diff --git a/modules/mesh-grants/internal/buscompose/ledger.go b/modules/mesh-grants/internal/buscompose/ledger.go
index e6f66ed3..c34119e4 100644
--- a/modules/mesh-grants/internal/buscompose/ledger.go
+++ b/modules/mesh-grants/internal/buscompose/ledger.go
@@ -5,6 +5,8 @@ import (
 	"slices"
 	"sort"
 	"strings"
+
+	sdk "git.novox.be/novox/mesh-sdk/go/buscompose"
 )
 
 // A module's ledger and the one account that writes it (issue 1966 D5; novox/hq ADR 0597 §9, design 25 § 12.4).
@@ -12,27 +14,16 @@ import (
 // **Only the tool runner's ledger credential publishes on a ledger's history** (ADR 0597 §9): one per module assignment,
 // named ledger.<machine>.<module> (KindLedger), scoped to the subjects of that module's ledger histories and snapshots, and
 // gone when the module is unassigned from the machine. The module's own account, its processes and the machine's tool
-// runner hold no publish there, so a raw publish on a history is refused by the bus. The subjects are `mesh.ledger.<module>.
-// <local name>.history.<instance>` and `mesh.ledger.<module>.<local name>.snapshot.<instance>`, one subject per instance
-// (design 25 § 12.4); the bus module that creates the ledger's history stream (B2) takes them from here.
-
-// LedgerHistorySubject is the subject a ledger's history is on, without the instance: an operation on instance I is on
-// `<LedgerHistorySubject>.<I>`.
-func LedgerHistorySubject(module, local string) string {
-	return "mesh.ledger." + module + "." + local + ".history"
-}
-
-// LedgerSnapshotSubject is the subject a ledger's instances' snapshots are on, without the instance.
-func LedgerSnapshotSubject(module, local string) string {
-	return "mesh.ledger." + module + "." + local + ".snapshot"
-}
+// runner hold no publish there, so a raw publish on a history is refused by the bus. The subjects are named in one place, mesh-sdk's
+// buscompose (LedgerHistorySubject, LedgerSnapshotSubject), `mesh.ledger.<module>.<local name>.history|snapshot` and
+// one subject per instance below it (design 25 § 12.4).
 
 // LedgerPublishGrants are the publish patterns a module's ledger account is granted: the histories and the snapshots of the
 // ledgers named, every instance of each, and nothing else. Sorted.
 func LedgerPublishGrants(module string, locals []string) []string {
 	var out []string
 	for _, local := range locals {
-		out = append(out, LedgerHistorySubject(module, local)+".>", LedgerSnapshotSubject(module, local)+".>")
+		out = append(out, sdk.LedgerHistorySubject(module, local)+".>", sdk.LedgerSnapshotSubject(module, local)+".>")
 	}
 	sort.Strings(out)
 	return out