diff --git a/lib/index.js b/lib/index.js
index b4b4afa..12ff695 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -454,9 +454,12 @@ function initSet(peer, config) {
     const tangle = peer.db.getTangle(tangleID)
 
     // prettier-ignore
-    if (!tangle || tangle.size === 0) throw new Error(`isGhostable() tangleID "${tangleID}" is empty`)
+    if (!tangle || tangle.size === 0) throw new Error(`Tangle "${tangleID}" is locally unknown`)
     // prettier-ignore
-    if (!isValidSetMoot(tangle.root)) throw new Error(`minRequiredDepth() "${tangleID}" is not a Set moot`)
+    if (!MsgV3.isMoot(tangle.root)) throw new Error(`Tangle "${tangleID}" is not a moot`)
+    const domain = tangle.root.metadata.domain
+    // prettier-ignore
+    if (!domain.startsWith(PREFIX)) throw new Error(`Tangle "${tangleID}" is not a Set moot`)
 
     // Discover item roots
     const itemRoots = new Set()