through both (forwarded on its proof, and announced).
 
+### Castopod 1.15.5
+
+- **A podcast is the actor** (`@pod@castopod.test`); its people are not. It accepts follows by itself.
+- **An episode goes out as a Note that only links to the episode's page**; the page serves a `PodcastEpisode` (its words
+  in `description`, its sound in `audio`, its cover in `image`). PrivaPub reads `PodcastEpisode`, and a Note that is
+  only a link to its author's episode takes the episode's sound, title, cover and words (one signed fetch), so the post
+  plays.
+- **Publishes NodeInfo2 only** (`/.well-known/x-nodeinfo2`); PrivaPub's server description falls back to it.
+- **Running it:** the official image on the shared MySQL with a file cache; `spark install:init-database` (a second run
+  stops before seeding: `db:seed AppSeeder`) and `install:create-superadmin`; a podcast is made and published only
+  through its admin pages (a 1400px square cover, a 3:1 banner and an empty `location_name` are required, or the form
+  fails); episodes through its REST API (`restapi.*` appended to the `.env` it writes at each start); its fediverse
+  queue goes out through `spark fediverse:broadcast`.
+- **Pasture evidence (2026-10-06, `tools/pasture/scenarios/castopod.sh`):** 15 checks pass: alice follows the podcast,
+  an episode reaches her with its sound, her like, boost and comment land there, the unfollow, statistics.
+
 ### Forte 26.9.10
 
 - **Portable identities (FEP-ef61):** a channel's actor is `https://<server>/.well-known/apgateway/did:key:z6Mk…/actor`,
diff --git a/tools/pasture/Caddyfile b/tools/pasture/Caddyfile
index e3b7baf..89570c4 100644
--- a/tools/pasture/Caddyfile
+++ b/tools/pasture/Caddyfile
@@ -108,6 +108,11 @@ nodebb.test {
 	reverse_proxy pasture-nodebb:4567
 }
 
+castopod.test {
+	tls internal
+	reverse_proxy pasture-castopod:8080
+}
+
 forte.test {
 	tls internal
 	reverse_proxy pasture-forte:8080
diff --git a/tools/pasture/peers/castopod.sh b/tools/pasture/peers/castopod.sh
new file mode 100644
index 0000000..19f7a95
--- /dev/null
+++ b/tools/pasture/peers/castopod.sh
@@ -0,0 +1,96 @@
+# Castopod 1.15.5: podcasts as ActivityPub actors, their episodes as posts with the audio. The official image (FrankenPHP
+# on 8080) on the shared MySQL (database castopod), its cache in files (the shared Redis has no database left), HTTPS
+# left to Caddy (CP_DISABLE_HTTPS). It trusts Caddy's CA through the bundle mounted as its system store. Its database
+# and superadmin come from its spark commands; its fediverse queue goes out only through `spark fediverse:broadcast`,
+# run each minute in the container. A podcast is made through its admin pages (they alone take one); episodes through
+# its REST API, switched on with basic authentication.
+CASTOPOD_IMAGE=${CASTOPOD_IMAGE:-docker.io/castopod/castopod:1.15.5}
+CASTOPOD_PASSWORD=Castopod-Pasture-1
+CASTOPOD_API=pasture:Castopod-Api-1
+. "$here/peers/shared.sh"
+
+castopod_spark() { podman exec -w /var/www/html pasture-castopod php spark "$@"; }
+
+castopod_up() {
+	shared_mysql_up
+	mysql_db castopod
+	mkdir -p "$here/.state/castopod"
+	[ -s "$here/.state/castopod/env" ] || {
+		echo "CP_BASEURL=https://castopod.test"
+		echo "CP_MEDIA_BASEURL=https://castopod.test"
+		echo -e "CP_DATABASE_HOSTNAME=mysql\nCP_DATABASE_NAME=castopod\nCP_DATABASE_USERNAME=pasture\nCP_DATABASE_PASSWORD=pasture"
+		echo "CP_ANALYTICS_SALT=$(openssl rand -hex 32)"
+		echo -e "CP_CACHE_HANDLER=file\nCP_DISABLE_HTTPS=1"
+	} > "$here/.state/castopod/env"
+	podman volume exists pasture-castopod-media || podman volume create --label pasture=1 pasture-castopod-media >/dev/null
+	podman run -d --replace --name pasture-castopod --network $net --label pasture=1 --env-file "$here/.state/castopod/env" \
+		-v pasture-castopod-media:/var/www/html/public/media -v "$ca/bundle.pem:/etc/ssl/certs/ca-certificates.crt:z,ro" \
+		"$CASTOPOD_IMAGE" >/dev/null
+	for _ in $(seq 1 90); do
+		podman exec pasture-castopod test -f /var/www/html/.env 2>/dev/null && castopod_spark list >/dev/null 2>&1 && break
+		sleep 2
+	done
+	castopod_spark install:init-database >/dev/null 2>&1
+	# (a second init stops at the first migration it already ran, before seeding: the categories and languages it needs)
+	[ "$(podman exec pasture-mysql mysql -upasture -ppasture castopod -Nse "select count(*) from cp_categories" 2>/dev/null)" != "0" ] \
+		|| castopod_spark db:seed AppSeeder >/dev/null 2>&1
+	printf '%s\n%s\n' "$CASTOPOD_PASSWORD" "$CASTOPOD_PASSWORD" \
+		| podman exec -i -w /var/www/html pasture-castopod php spark install:create-superadmin -n admin -e admin@castopod.test >/dev/null 2>&1 || true
+	# its REST API, which makes and publishes episodes, with basic authentication
+	# (the image writes .env anew at each start, read-only)
+	podman exec -u root pasture-castopod sh -c "chmod u+w /var/www/html/.env; grep -q '^restapi.enabled' /var/www/html/.env \
+		|| printf 'restapi.enabled=true\nrestapi.basicAuth=true\nrestapi.basicAuthUsername=${CASTOPOD_API%%:*}\nrestapi.basicAuthPassword=${CASTOPOD_API#*:}\n' >> /var/www/html/.env; chmod a-w /var/www/html/.env"
+	podman exec -d -w /var/www/html pasture-castopod sh -c 'while true; do php spark fediverse:broadcast >/dev/null 2>&1; sleep 30; done'
+	for _ in $(seq 1 60); do
+		site castopod.test -s -o /dev/null -w '%{http_code}' https://castopod.test:6443/.well-known/nodeinfo 2>/dev/null | grep -q 200 && break
+		sleep 2
+	done
+	castopod_podcast
+	echo "castopod: https://castopod.test:6443"
+}
+
+# cp_web <curl args...>: Castopod's admin pages as its superadmin, signed in (a CSRF token on every form)
+cp_web() {
+	local jar="$here/.state/castopod/admin.cookies"
+	if ! site castopod.test -s -b "$jar" -o /dev/null -w '%{http_code}' https://castopod.test:6443/cp-admin | grep -q 200; then
+		rm -f "$jar"
+		local token
+		token=$(site castopod.test -s -c "$jar" https://castopod.test:6443/cp-auth/login | grep -oE 'name="csrf_test_name" value="[^"]+"' | head -1 | sed 's/.*value="//;s/"//')
+		site castopod.test -s -o /dev/null -b "$jar" -c "$jar" -X POST https://castopod.test:6443/cp-auth/login --data-urlencode "csrf_test_name=$token" \
+			-d email=admin@castopod.test --data-urlencode "password=$CASTOPOD_PASSWORD"
+	fi
+	site castopod.test -s -b "$jar" -c "$jar" "$@"
+}
+cp_token() { cp_web "https://castopod.test:6443$1" | grep -oE 'name="csrf_test_name" value="[^"]+"' | head -1 | sed 's/.*value="//;s/"//'; }
+
+# square(file, side) / banner: the pictures a podcast must have (a 1400px square cover, a 3:1 banner)
+cp_picture() { python3 -c "
+import struct,zlib
+w,h=$2,$3
+raw=(b'\x00'+bytes([40,120,200])*w)*h
+png=b'\x89PNG\r\n\x1a\n'+b''.join(struct.pack('>I',len(c))+t+c+struct.pack('>I',zlib.crc32(t+c)&0xffffffff) for t,c in [(b'IHDR',struct.pack('>IIBBBBB',w,h,8,2,0,0,0)),(b'IDAT',zlib.compress(raw,9)),(b'IEND',b'')])
+open('$1','wb').write(png)"; }
+
+# the podcast @pod: only its admin pages make one (its banner is required too, and an absent location fails it)
+castopod_podcast() {
+	[ -n "$(podman exec pasture-mysql mysql -upasture -ppasture castopod -Nse "select id from cp_podcasts where handle = 'pod'" 2>/dev/null)" ] && return 0
+	local category
+	category=$(podman exec pasture-mysql mysql -upasture -ppasture castopod -Nse "select id from cp_categories where code = 'technology'" 2>/dev/null)
+	cp_picture "$here/.state/castopod/cover.png" 1400 1400
+	cp_picture "$here/.state/castopod/banner.png" 1500 500
+	cp_web -o /dev/null -X POST https://castopod.test:6443/cp-admin/podcasts/new -F "csrf_test_name=$(cp_token /cp-admin/podcasts/new)" \
+		-F "cover=@$here/.state/castopod/cover.png;type=image/png" -F "banner=@$here/.state/castopod/banner.png;type=image/png" \
+		-F "title=Pasture Podcast" -F "description=A podcast of the pasture" -F type=episodic -F medium=podcast -F language=en \
+		-F "category=$category" -F parental_advisory=clean -F owner_name=Pasture -F owner_email=admin@castopod.test -F handle=pod \
+		-F location_name= -F custom_rss= -F verify_txt=
+	castopod_publish_podcast
+}
+
+# a podcast made is a draft: its pages, its episodes' pages and their objects answer 404 until it is published
+castopod_publish_podcast() {
+	[ "$(podman exec pasture-mysql mysql -upasture -ppasture castopod -Nse "select published_at is not null from cp_podcasts where handle = 'pod'" 2>/dev/null)" = "1" ] && return 0
+	local token
+	token=$(cp_web https://castopod.test:6443/cp-admin/podcasts/1/publish | grep -oE 'name="csrf_test_name" value="[^"]+"' | tail -1 | sed 's/.*value="//;s/"//')
+	cp_web -o /dev/null -X POST https://castopod.test:6443/cp-admin/podcasts/1/publish --data-urlencode "csrf_test_name=$token" \
+		-d client_timezone=UTC -d publication_method=now --data-urlencode "message=The pasture's podcast is on the air"
+}
diff --git a/tools/pasture/scenarios/castopod.sh b/tools/pasture/scenarios/castopod.sh
new file mode 100644
index 0000000..7dec6b7
--- /dev/null
+++ b/tools/pasture/scenarios/castopod.sh
@@ -0,0 +1,59 @@
+# Castopod 1.15.5: alice follows the podcast @pod; an episode published through its REST API reaches her with its audio;
+# her like, reply and boost land on it there; the unfollow; statistics (from NodeInfo2, all Castopod publishes). The
+# episode's sound is made with ffmpeg; Castopod's own fediverse tables (cp_fediverse_*) say what it holds.
+. "$here/peers/castopod.sh"
+CP=https://castopod.test:6443
+cpc() { site castopod.test -s -u "$CASTOPOD_API" "$@"; }
+cp_sql() { podman exec pasture-mysql mysql -upasture -ppasture castopod -Nse "$1" 2>/dev/null; }
+p_home_has() { curl -s -H "$PH" "$P/api/v1/timelines/home?limit=40" | j "print(next(((s.get('reblog') or s)['id'] for s in d if '$1' in ((s.get('reblog') or s)['content'] or '') or '$1' in (((s.get('reblog') or s).get('privapub') or {}).get('title') or '')), ''))"; }
+p_status() { curl -s -H "$PH" "$P/api/v1/statuses/$1" | j "print(d.get('$2'))"; }
+
+echo "castopod"
+[ "$(cpc "$CP/api/rest/v1/podcasts" | j "print(next((p['handle'] for p in d), ''))")" = "pod" ] && ok "Castopod's REST API and the podcast @pod" \
+	|| { ko "Castopod's REST API ($(cpc "$CP/api/rest/v1/podcasts" | head -c 200))"; return 1; }
+PT=$(privapub_token alice_castopod)
+PH="Authorization: Bearer $PT"
+[ -n "$PT" ] && ok "PrivaPub token for alice_castopod" || { ko "PrivaPub token for alice_castopod"; return 1; }
+run=$(date +%s)
+
+echo "  follows"
+pod_on_p=$(curl -s -H "$PH" "$P/api/v2/search?q=pod@castopod.test&resolve=true&type=accounts" | j "print(d['accounts'][0]['id'])")
+[ -n "$pod_on_p" ] && ok "PrivaPub resolves the podcast @pod" || ko "PrivaPub cannot resolve @pod"
+curl -s -o /dev/null -X POST -H "$PH" "$P/api/v1/accounts/$pod_on_p/follow"
+until_true 60 '[ "$(curl -s -H "$PH" "$P/api/v1/accounts/relationships?id[]=$pod_on_p" | j "print(d[0][\"following\"])")" = "True" ]' \
+	&& ok "alice follows @pod (Accept arrived)" || ko "Castopod's Accept never arrived"
+
+echo "  episodes"
+mp3="$here/.state/castopod/episode.mp3"
+[ -s "$mp3" ] || ffmpeg -loglevel error -f lavfi -i "sine=frequency=440:duration=4" -q:a 9 "$mp3"
+episode=$(cpc -X POST "$CP/api/rest/v1/episodes" -F created_by=1 -F updated_by=1 -F podcast_id=1 -F "title=A pasture episode $run" \
+	-F "slug=a-pasture-episode-$run" -F "description=Listen to the meadow $run" -F type=full -F parental_advisory=clean -F location_name= \
+	-F custom_rss= -F "audio_file=@$mp3;type=audio/mpeg" | j "print(d.get('id', ''))")
+[ -n "$episode" ] && ok "Castopod makes the episode" || ko "Castopod refused the episode"
+cpc -o /dev/null -X POST "$CP/api/rest/v1/episodes/$episode/publish" -F created_by=1 -F publication_method=now -F client_timezone=UTC
+castopod_spark fediverse:broadcast >/dev/null 2>&1
+until_true 90 '[ -n "$(p_home_has "A pasture episode $run")" ] || [ -n "$(p_home_has "Listen to the meadow $run")" ]' \
+	&& ok "the episode reaches alice's home" || ko "the episode never reached alice"
+ep_on_p=$(p_home_has "A pasture episode $run"); [ -n "$ep_on_p" ] || ep_on_p=$(p_home_has "Listen to the meadow $run")
+[ "$(curl -s -H "$PH" "$P/api/v1/statuses/$ep_on_p" | j "print(any(m['type'] == 'audio' for m in d['media_attachments']) or bool((d.get('privapub') or {}).get('audio')))")" = "True" ] \
+	&& ok "with its audio" || ko "the episode arrived without its audio ($(curl -s -H "$PH" "$P/api/v1/statuses/$ep_on_p" | head -c 300))"
+ep_uri=$(p_status "$ep_on_p" uri)
+
+echo "  alice answers"
+curl -s -o /dev/null -X POST -H "$PH" "$P/api/v1/statuses/$ep_on_p/favourite"
+until_true 60 '[ "$(cp_sql "select count(*) from cp_fediverse_favourites f join cp_fediverse_actors a on a.id = f.actor_id where a.uri like '"'%alice_castopod%'"'")" -ge 1 ]' \
+	&& ok "alice's like lands on Castopod" || ko "alice's like never reached Castopod"
+curl -s -o /dev/null -X POST -H "$PH" "$P/api/v1/statuses/$ep_on_p/reblog"
+until_true 60 '[ "$(cp_sql "select count(*) from cp_fediverse_posts p join cp_fediverse_actors a on a.id = p.actor_id where a.uri like '"'%alice_castopod%'"' and p.reblog_of_id is not null")" -ge 1 ]' \
+	&& ok "alice's boost lands on Castopod" || ko "alice's boost never reached Castopod"
+curl -s -o /dev/null -X POST -H "$PH" "$P/api/v1/statuses" -d "status=@pod@castopod.test a PrivaPub comment $run&in_reply_to_id=$ep_on_p&visibility=public"
+until_true 60 '[ "$(cp_sql "select count(*) from cp_fediverse_posts where message like '"'%a PrivaPub comment $run%'"' and in_reply_to_id is not null")" -ge 1 ]' \
+	&& ok "alice's comment threads under the episode" || ko "alice's comment never reached Castopod"
+
+echo "  unfollow"
+curl -s -o /dev/null -X POST -H "$PH" "$P/api/v1/accounts/$pod_on_p/unfollow"
+until_true 60 '[ "$(cp_sql "select count(*) from cp_fediverse_follows f join cp_fediverse_actors a on a.id = f.actor_id where a.uri like '"'%alice_castopod%'"'")" = "0" ]' \
+	&& ok "alice's unfollow reaches Castopod" || ko "Castopod still counts alice"
+
+echo "  statistics"
+stats_check castopod.test castopod