diff --git a/.gitignore b/.gitignore
index 011f240..44cc862 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ regression.diffs
 regression.out
 /sql/semver--?.??.?.sql
 /semver-*
+/semver_annotations.json
 /latest-changes.md
 /semver_binary_copy.bin
 /.vscode
diff --git a/Makefile b/Makefile
index 2dd11c6..28187f7 100644
--- a/Makefile
+++ b/Makefile
@@ -6,6 +6,8 @@ DISTVERSION  = $(shell grep -m 1 '[[:space:]]\{3\}"version":' META.json | \
                sed -e 's/[[:space:]]*"version":[[:space:]]*"\([^"]*\)",\{0,1\}/\1/')
 
 MODULEDIR    = $(EXTENSION)
+DESCRIPTION  = A Postgres data type for the Semantic Version format with support for btree and hash indexing.
+REPO_URL     = https://github.com/theory/pg-semver
 DATA         = $(wildcard sql/*--*.sql)
 DOCS         = $(wildcard doc/*.mmd)
 TESTS        = $(wildcard test/sql/*.sql)
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..b1b6d61
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,57 @@
+version: "3.9"
+name: trunking
+
+# Start a Zot service for pushing and pulling OCI images, and a
+# pgxn/pgxn-tools image for building and testing Linux/AMD binaries.
+#
+# docker compose up -d
+# docker compose exec linux bash
+# make clean && make && make trunk
+#
+# On macOS:
+#   make clean && make && make trunk
+#   ./push_trunk localhost:5000/theory/semver semver-0.32.1+pg16-darwin-23.5.0-arm64 semver-0.32.1+pg16-linux-amd64
+#   clean -dfx --exclude=.vscode
+#   find "$(pg_config --sharedir)" "$(pg_config --pkglibdir)" "$(pg_config --docdir)" -name '*semver*'  -exec rm -rf "{}" \;
+#
+#   ./install_trunk localhost:5000/theory/semver:v1
+#   find "$(pg_config --sharedir)" "$(pg_config --pkglibdir)" "$(pg_config --docdir)" -name '*semver*'
+#
+# Back on Linux
+#   ./install_trunk zot:5000/theory/semver:v1
+#   find "$(pg_config --sharedir)" "$(pg_config --pkglibdir)" "$(pg_config --docdir)" -name '*semver*'
+
+# Name the network for all of the services to join.
+networks:
+  default:
+    name: pgxnnet
+
+services:
+  zot:
+    image: ghcr.io/project-zot/zot-linux-arm64:latest
+    container_name: zot
+    ports:
+      - 5000:5000
+    hostname: zot
+
+  linux:
+    image: pgxn/pgxn-tools
+    platform: "linux/amd64"
+    container_name: linux
+    hostname: linux
+    working_dir: /work
+    volumes:
+      - ".:/work"
+    # Install oras, then start Postgres 16 and install rsync and jq
+    entrypoint:
+      - "/bin/sh"
+      - -ecx
+      - |
+          cd /tmp
+          curl -LO "https://github.com/oras-project/oras/releases/download/v1.2.0/oras_1.2.0_linux_amd64.tar.gz"
+          mkdir -p oras-install/
+          tar -zxf oras_1.2.0_*.tar.gz -C oras-install/
+          sudo mv oras-install/oras /usr/local/bin/
+          rm -rf oras_1.2.0_*.tar.gz oras-install/
+          pg-start 16 rsync jq
+          tail -f /dev/null
diff --git a/install_trunk b/install_trunk
index c268bc0..97c6abd 100755
--- a/install_trunk
+++ b/install_trunk
@@ -22,18 +22,27 @@ install_trunk() {
     fi
 
     # Determine the platform.
-    local my_os my_osv my_arch
+    local my_os my_osv my_arch platform
     my_os=$(uname | tr '[:upper:]' '[:lower:]')
     my_osv=$(uname -r)
     my_arch="$(uname -m)"
     if [ "$my_arch" == "x86_64" ]; then my_arch=amd64; fi
+    if [ "$my_os" == "darwin" ]; then
+        platform="$my_os/$my_arch:$my_osv"
+    else
+        platform="$my_os/$my_arch"
+    fi
+
+    # Download.
+    local file
+    file=$(basename "$(oras pull --no-tty --plain-http  --format 'go-template={{(first .files).path}}' --platform "$platform" "$trunk")")
 
     # Unpack.
-    printf "Unpacking %s\n" "$trunk"
-    tar zxf "$trunk"
+    printf "Unpacking %s\n" "$file"
+    tar zxf "$file"
 
     # Go into the directory
-    local dir="${trunk%.*}"
+    local dir="${file%.*}"
     cd "$dir" || exit
 
     # Verify the checksums.
@@ -61,7 +70,7 @@ install_trunk() {
         exit 1
     fi
 
-    printf "Verifying compatibility with %s/%s:%s\n" "$my_os" "$my_arch" "$my_osv"
+    printf "Verifying compatibility with %s\n" "$platform"
     local pkg_os
     pkg_os=$(jq -r .platform.os trunk.json)
     if [ "$pkg_os" != "any" ]; then
diff --git a/push_trunk b/push_trunk
new file mode 100755
index 0000000..b36d574
--- /dev/null
+++ b/push_trunk
@@ -0,0 +1,114 @@
+#!/bin/bash
+
+# POC for publishing Trunk packages to an OCI repository with an image index
+# to allow pulling a platform-specific binary. Requires:
+#
+# * oras
+# * jq
+# * zot: docker run -d -p 5000:5000 --name oras-quickstart ghcr.io/project-zot/zot-linux-arm64:latest
+#
+# Inspired by the Homebrew implementation of the pattern as referenced in
+# https://github.com/oras-project/oras/issues/237, and with thanks to the
+# denizens of the #oras and #zot channels on the CNCF Slack.
+
+trap 'exit' ERR
+set -E
+
+# OCI types to create.
+ARTIFACT_TYPE=application/vnd.pgxn.trunk.layer.v1
+MEDIA_TYPE=application/vnd.oci.image.layer.v1.tar+gzip
+CONFIG_TYPE=application/vnd.oci.image.config.v1+json
+OCI_DIR=oci_dir
+INDEX_FILE=image_index.json
+
+push_image() {
+    # Push the image into the OCI layout directory $OCI_DIR.
+    local trunk=$1
+    oras push --no-tty \
+        --oci-layout "$OCI_DIR" \
+        --artifact-type "${ARTIFACT_TYPE}" \
+        --config "${trunk}_config.json":"$CONFIG_TYPE" \
+        --format go-template='{{.digest}}' \
+        --annotation-file "${trunk}_annotations.json" \
+        "$trunk.trunk":"$MEDIA_TYPE"
+}
+
+make_manifest() {
+    local trunk=$1
+    local digest=$2
+    local anno platform
+
+    # Extract just the pgxn.trunk annotations.
+    anno=$(jq -c \
+        '.["$manifest"] | with_entries(select(.key | startswith("org.pgxn.trunk.")))' \
+        "${trunk}_annotations.json"
+    )
+
+    # Extract the platform config.
+    platform=$(jq \
+        'pick(.os, .["os.version"], .architecture)| with_entries(select(.value |. !=null and . != ""))' \
+        "$trunk"_config.json
+    )
+
+    # Create and return the image manifest.
+    oras manifest fetch --oci-layout "$OCI_DIR@${digest}" --descriptor \
+        | jq --argjson anno "$anno" --argjson platform "$platform" \
+        '{
+            mediaType: .mediaType,
+            size: .size,
+            digest: .digest,
+            platform: $platform,
+            annotations: $anno
+        }'
+}
+
+write_index() {
+    darwin_manifest=$1
+    linux_manifest=$2
+
+    # Build the image index with the two manifests.
+    jq -n --argjson linux "$linux_manifest" \
+        --argjson darwin "$darwin_manifest" \
+        --argjson annotations "$(cat semver_annotations.json)" \
+        '{
+            schemaVersion: 2,
+            mediaType: "application/vnd.oci.image.index.v1+json",
+            manifests: [$linux, $darwin],
+            annotations: $annotations
+        }' > "$INDEX_FILE"
+}
+
+push_trunk() {
+    # Only testing for Darwin and Linux rn.
+    local repo=$1
+    local darwin_trunk=$2
+    local linux_trunk=$3
+
+    if [ -z "$repo" ] || [ -z "$darwin_trunk" ] || [ -z "$linux_trunk" ]; then
+        printf "Usage:\n\n  %s REPO DARWIN.trunk LINUX.trunk\n" "$0"
+        exit 1
+    fi
+
+    # Push the images and grab the resulting digests.
+    darwin_digest=$(push_image "$darwin_trunk")
+    linux_digest=$(push_image "$linux_trunk")
+
+    # Create the image manifests.
+    darwin_manifest=$(make_manifest "$darwin_trunk" "$darwin_digest")
+    linux_manifest=$(make_manifest "$linux_trunk" "$linux_digest")
+
+    # Write out and push the image index.
+    write_index "$darwin_manifest" "$linux_manifest"
+    oras manifest push --oci-layout ./"$OCI_DIR":image-index "$INDEX_FILE"
+
+    # Push everything from the local layout to the remote registry.
+    oras cp --from-oci-layout ./"$OCI_DIR":image-index --to-plain-http "${repo}:v1"
+
+    # View the remote image index manifest.
+    oras manifest get --plain-http "${repo}:v1" | jq
+
+    # Cleanup.
+    rm -rf "$OCI_DIR" "$INDEX_FILE"
+}
+
+push_trunk "$@"
diff --git a/trunk.mk b/trunk.mk
index 4a23894..b2ec09c 100644
--- a/trunk.mk
+++ b/trunk.mk
@@ -1,10 +1,16 @@
 # Trunk packaging. To use, create a standard PGXS Makefile for your extension.
-# The only extra variables are DISTVERSION, LICENSE, and LANGUAGE.
+# The only extra variables are DISTVERSION, TITLE, DESCRIPTION, LICENSE,
+# LANGUAGE, VENDOR, URL, and REPO_URL.
 #
 # ``` make
 # DISTVERSION  = 1.2.1
+# TITLE        = Bike
+# DESCRIPTION  = A bicycle inside your database.
 # LICENSE      = mit
 # LANGUAGE     = c
+# VENDOR       = PGXN
+# URL          = https://pgxn.org/dist/bike
+# REPO_URL     = https://github.com/pgxn/bike
 #
 # EXTENSION    = bike
 # MODULEDIR    = $(EXTENSION)
@@ -38,6 +44,9 @@
 
 LAUNGUAGE      ?= c
 LICENSE        ?= PostgreSQL
+TITLE          ?= $(EXTENSION)
+VENDOR         ?= PGXN
+URL            ?= $(REPO_URL)
 
 pkg_arch       := $(shell uname -m)
 ifeq ($(pkg_arch),x86_64)
@@ -64,7 +73,52 @@ pkg_info_files ?= $(wildcard README* readme* Readme* LICENSE* license* License*
 EXTRA_CLEAN    += $(EXTENSION)-$(DISTVERSION)+*/
 
 # Phony target to create the trunk and OCI JSON files.
-trunk: $(pkg).trunk
+trunk: $(pkg).trunk $(pkg)_config.json $(pkg)_annotations.json $(EXTENSION)_annotations.json
+
+# Use jq to create the OCI image index annoations.
+# https://github.com/opencontainers/image-spec/blob/main/annotations.md
+$(EXTENSION)_annotations.json:
+	jq -n \
+	    --arg org.opencontainers.image.created "$$(date +%Y-%m-%dT%TZ)" \
+		--arg org.opencontainers.image.licenses "$(LICENSE)" \
+		--arg org.opencontainers.image.title "$(TITLE)" \
+		--arg org.opencontainers.image.description "$(DESCRIPTION)" \
+		--arg org.opencontainers.image.source "$(REPO_URL)" \
+		--arg org.opencontainers.image.vendor "$(VENDOR)" \
+		--arg org.opencontainers.image.ref.name "$(DISTVERSION)" \
+		--arg org.opencontainers.image.version "$(DISTVERSION)" \
+		--arg org.opencontainers.image.url "$(URL)" \
+		'$$ARGS.named | with_entries(select(.value |. !=null and . != ""))' > $@
+
+# Use jq to create the OCI image configuration.
+$(pkg)_config.json:
+	@jq -n \
+		--arg os "$(PORTNAME)" \
+		--arg os.version "$(pkg_os_ver)" \
+		--arg architecture "$(pkg_arch)" \
+		--arg created "$$(date +%Y-%m-%dT%TZ)" \
+		'$$ARGS.named | with_entries(select(.value |. !=null and . != ""))' > $@
+
+# Use jq to create the OCI image manifest annotations.
+$(pkg)_annotations.json: $(pkg).trunk $(pkg)_config.json
+	@anno=$$(jq -n \
+	    --arg org.opencontainers.image.created "$$(date +%Y-%m-%dT%TZ)" \
+		--arg org.opencontainers.image.title "$(pkg).trunk" \
+		--arg org.opencontainers.image.licenses "$(LICENSE)" \
+		--arg org.opencontainers.image.description "$(DESCRIPTION)" \
+		--arg org.opencontainers.image.source "$(REPO_URL)" \
+		--arg org.opencontainers.image.vendor "$(VENDOR)" \
+		--arg org.opencontainers.image.ref.name "$(DISTVERSION)" \
+		--arg org.opencontainers.image.version "$(DISTVERSION)" \
+		--arg org.opencontainers.image.url "$(URL)" \
+		--arg org.pgxn.trunk.pg.version "$(VERSION)" \
+		--arg org.pgxn.trunk.pg.major "$(MAJORVERSION)" \
+		--arg org.pgxn.trunk.pg.version_num "$(VERSION_NUM)" \
+		--arg org.pgxn.trunk.version "0.1.0" \
+		'$$ARGS.named | with_entries(select(.value |. !=null and . != ""))' \
+	) && jq -n \
+		--argjson '$$manifest' "$$anno" \
+		'$$ARGS.named' > $@
 
 $(pkg).trunk: package
 	tar zcvf $@ $(pkg_dir)