diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/integration_test.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/integration_test.go
index fd1ec37a..a0af01fb 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/integration_test.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/integration_test.go
@@ -8,6 +8,8 @@ import (
 	"errors"
 	"fmt"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"io"
 	"maps"
 	"mesh-delivery-assigner/internal/buckets"
@@ -246,7 +248,7 @@ func TestTheAssignerDoesNotStartWithoutABucketItReads(t *testing.T) {
 		t.Fatal(err)
 	}
 	pkey, _ := delivery.PutKey("n1", "web")
-	asked := delivery.Put{FP: delivery.SourcePrefix2 + strings.Repeat("b", 64), Why: "a try", At: time.Now()}.Said(time.Now(), delivery.PutAsked, "asked")
+	asked := delivery.Put{FP: meshcatalogclient.SourcePrefix2 + strings.Repeat("b", 64), Why: "a try", At: time.Now()}.Said(time.Now(), delivery.PutAsked, "asked")
 	raw, _ := delivery.EncodePut(asked)
 	if _, err := puts.Put(b.ctx, pkey, raw); err != nil {
 		t.Fatal(err)
@@ -340,9 +342,9 @@ func (b *bed) compose(t *testing.T, node string, d byte) string {
 // manifest keeps a manifest in the indexer's bucket by its digest and answers the digest.
 func (b *bed) manifest(t *testing.T, module, body string) string {
 	t.Helper()
-	digest := delivery.ManifestDigest([]byte(body))
-	key, _ := delivery.ManifestsKey(digest)
-	value, err := delivery.EncodeManifest(delivery.Manifest{Module: module, JSON: body})
+	digest := meshcatalogclient.ManifestDigest([]byte(body))
+	key, _ := meshcatalogclient.ManifestsKey(digest)
+	value, err := meshcatalogclient.EncodeManifest(meshcatalog.ManifestsByDigestValue{Module: module, Manifest: body})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -383,9 +385,9 @@ func TestWantsAreWrittenAndNoDifferenceIs(t *testing.T) {
 		}
 	}
 	b := startBed(t, "")
-	fNew, fOld := delivery.SourcePrefix2+strings.Repeat("b", 64), delivery.SourcePrefix2+strings.Repeat("a", 64)
+	fNew, fOld := meshcatalogclient.SourcePrefix2+strings.Repeat("b", 64), meshcatalogclient.SourcePrefix2+strings.Repeat("a", 64)
 	digest := b.manifest(t, "web", `{"module":"web","version":"1"}`)
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fNew, Manifest: digest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fNew, Manifest: digest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 	b.putJSON(t, buckets.Modules, "web", mod)
 	built, err := delivery.EncodeBuilderBuild(delivery.BuilderBuild{State: delivery.BuildDone, By: "builder.novox.1", Step: "pushed", Manifest: digest})
 	if err != nil {
@@ -526,12 +528,12 @@ func TestWantsAreWrittenAndNoDifferenceIs(t *testing.T) {
 	}
 	// The provisioner keys it from the manifests, as soon as they are known and whether the provider is placed yet or not.
 	asked(provisions.Asked, "the provider's build is not done")
-	fpOf := func(c byte) string { return delivery.SourcePrefix2 + strings.Repeat(string(c), 64) }
+	fpOf := func(c byte) string { return meshcatalogclient.SourcePrefix2 + strings.Repeat(string(c), 64) }
 	toolOld := fpOf('1')
 	for module, row := range map[string]struct {
 		fp, digest string
 	}{"db": {fpOf('2'), dbDigest}, "app": {fpOf('3'), appDigest}, "tool": {fpOf('4'), toolDigest}} {
-		mod, _ := delivery.EncodeModule(delivery.Module{FP2: row.fp, Manifest: row.digest, Repository: "novox/" + module, Commit: strings.Repeat("2", 40), Path: delivery.RootPath})
+		mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: row.fp, Manifest: row.digest, Repository: "novox/" + module, Commit: strings.Repeat("2", 40), Path: meshcatalogclient.RootPath})
 		b.putJSON(t, buckets.Modules, module, mod)
 		fps := []string{row.fp}
 		if module == "tool" {
@@ -590,7 +592,7 @@ func TestWantsAreWrittenAndNoDifferenceIs(t *testing.T) {
 	formsOld, formsNew := fpOf('5'), fpOf('6')
 	formsDigest := b.manifest(t, "forms", `{"module":"forms","version":"1"}`)
 	formsAt := func(fp string) {
-		mod, _ := delivery.EncodeModule(delivery.Module{FP2: fp, Manifest: formsDigest, Repository: "novox/forms", Commit: strings.Repeat("3", 40), Path: delivery.RootPath})
+		mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fp, Manifest: formsDigest, Repository: "novox/forms", Commit: strings.Repeat("3", 40), Path: meshcatalogclient.RootPath})
 		b.putJSON(t, buckets.Modules, "forms", mod)
 	}
 	for _, fp := range []string{formsOld, formsNew} {
@@ -679,9 +681,9 @@ func (s bedState) Await(key string, after uint64, done func([]byte) bool, bound
 // the one its manifest declares (ownBuckets, held equal to the manifest by TestOpensWhatItsManifestNames).
 func TestAHeldFingerprintIsAskedAbout(t *testing.T) {
 	b := startBed(t, "")
-	fNew := delivery.SourcePrefix2 + strings.Repeat("c", 64)
+	fNew := meshcatalogclient.SourcePrefix2 + strings.Repeat("c", 64)
 	digest := b.manifest(t, "web", `{"module":"web","version":"1"}`)
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fNew, Manifest: digest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fNew, Manifest: digest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 	b.putJSON(t, buckets.Modules, "web", mod)
 	on, _ := delivery.EncodePresence(delivery.Presence{Online: true})
 	b.putJSON(t, buckets.Presence, "ace", on)
@@ -737,9 +739,9 @@ func (b *bed) conditionsSaid(t *testing.T) map[string]oc.Condition {
 // and the check's words.
 func TestAFailedDataModuleIsAskedToRestore(t *testing.T) {
 	b := startBed(t, "")
-	fNew := delivery.SourcePrefix2 + strings.Repeat("d", 64)
+	fNew := meshcatalogclient.SourcePrefix2 + strings.Repeat("d", 64)
 	digest := b.manifest(t, "mail", `{"module":"mail","version":"1","resources":[{"id":"data","type":"directory","path":"/var/lib/mail"}],"data":{"own":[{"id":"mail","path":"${dir:data}","class":"irreplaceable","backup":"copy"}]}}`)
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fNew, Manifest: digest, Repository: "novox/mail", Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fNew, Manifest: digest, Repository: "novox/mail", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 	b.putJSON(t, buckets.Modules, "mail", mod)
 	on, _ := delivery.EncodePresence(delivery.Presence{Online: true})
 	b.putJSON(t, buckets.Presence, "ace", on)
@@ -787,9 +789,9 @@ func TestTheAssignerReplacedResumesWithNothingLostOrRepeated(t *testing.T) {
 	for i := range names {
 		name := fmt.Sprintf("mod%02d", i)
 		names[i] = name
-		fp := delivery.SourcePrefix2 + strings.Repeat(string(rune('a'+i%6)), 63) + fmt.Sprintf("%x", i%16)
+		fp := meshcatalogclient.SourcePrefix2 + strings.Repeat(string(rune('a'+i%6)), 63) + fmt.Sprintf("%x", i%16)
 		digest := b.manifest(t, name, fmt.Sprintf(`{"module":%q,"version":"1"}`, name))
-		mod, _ := delivery.EncodeModule(delivery.Module{FP2: fp, Manifest: digest, Repository: "novox/" + name, Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+		mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fp, Manifest: digest, Repository: "novox/" + name, Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 		b.putJSON(t, buckets.Modules, name, mod)
 		built, err := delivery.EncodeBuilderBuild(delivery.BuilderBuild{State: delivery.BuildDone, By: "builder.novox.1", Step: "pushed", Manifest: digest})
 		if err != nil {
@@ -835,7 +837,7 @@ func TestTheAssignerReplacedResumesWithNothingLostOrRepeated(t *testing.T) {
 func (b *bed) fixture(t *testing.T, name, fp, manifest string) {
 	t.Helper()
 	digest := b.manifest(t, name, manifest)
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fp, Manifest: digest, Repository: "novox/" + name, Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fp, Manifest: digest, Repository: "novox/" + name, Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 	b.putJSON(t, buckets.Modules, name, mod)
 	built, _ := delivery.EncodeBuilderBuild(delivery.BuilderBuild{State: delivery.BuildDone, By: "builder.novox.1", Step: "pushed", Manifest: digest})
 	bkey, _ := delivery.BuilderBuildKey(name, fp)
@@ -906,7 +908,7 @@ func (b *bed) hasKey(bucket, key string) bool {
 // and clears the condition.
 func TestAReleaseAnswerWritesTheWantAgain(t *testing.T) {
 	b := startBed(t, "")
-	fNew, fOld := delivery.SourcePrefix2+strings.Repeat("b", 64), delivery.SourcePrefix2+strings.Repeat("a", 64)
+	fNew, fOld := meshcatalogclient.SourcePrefix2+strings.Repeat("b", 64), meshcatalogclient.SourcePrefix2+strings.Repeat("a", 64)
 	b.fixture(t, "web", fNew, `{"module":"web","version":"1"}`)
 	b.compose(t, "ace", 'b')
 	b.compose(t, "ace", 'a')
@@ -958,7 +960,7 @@ func (b *bed) askNow(t *testing.T, key string, asking int) decodedAsk {
 // value, so the node retries.
 func TestABackupAnswerIsWrittenIntoTheNodesWant(t *testing.T) {
 	b := startBed(t, "")
-	fNew := delivery.SourcePrefix2 + strings.Repeat("b", 64)
+	fNew := meshcatalogclient.SourcePrefix2 + strings.Repeat("b", 64)
 	b.fixture(t, "web", fNew, `{"module":"web","version":"1"}`)
 	b.compose(t, "ace", 'b')
 	b.putWant(t, "ace", "web", delivery.Want{FP: fNew, Self: true}) // a placed node's want names the build alone
@@ -1002,7 +1004,7 @@ const recorded = `{"module":"web","version":"1","upgrade":{"policy":"record","wh
 // cleared saying why, and the want stays at the fingerprint.
 func TestAHoldIsLiftedOnceEveryNodeRunsItHealthy(t *testing.T) {
 	b := startBed(t, "")
-	fNew := delivery.SourcePrefix2 + strings.Repeat("b", 64)
+	fNew := meshcatalogclient.SourcePrefix2 + strings.Repeat("b", 64)
 	b.fixture(t, "web", fNew, `{"module":"web","version":"1"}`)
 	b.compose(t, "ace", 'b')
 	failed, _ := nodeengineclient.EncodeHave(nodeengine.HaveByNodeModuleValue{Fp: fNew, Phase: nodeengineclient.PhaseRunning, Health: nodeengineclient.HealthFailed, Detail: "connection refused"})
@@ -1035,7 +1037,7 @@ func TestAHoldIsLiftedOnceEveryNodeRunsItHealthy(t *testing.T) {
 // new id, so the teller raises it; the answer to the first hold does not carry over (1906/H4).
 func TestAHoldWrittenAgainAfterALiftAndARestartIsAskedAgain(t *testing.T) {
 	b := startBed(t, "")
-	fNew := delivery.SourcePrefix2 + strings.Repeat("b", 64)
+	fNew := meshcatalogclient.SourcePrefix2 + strings.Repeat("b", 64)
 	b.fixture(t, "web", fNew, `{"module":"web","version":"1"}`)
 	b.compose(t, "ace", 'b')
 	failed, _ := nodeengineclient.EncodeHave(nodeengine.HaveByNodeModuleValue{Fp: fNew, Phase: nodeengineclient.PhaseRunning, Health: nodeengineclient.HealthFailed, Detail: "connection refused"})
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass.go
index 4a7ac479..161c1dc4 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"maps"
 	"mesh-delivery-assigner/internal/buckets"
 	"slices"
@@ -200,7 +201,7 @@ func (p *passer) wants(ctx context.Context) {
 	served := p.served(ctx, get, moduleGraph, nodes)
 	offering := p.offering(ctx, get, manifests, nodes) // bus state (ADR 0614 §5)
 	for name := range names {
-		fp := trunk[name].FP2
+		fp := trunk[name].Fp2
 		name := name
 		m := assign.Module{Name: name, FP: fp, Manifest: manifests[name], Needs: trunk[name].Needs, Chosen: chosenOf(chosen, name), Provisions: provisionsOf(name), Answering: answering(manifests, nodes), Offered: offered(manifests), Nodes: nodesOf[name], Now: time.Now(), Puts: puts[name], FormNeeds: p.w.buildNeeds(name, fp),
 			Self: func(node string) bool { return placed[node] },
@@ -601,7 +602,7 @@ func (p *passer) lift(ctx context.Context, module, fp string) {
 // controller no longer composes for the node at that fingerprint. A backup ask and an ask of another kind are never stale here.
 // A module of the trunk whose fingerprint is not read yet, and a composition not read yet, are not stale: nothing known is
 // nothing taken away.
-func (p *passer) staleAsk(key string, trunk map[string]delivery.Module) bool {
+func (p *passer) staleAsk(key string, trunk map[string]meshcatalog.ModulesByModuleValue) bool {
 	k, err := delivery.ParseAnyAskKey(key)
 	if err != nil {
 		return false
@@ -609,7 +610,7 @@ func (p *passer) staleAsk(key string, trunk map[string]delivery.Module) bool {
 	switch k.Kind {
 	case delivery.AskKindHold, delivery.AskKindRestore:
 		m, on := trunk[k.Module]
-		return !on || (m.FP2 != "" && m.FP2 != k.FP)
+		return !on || (m.Fp2 != "" && m.Fp2 != k.FP)
 	case delivery.AskKindRecord:
 		m, on := trunk[k.Module]
 		if !on {
@@ -627,13 +628,13 @@ func (p *passer) staleAsk(key string, trunk map[string]delivery.Module) bool {
 		// revised composition of the fingerprint it runs (ADR 0545), and a node's first want at the older fingerprint it runs. So a
 		// record ask is stale only when its digest is the composition of none of the fingerprints the node can still want (the
 		// trunk's, its want's, its have's), and only when every one of them is read.
-		for _, fp := range p.fingerprintsOf(k.Node, k.Module, m.FP2) {
+		for _, fp := range p.fingerprintsOf(k.Node, k.Module, m.Fp2) {
 			d, ok := p.w.composed(k.Node, k.Module, fp)
 			if !ok || d.Digest == k.Composed {
 				return false
 			}
 		}
-		return len(p.fingerprintsOf(k.Node, k.Module, m.FP2)) > 0
+		return len(p.fingerprintsOf(k.Node, k.Module, m.Fp2)) > 0
 	}
 	return false
 }
@@ -664,7 +665,7 @@ func (p *passer) fingerprintsOf(node, module, trunkFP string) []string {
 // staleAsks takes away, at every pass, each hold, restore and record ask that staleAsk names (issue 1906, note 28): an ask
 // outlived its fingerprint, and the teller takes its router ask back from the operator when the key goes. With the trunk not
 // read at all (no module), nothing is taken away.
-func (p *passer) staleAsks(ctx context.Context, trunk map[string]delivery.Module) {
+func (p *passer) staleAsks(ctx context.Context, trunk map[string]meshcatalog.ModulesByModuleValue) {
 	if len(trunk) == 0 {
 		return
 	}
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass_test.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass_test.go
index 33589508..4698a858 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass_test.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/pass_test.go
@@ -7,6 +7,8 @@ import (
 	"errors"
 	"fmt"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"mesh-delivery-assigner/internal/buckets"
 	"slices"
 	"strings"
@@ -88,7 +90,7 @@ func composes(t *testing.T, w *world, node, digest string) {
 	w.put(buckets.Have, key, raw)
 }
 
-var fpTest = delivery.SourcePrefix2 + strings.Repeat("b", 64)
+var fpTest = meshcatalogclient.SourcePrefix2 + strings.Repeat("b", 64)
 
 // 1906/H2: given a hold lifted by itself, when the assigner is started again and the same fingerprint is held again, then the
 // hold ask is written under another asking, with an id of its own, so the teller raises it (the router drops a second ask under
@@ -315,7 +317,7 @@ func (b *fakeBus) Emit(eventType string, body any) error {
 func putOfTheBus(t *testing.T) {
 	ctx := context.Background()
 	now := time.Date(2026, 10, 25, 22, 0, 0, 0, time.UTC)
-	fp := delivery.SourcePrefix2 + "fd497ab8" + strings.Repeat("0", 56)
+	fp := meshcatalogclient.SourcePrefix2 + "fd497ab8" + strings.Repeat("0", 56)
 	digest := "sha256:" + strings.Repeat("d", 64)
 	mem := func() *memKV { return &memKV{values: map[string][]byte{}} }
 	puts, asksKV, wantsKV := mem(), mem(), mem()
@@ -340,14 +342,14 @@ func putOfTheBus(t *testing.T) {
 	}
 	placeOn(t, p.w, "novox", "nats")
 	mdigest := strings.Repeat("e", 64)
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fp, Manifest: mdigest, Repository: "novox/mesh-catalog", Commit: strings.Repeat("c", 40)})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fp, Manifest: mdigest, Repository: "novox/mesh-catalog", Commit: strings.Repeat("c", 40)})
 	world(buckets.Modules, "nats", mod)
 	p.w.manifests[mdigest] = parsed{module: "nats", manifest: catalogue.Manifest{Module: "nats", Provides: []catalogue.Offer{{Name: "mesh-bus"}}}}
 	bkey, _ := delivery.BuilderBuildKey("nats", fp)
 	built, _ := delivery.EncodeBuilderBuild(delivery.BuilderBuild{State: delivery.BuildDone, Manifest: mdigest})
 	world(buckets.Builds, bkey, built)
 	hkey, _ := nodeengineclient.HaveKey("novox", "nats")
-	before, _ := nodeengineclient.EncodeHave(nodeengine.HaveByNodeModuleValue{Fp: delivery.SourcePrefix2 + strings.Repeat("a", 64), Phase: nodeengineclient.PhaseRunning, Health: nodeengineclient.HealthOK})
+	before, _ := nodeengineclient.EncodeHave(nodeengine.HaveByNodeModuleValue{Fp: meshcatalogclient.SourcePrefix2 + strings.Repeat("a", 64), Phase: nodeengineclient.PhaseRunning, Health: nodeengineclient.HealthOK})
 	world(buckets.Have, hkey, before)
 
 	builds := mem()
@@ -464,7 +466,7 @@ func putOfTheBus(t *testing.T) {
 	}
 	<-woke
 	// Released between the pass's read and its write: the pass writes no want for the put that no longer stands.
-	oldWant, _ := delivery.EncodeWant(delivery.Want{FP: delivery.SourcePrefix2 + strings.Repeat("a", 64)})
+	oldWant, _ := delivery.EncodeWant(delivery.Want{FP: meshcatalogclient.SourcePrefix2 + strings.Repeat("a", 64)})
 	wantsKV.values["want.novox.nats"] = oldWant
 	world(buckets.Wants, "want.novox.nats", oldWant)
 	if _, err := s.doRelease(map[string]any{"node": "novox", "module": "nats", "why": "changed my mind"}, "shanks.node-tools"); err != nil {
@@ -655,7 +657,7 @@ func TestTheFirstPassAfterAStartClearsWhatAPreviousProcessRaised(t *testing.T) {
 	p := newPasser(kvSet{buckets.Wants: wantsKV, buckets.Asks: &memKV{values: map[string][]byte{}}}, time.Now())
 	var said []oc.Condition
 	p.say = func(c oc.Condition) error { said = append(said, c); return nil }
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fpTest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fpTest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 	p.w.put(buckets.Modules, "web", mod)
 	placeOn(t, p.w, "g14", "web")
 	on, _ := delivery.EncodePresence(delivery.Presence{Online: true})
@@ -693,7 +695,7 @@ func testAHeldModuleRaisesNoNeitherAndClearsAStandingOne(t *testing.T) {
 		p := newPasser(kvSet{buckets.Wants: &memKV{values: map[string][]byte{}}, buckets.Asks: &memKV{values: map[string][]byte{}}}, time.Now())
 		said := &[]oc.Condition{}
 		p.say = func(c oc.Condition) error { *said = append(*said, c); return nil }
-		mod, _ := delivery.EncodeModule(delivery.Module{FP2: fpTest, Repository: "novox/resolved", Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+		mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fpTest, Repository: "novox/resolved", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 		p.w.put(buckets.Modules, "systemd-resolved", mod)
 		placeOn(t, p.w, "shanks", "systemd-resolved")
 		on, _ := delivery.EncodePresence(delivery.Presence{Online: true})
@@ -740,10 +742,10 @@ func testAHeldModuleRaisesNoNeitherAndClearsAStandingOne(t *testing.T) {
 // fingerprint (or composition) is not the trunk's now, or whose module left the trunk; a trunk not read takes nothing away; a
 // backup ask is left; and a lift takes the restore asks of its fingerprint on every node.
 func TestAsksOfAFingerprintTheTrunkLeftBehindAreTakenAway(t *testing.T) {
-	fpOld, fpNew := delivery.SourcePrefix2+strings.Repeat("a", 64), delivery.SourcePrefix2+strings.Repeat("c", 64)
+	fpOld, fpNew := meshcatalogclient.SourcePrefix2+strings.Repeat("a", 64), meshcatalogclient.SourcePrefix2+strings.Repeat("c", 64)
 	digOld, digNew := "sha256:"+strings.Repeat("d", 64), "sha256:"+strings.Repeat("e", 64)
-	trunkOf := func(fp string) map[string]delivery.Module {
-		return map[string]delivery.Module{"web": {FP2: fp, Manifest: "sha256:" + strings.Repeat("1", 64), Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: delivery.RootPath}}
+	trunkOf := func(fp string) map[string]meshcatalog.ModulesByModuleValue {
+		return map[string]meshcatalog.ModulesByModuleValue{"web": {Fp2: fp, Manifest: "sha256:" + strings.Repeat("1", 64), Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath}}
 	}
 	type ask struct{ name, key string }
 	holdOld, _ := delivery.HoldAskKey("web", fpOld)
@@ -757,7 +759,7 @@ func TestAsksOfAFingerprintTheTrunkLeftBehindAreTakenAway(t *testing.T) {
 	all := []string{holdOld, holdNew, holdGone, restOld, restNew, recOld, recNew, backOld}
 	for _, c := range []struct {
 		name    string
-		trunk   map[string]delivery.Module
+		trunk   map[string]meshcatalog.ModulesByModuleValue
 		gone    []string // the keys taken away
 		noDigit bool     // the node's own composition is not read
 	}{
@@ -899,7 +901,7 @@ func TestARecordAskOfAHeldBackNodeSurvivesPassesAndItsYesMovesTheWant(t *testing
 // given its yes by that Approve, the want naming the release, and no record ask is raised; a move that changes a setting or a
 // secret too, one at the build it runs, and one no approved release carries are asked of a person as before.
 func aReleasesApproveAnswersTheMoveOfItsBuildAlone(t *testing.T) {
-	fpOld := delivery.SourcePrefix2 + strings.Repeat("a", 64)
+	fpOld := meshcatalogclient.SourcePrefix2 + strings.Repeat("a", 64)
 	waiting, was := "sha256:"+strings.Repeat("e", 64), "sha256:"+strings.Repeat("d", 64)
 	commit := strings.Repeat("1", 40)
 	for _, c := range []struct {
@@ -907,7 +909,7 @@ func aReleasesApproveAnswersTheMoveOfItsBuildAlone(t *testing.T) {
 		alone      bool
 		at         string // the fingerprint the have runs
 		mergedAt   string // the commit the release merged web at; "" for no merge of the release
-		fpSrc      uint64 // the source revision at which web's fingerprint last changed
+		fpSrc      int64 // the source revision at which web's fingerprint last changed
 		yes, asked bool
 	}{
 		{"the build alone, its release approved", true, fpOld, commit, 7, true, false},
@@ -924,7 +926,7 @@ func aReleasesApproveAnswersTheMoveOfItsBuildAlone(t *testing.T) {
 		asksKV := &memKV{values: map[string][]byte{}}
 		p := newPasser(kvSet{buckets.Asks: asksKV}, time.Now())
 		p.logf = t.Logf
-		mod, _ := delivery.EncodeModule(delivery.Module{FP2: fpTest, Repository: "novox/web", Commit: commit, Src: 7, FPSrc: c.fpSrc, Path: delivery.RootPath})
+		mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fpTest, Repository: "novox/web", Commit: commit, Src: 7, FpSrc: c.fpSrc, Path: meshcatalogclient.RootPath})
 		p.w.put(buckets.Modules, "web", mod)
 		src, _ := delivery.EncodeSource(delivery.Source{Group: "feat/web", Heads: map[string]string{"novox/web": commit}})
 		p.w.putEntry(buckets.Source, delivery.SourceMainKey, src, 7, time.Now())
@@ -981,13 +983,13 @@ func aPlacementAloneNamesWhereModulesRun(t *testing.T) {
 // names no composition; a have waiting for a yes raises the record ask once, and the yes is written into the want and
 // kept there while the want stays at its build.
 func aPlacedNodesWantsNameTheBuildAloneAndItsYesComesFromItsHave(t *testing.T) {
-	fpOld := delivery.SourcePrefix2 + strings.Repeat("a", 64)
+	fpOld := meshcatalogclient.SourcePrefix2 + strings.Repeat("a", 64)
 	waiting, was := "sha256:"+strings.Repeat("e", 64), "sha256:"+strings.Repeat("d", 64)
 	asksKV, wantsKV := &memKV{values: map[string][]byte{}}, &memKV{values: map[string][]byte{}}
 	p := newPasser(kvSet{buckets.Asks: asksKV, buckets.Wants: wantsKV}, time.Now())
 	p.logf = t.Logf
 	put := func(bucket, key string, v []byte) { p.w.put(bucket, key, v) }
-	mod, _ := delivery.EncodeModule(delivery.Module{FP2: fpTest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: delivery.RootPath})
+	mod, _ := meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{Fp2: fpTest, Repository: "novox/web", Commit: strings.Repeat("1", 40), Path: meshcatalogclient.RootPath})
 	put(buckets.Modules, "web", mod) // the trunk's build is not done: rule 1 holds g14 at fpOld
 	placeOn(t, p.w, "g14", "web")
 	pl, _ := mmac.EncodePlacement(mma.Placement{Node: "g14", Modules: []mma.PlacedModule{{Module: "web"}}})
@@ -1106,7 +1108,7 @@ func TestAnApprovedPlacementCallsNoControllerVerb(t *testing.T) {
 // serves it, and a build whose manifest cannot be read counts what the graph says its module serves. No graph read: no wait.
 func aWantWaitsOnTheVerbEdgesTheGraphKeeps(t *testing.T) {
 	p := newPasser(kvSet{}, time.Now())
-	fp := func(c string) string { return delivery.SourcePrefix2 + strings.Repeat(c, 64) }
+	fp := func(c string) string { return meshcatalogclient.SourcePrefix2 + strings.Repeat(c, 64) }
 	if p.served(context.Background(), nil, graph.Graph{}, assign.Nodes{}) != nil {
 		t.Error("with no graph read, a want waits on a verb")
 	}
@@ -1128,7 +1130,7 @@ func aWantWaitsOnTheVerbEdgesTheGraphKeeps(t *testing.T) {
 		t.Errorf("the kept verb edges of caller = %v", got)
 	}
 	digest := strings.Repeat("d", 64)
-	man, _ := delivery.EncodeManifest(delivery.Manifest{Module: "server", JSON: `{"module":"server","claims":[{"name":"x","scope":"mesh","serves":["w"]}]}`})
+	man, _ := meshcatalogclient.EncodeManifest(meshcatalog.ManifestsByDigestValue{Module: "server", Manifest: `{"module":"server","claims":[{"name":"x","scope":"mesh","serves":["w"]}]}`})
 	get := func(_ context.Context, key string) ([]byte, error) {
 		if key == digest {
 			return man, nil
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/puts.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/puts.go
index bb5ce799..46553b58 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/puts.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/puts.go
@@ -170,7 +170,7 @@ func normalWant(w delivery.Want) delivery.Want {
 
 // putWorld is what one step of a put reads from the world.
 func (p *passer) putWorld(node, module string, put delivery.Put, manifest catalogue.Manifest, assignedHere []string) assign.PutWorld {
-	w := assign.PutWorld{Node: node, Module: module, Put: put, Now: p.clock(), Bus: catalogue.ProvidesBus(manifest), Newest: p.w.trunk()[module].FP2}
+	w := assign.PutWorld{Node: node, Module: module, Put: put, Now: p.clock(), Bus: catalogue.ProvidesBus(manifest), Newest: p.w.trunk()[module].Fp2}
 	for _, m := range assignedHere {
 		if m == module {
 			w.Assigned = true
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat.go
index 9e5b551c..487dcf9c 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"maps"
 	"mesh-delivery-assigner/internal/buckets"
 	"reflect"
@@ -453,7 +454,7 @@ func (p *passer) layAgain(ctx context.Context, prop mma.Proposal, rev uint64, cu
 func (p *passer) lays(ctx context.Context) (func(string) bool, func(string) bool) {
 	held := map[string]bool{}
 	for key := range p.w.read(buckets.Modules) {
-		if name, err := delivery.ParseModulesKey(key); err == nil {
+		if name, err := meshcatalogclient.ParseModulesKey(key); err == nil {
 			held[name] = true
 		}
 	}
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools.go
index 613a5c2a..74d44e61 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"slices"
 	"sort"
 	"strings"
@@ -103,7 +104,7 @@ func (s *seatTools) lays() (func(string) bool, func(string) bool, error) {
 	}
 	held := map[string]bool{}
 	for _, k := range mods {
-		if name, err := delivery.ParseModulesKey(k); err == nil {
+		if name, err := meshcatalogclient.ParseModulesKey(k); err == nil {
 			held[name] = true
 		}
 	}
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools_test.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools_test.go
index c6e34b3b..c5ff72f7 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools_test.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/seat_tools_test.go
@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"git.novox.be/novox/mesh-sdk/go/keys"
 	"mesh-delivery-assigner/internal/buckets"
 	"os"
@@ -195,7 +197,7 @@ func TestTheSeatsVerbs(t *testing.T) {
 	t.Run("1953/D4-D6: the seat mesh-wants' upgrade and bus", wantsVerbs)
 	t.Run("1955/L7 (ADR 0571 §6): rule 7 reads the node's own composition; an unplaced node is said", func(t *testing.T) {
 		w := newWorld()
-		fp := delivery.SourcePrefix2 + strings.Repeat("2", 64)
+		fp := meshcatalogclient.SourcePrefix2 + strings.Repeat("2", 64)
 		pl, _ := mmac.EncodePlacement(mma.Placement{V: keys.Version, Node: "ace", Modules: []mma.PlacedModule{{Module: "web"}}})
 		pkey, _ := mmac.LegacyKey("ace")
 		w.putEntry(plc.PlacementBucket, pkey, pl, 1, time.Now())
@@ -373,7 +375,7 @@ func TestTheSeatsVerbs(t *testing.T) {
 // written with who and why, recorded as a hand act in the seat's log and said as policy-changed, and default takes it back;
 // the bus is refused; compare lists each node's composition and the findings; bus names the node behind the indexer's newest.
 func wantsVerbs(t *testing.T) {
-	fpOld, fpNew := delivery.SourcePrefix2+strings.Repeat("1", 64), delivery.SourcePrefix2+strings.Repeat("2", 64)
+	fpOld, fpNew := meshcatalogclient.SourcePrefix2+strings.Repeat("1", 64), meshcatalogclient.SourcePrefix2+strings.Repeat("2", 64)
 	st := memStore{}
 	for _, state := range []string{modulesState, manifestsState, policiesState, haveState, putsState, "findings", buckets.ComposedRead} {
 		st[state] = &memKV{values: map[string][]byte{}}
@@ -387,9 +389,9 @@ func wantsVerbs(t *testing.T) {
 	st[buckets.ComposedRead].values[refusedKey], _ = delivery.EncodeComposed(delivery.Composed{Node: "laptop", Module: "web", FP: fpNew, Refused: "a required value is unset"})
 	manifest := func(name, extra string) {
 		raw := `{"module":"` + name + `","version":"1"` + extra + `}`
-		digest := delivery.ManifestDigest([]byte(raw))
-		st[manifestsState].values[digest], _ = delivery.EncodeManifest(delivery.Manifest{V: keys.Version, Module: name, JSON: raw})
-		st[modulesState].values[name], _ = delivery.EncodeModule(delivery.Module{V: keys.Version, FP2: fpNew, Manifest: digest, Repository: "novox/x", Commit: "c"})
+		digest := meshcatalogclient.ManifestDigest([]byte(raw))
+		st[manifestsState].values[digest], _ = meshcatalogclient.EncodeManifest(meshcatalog.ManifestsByDigestValue{V: keys.Version, Module: name, Manifest: raw})
+		st[modulesState].values[name], _ = meshcatalogclient.EncodeModule(meshcatalog.ModulesByModuleValue{V: keys.Version, Fp2: fpNew, Manifest: digest, Repository: "novox/x", Commit: "c"})
 	}
 	manifest("web", "")
 	manifest("photos", `,"upgrade":{"policy":"record","why":"a person checks the albums"}`)
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/tools.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/tools.go
index 59cab6a3..9aa373cf 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/tools.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/tools.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"os"
 	"regexp"
 	"slices"
@@ -81,18 +82,18 @@ func (s *putTools) version(module, version string) (string, error) {
 		if !found {
 			return "", fmt.Errorf("the indexer holds no module %s at the trunk", module)
 		}
-		m, err := delivery.DecodeModule(raw)
+		m, err := meshcatalogclient.DecodeModule(raw)
 		if err != nil {
 			return "", fmt.Errorf("the indexer's %s cannot be read: %w", module, err)
 		}
-		if m.FP2 == "" {
+		if m.Fp2 == "" {
 			return "", fmt.Errorf("the indexer holds no fingerprint of the new form for %s: %s", module, m.None2)
 		}
-		return m.FP2, nil
+		return m.Fp2, nil
 	case fullFP.MatchString(v):
 		return v, nil
 	case prefix.MatchString(v):
-		start := strings.TrimPrefix(v, delivery.SourcePrefix2)
+		start := strings.TrimPrefix(v, meshcatalogclient.SourcePrefix2)
 		keys, err := s.st.keys(delivery.BuilderModule + ".builds")
 		if err != nil {
 			return "", fmt.Errorf("the builder's builds cannot be listed: %w", err)
@@ -100,7 +101,7 @@ func (s *putTools) version(module, version string) (string, error) {
 		var found []string
 		for _, k := range keys {
 			m, fp, err := delivery.ParseBuilderBuildKey(k)
-			if err == nil && m == module && strings.HasPrefix(strings.TrimPrefix(fp, delivery.SourcePrefix2), start) {
+			if err == nil && m == module && strings.HasPrefix(strings.TrimPrefix(fp, meshcatalogclient.SourcePrefix2), start) {
 				found = append(found, fp)
 			}
 		}
@@ -371,7 +372,7 @@ func serveTools() error {
 
 // shortFP is a fingerprint's first twelve hex digits.
 func shortFP(fp string) string {
-	part, err := delivery.FingerprintKeyPart(fp)
+	part, err := meshcatalogclient.KeyPart(fp)
 	if err != nil || len(part) < 12 {
 		return fp
 	}
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/wants_tools.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/wants_tools.go
index 3886f495..d622a712 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/wants_tools.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/wants_tools.go
@@ -7,6 +7,8 @@ import (
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	meshhandacts "git.novox.be/novox/mesh-contracts/health-and-repair/go/seats/meshhandacts"
 	"git.novox.be/novox/mesh-contracts/placement/go/seats/meshwants"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"mesh-delivery-assigner/internal/buckets"
 	"sort"
 	"strconv"
@@ -96,14 +98,14 @@ func (s *wantsTools) manifest(digest string) ([]byte, bool, error) {
 }
 
 // manifests is every module the indexer holds, with its trunk manifest and fingerprint.
-func (s *wantsTools) manifests() (map[string]catalogue.Manifest, map[string]delivery.Module, error) {
+func (s *wantsTools) manifests() (map[string]catalogue.Manifest, map[string]meshcatalog.ModulesByModuleValue, error) {
 	mods, err := s.values(modulesState)
 	if err != nil {
 		return nil, nil, err
 	}
-	out, held := map[string]catalogue.Manifest{}, map[string]delivery.Module{}
+	out, held := map[string]catalogue.Manifest{}, map[string]meshcatalog.ModulesByModuleValue{}
 	for name, raw := range mods {
-		m, err := delivery.DecodeModule(raw)
+		m, err := meshcatalogclient.DecodeModule(raw)
 		if err != nil {
 			continue
 		}
@@ -115,12 +117,12 @@ func (s *wantsTools) manifests() (map[string]catalogue.Manifest, map[string]deli
 		if err != nil || !found {
 			continue
 		}
-		kept, err := delivery.DecodeManifest(mraw)
+		kept, err := meshcatalogclient.DecodeManifest(mraw)
 		if err != nil {
 			continue
 		}
 		// Decoded, never judged (ADR 0578 §3); one that does not decode is left out of the answer, as before.
-		if man, err := catalogue.Decode([]byte(kept.JSON)); err == nil {
+		if man, err := catalogue.Decode([]byte(kept.Manifest)); err == nil {
 			out[name] = man
 		}
 	}
@@ -270,7 +272,7 @@ func (s *wantsTools) doBus(map[string]any) (any, error) {
 	if bus == "" {
 		return nil, errors.New("the indexer holds no module that provides the bus")
 	}
-	newest := held[bus].FP2
+	newest := held[bus].Fp2
 	haves, err := s.values(haveState)
 	if err != nil {
 		return nil, err
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world.go
index 095a1dd3..7e7ef6b7 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world.go
@@ -5,6 +5,8 @@ import (
 	"errors"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"git.novox.be/novox/mesh-sdk/go/keys"
 	"maps"
 	"mesh-delivery-assigner/internal/buckets"
@@ -96,11 +98,11 @@ func (w *world) putEntry(bucket, key string, value []byte, revision uint64, at t
 // unknown: none, and the move is asked of a person.
 func (w *world) release(module, fp string) (string, bool) {
 	t, ok := w.trunk()[module]
-	if !ok || fp == "" || t.FP2 != fp || t.FPSrc == 0 || t.Commit == "" {
+	if !ok || fp == "" || t.Fp2 != fp || t.FpSrc == 0 || t.Commit == "" {
 		return "", false
 	}
 	w.mu.Lock()
-	group := w.sourceGroups[t.FPSrc]
+	group := w.sourceGroups[uint64(t.FpSrc)]
 	w.mu.Unlock()
 	key, err := delivery.MergesKey(group)
 	if group == "" || err != nil {
@@ -226,7 +228,7 @@ func (w *world) manifest(ctx context.Context, get getter, digest string) parsed
 	if ok {
 		return p
 	}
-	key, err := delivery.ManifestsKey(digest)
+	key, err := meshcatalogclient.ManifestsKey(digest)
 	if err != nil {
 		return parsed{err: err.Error()}
 	}
@@ -237,10 +239,10 @@ func (w *world) manifest(ctx context.Context, get getter, digest string) parsed
 	if err != nil {
 		return parsed{err: err.Error()}
 	}
-	m, err := delivery.DecodeManifest(value)
+	m, err := meshcatalogclient.DecodeManifest(value)
 	if err != nil {
 		p = parsed{err: err.Error()}
-	} else if man, err := catalogue.Decode([]byte(m.JSON)); err != nil {
+	} else if man, err := catalogue.Decode([]byte(m.Manifest)); err != nil {
 		// Decoded, never judged (novox/hq ADR 0578 §3): the indexer's judge judged it, and its verdict is taken from the
 		// module's value where it is read (world.mesh).
 		p = parsed{module: m.Module, err: "it does not decode: " + err.Error()}
@@ -292,14 +294,14 @@ func (w *world) placedNodes() map[string]bool {
 }
 
 // trunk is every module the indexer holds at the trunk, with its value.
-func (w *world) trunk() map[string]delivery.Module {
-	out := map[string]delivery.Module{}
+func (w *world) trunk() map[string]meshcatalog.ModulesByModuleValue {
+	out := map[string]meshcatalog.ModulesByModuleValue{}
 	for key, value := range w.read(buckets.Modules) {
-		name, err := delivery.ParseModulesKey(key)
+		name, err := meshcatalogclient.ParseModulesKey(key)
 		if err != nil {
 			continue
 		}
-		if m, err := delivery.DecodeModule(value); err == nil {
+		if m, err := meshcatalogclient.DecodeModule(value); err == nil {
 			out[name] = m
 		}
 	}
diff --git a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world_test.go b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world_test.go
index 64c4e0f8..358ebe41 100644
--- a/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world_test.go
+++ b/modules/mesh-delivery-assigner/cmd/mesh-delivery-assigner/world_test.go
@@ -2,6 +2,8 @@ package main
 
 import (
 	"context"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
+	"git.novox.be/novox/mesh-delivery/contracts/go/seats/meshcatalog"
 	"mesh-delivery-assigner/internal/buckets"
 	"slices"
 	"strings"
@@ -16,8 +18,8 @@ type fakeManifests map[string][]byte
 
 func (f fakeManifests) add(t *testing.T, module, body string) string {
 	t.Helper()
-	digest := delivery.ManifestDigest([]byte(body))
-	value, err := delivery.EncodeManifest(delivery.Manifest{Module: module, JSON: body})
+	digest := meshcatalogclient.ManifestDigest([]byte(body))
+	value, err := meshcatalogclient.EncodeManifest(meshcatalog.ManifestsByDigestValue{Module: module, Manifest: body})
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -32,7 +34,7 @@ func (f fakeManifests) get(_ context.Context, key string) ([]byte, error) {
 	return nil, errNotThere
 }
 
-func fp(c byte) string { return delivery.SourcePrefix2 + strings.Repeat(string(c), 64) }
+func fp(c byte) string { return meshcatalogclient.SourcePrefix2 + strings.Repeat(string(c), 64) }
 
 func pull(repo string, number int, modules map[string]delivery.CandidateModule) delivery.CandidatePull {
 	p := delivery.CandidatePull{Head: delivery.Head{Repository: repo, Number: number, Head: strings.Repeat("3", 40)}, Fps: modules}
@@ -56,7 +58,7 @@ func theWorldCountsTheValuesAKeyTakes(t *testing.T) {
 		t.Errorf("changed = %d for a key never seen", got)
 	}
 	// ADR 0571 clause 9: grants are read from the grants part's bucket, the one bucket of grants (ADR 0590).
-	fp := delivery.SourcePrefix2 + strings.Repeat("d", 64)
+	fp := meshcatalogclient.SourcePrefix2 + strings.Repeat("d", 64)
 	gkey, _ := delivery.PartGrantKey("web", fp)
 	grant, _ := delivery.EncodeGrant(delivery.Grant{Accounts: []string{"ace.web"}})
 	for _, row := range []struct {
diff --git a/modules/mesh-delivery-assigner/internal/assign/asks.go b/modules/mesh-delivery-assigner/internal/assign/asks.go
index 203a7529..34a0493d 100644
--- a/modules/mesh-delivery-assigner/internal/assign/asks.go
+++ b/modules/mesh-delivery-assigner/internal/assign/asks.go
@@ -2,6 +2,7 @@ package assign
 
 import (
 	"fmt"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"regexp"
 	"strings"
 	"time"
@@ -64,7 +65,7 @@ func RestoreAsk(key, node, module, fp, words string, now time.Time) delivery.Ass
 // words, under the assigner's own name (ADR 0437 clause 9), keyed by the held fingerprint. needsYou is true for a module holding
 // data, whose restore ask waits for the operator.
 func HeldCondition(module, fp, node, words string, raised, needsYou bool) oc.Condition {
-	key := delivery.AssignerModule + ".held." + module + "." + strings.TrimPrefix(fp, delivery.SourcePrefix2)
+	key := delivery.AssignerModule + ".held." + module + "." + strings.TrimPrefix(fp, meshcatalogclient.SourcePrefix2)
 	subject := oc.ConditionSubject{Scope: "module", ID: module, Machine: node}
 	if !raised {
 		return oc.Condition{Key: key, Subject: subject, State: occ.StateCleared}
@@ -232,7 +233,7 @@ func BackupAsk(key, node, module, fp, digest, words string, asking int, now time
 // BackupCondition is the condition raised when a backup before an apply fails and the module is held on the node (ADR 0539 §16),
 // naming the node, the module and the backup's words; cleared under the same key.
 func BackupCondition(node, module, fp, words string, raised bool) oc.Condition {
-	key := delivery.AssignerModule + ".backup." + node + "." + module + "." + strings.TrimPrefix(fp, delivery.SourcePrefix2)
+	key := delivery.AssignerModule + ".backup." + node + "." + module + "." + strings.TrimPrefix(fp, meshcatalogclient.SourcePrefix2)
 	subject := oc.ConditionSubject{Scope: "module", ID: module, Machine: node}
 	if !raised {
 		return oc.Condition{Key: key, Subject: subject, State: occ.StateCleared}
diff --git a/modules/mesh-delivery-assigner/internal/assign/asks_test.go b/modules/mesh-delivery-assigner/internal/assign/asks_test.go
index 2009f35b..0028497b 100644
--- a/modules/mesh-delivery-assigner/internal/assign/asks_test.go
+++ b/modules/mesh-delivery-assigner/internal/assign/asks_test.go
@@ -2,6 +2,7 @@ package assign
 
 import (
 	"fmt"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"slices"
 	"strings"
 	"testing"
@@ -137,11 +138,11 @@ func saidConditionsAreFindings(t *testing.T) {
 		raised, cleared oc.Condition
 		key             string
 	}{
-		{HeldCondition("mail", fNew, "ace", "refused", true, true), LiftedCondition("mail", fNew), "module.mail." + strings.TrimPrefix(fNew, delivery.SourcePrefix2) + ".held"},
+		{HeldCondition("mail", fNew, "ace", "refused", true, true), LiftedCondition("mail", fNew), "module.mail." + strings.TrimPrefix(fNew, meshcatalogclient.SourcePrefix2) + ".held"},
 		{NodeFailedCondition("ace", "mail", fNew, NodeFailure{Words: "x", Others: []string{"g14"}}, true), NodeFailedCondition("ace", "mail", fNew, NodeFailure{}, false), "module.ace.mail.failed-alone"},
 		{NeitherCondition("ace", "mail", Holding{Rule: 3, Words: "w"}, true), NeitherCondition("ace", "mail", Holding{}, false), "module.ace.mail.neither"},
 		{SeatWaitsCondition([]string{"placement"}), SeatWaitsCondition(nil), "module.mesh-delivery-assigner.seat-states"},
-		{BackupCondition("ace", "mail", fNew, "disk full", true), BackupCondition("ace", "mail", fNew, "", false), "module.ace.mail." + strings.TrimPrefix(fNew, delivery.SourcePrefix2) + ".backup"},
+		{BackupCondition("ace", "mail", fNew, "disk full", true), BackupCondition("ace", "mail", fNew, "", false), "module.ace.mail." + strings.TrimPrefix(fNew, meshcatalogclient.SourcePrefix2) + ".backup"},
 	} {
 		puts, deletes, said := map[string]health.Finding{}, []string{}, 0
 		f := Findings{Put: func(k string, v []byte) error {
diff --git a/modules/mesh-delivery-assigner/internal/assign/wants.go b/modules/mesh-delivery-assigner/internal/assign/wants.go
index bba9b9c2..ebf8d2d9 100644
--- a/modules/mesh-delivery-assigner/internal/assign/wants.go
+++ b/modules/mesh-delivery-assigner/internal/assign/wants.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"maps"
 	"slices"
 	"sort"
@@ -452,12 +453,12 @@ func Wants(m Module, n Nodes, wants map[string]delivery.Want, lastHealthy map[st
 			// A node that runs an old-form build, which no want can name, stays under the canary (issue 1945, a design limit):
 			// its first want names F once the canary runs F healthy. Any other node that runs it (F itself, or an older
 			// fingerprint with no composition or grant) gets F by the rules without which there is nothing to want.
-			older := ran && runs(have) && have.Fp != m.FP && strings.HasPrefix(have.Fp, delivery.SourcePrefix2)
+			older := ran && runs(have) && have.Fp != m.FP && strings.HasPrefix(have.Fp, meshcatalogclient.SourcePrefix2)
 			if older {
 				_, composed := m.composition(node, have.Fp)
 				older = composed && m.GrantedAt != nil && m.GrantedAt(have.Fp)
 			}
-			oldForm := ran && runs(have) && have.Fp != m.FP && !strings.HasPrefix(have.Fp, delivery.SourcePrefix2)
+			oldForm := ran && runs(have) && have.Fp != m.FP && !strings.HasPrefix(have.Fp, meshcatalogclient.SourcePrefix2)
 			switch {
 			case older:
 				ok, target = true, have.Fp
@@ -722,7 +723,7 @@ func normal(w delivery.Want) delivery.Want {
 }
 
 func short(fp string) string {
-	part, err := delivery.FingerprintKeyPart(fp)
+	part, err := meshcatalogclient.KeyPart(fp)
 	if err != nil || len(part) < 12 {
 		return fp
 	}
diff --git a/modules/mesh-delivery-assigner/internal/assign/wants_test.go b/modules/mesh-delivery-assigner/internal/assign/wants_test.go
index ddbd3938..ac771dc2 100644
--- a/modules/mesh-delivery-assigner/internal/assign/wants_test.go
+++ b/modules/mesh-delivery-assigner/internal/assign/wants_test.go
@@ -3,6 +3,7 @@ package assign
 import (
 	"git.novox.be/novox/mesh-contracts/go/clients/nodeengineclient"
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
+	"git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient"
 	"slices"
 	"strings"
 	"testing"
@@ -15,7 +16,7 @@ import (
 	"git.novox.be/novox/mesh-delivery/sdk/graph"
 )
 
-func fpOf(c byte) string { return delivery.SourcePrefix2 + strings.Repeat(string(c), 64) }
+func fpOf(c byte) string { return meshcatalogclient.SourcePrefix2 + strings.Repeat(string(c), 64) }
 
 var (
 	fNew = fpOf('b')