diff --git a/sanctuary/build.gradle b/sanctuary/build.gradle
index f5056b2..e78b420 100644
--- a/sanctuary/build.gradle
+++ b/sanctuary/build.gradle
@@ -244,7 +244,9 @@ tasks.register("verifyBlackMarket") {
 			|| !quests.contains("SanctuaryRegistries.questBoardTier")
 			|| quests.contains("activationTier(")
 			|| quests.contains("QuestBoardTier.ACTIVATION_COST")
-			|| !quests.contains("addTreasury(claim.depositCurrency(), claim.depositAmount())")) {
+			|| !quests.contains("addTreasury(claim.depositCurrency(), claim.depositAmount())")
+			|| !quests.contains("shouldRewriteSign")
+			|| !quests.contains("syncLoadedSigns")) {
 			throw new GradleException("The physical Black Market escrow/delivery contract is incomplete")
 		}
 	}
diff --git a/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardGenerator.java b/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardGenerator.java
index 3090e05..37d557f 100644
--- a/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardGenerator.java
+++ b/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardGenerator.java
@@ -75,9 +75,12 @@ final class QuestBoardGenerator {
 	private QuestBoardGenerator() {}
 
 	static QuestBoardData.Contract generate(MinecraftServer server, String boardId, QuestBoardTier tier, long now) {
-		long day = Math.floorDiv(now, 86_400_000L);
-		long seed = boardId.hashCode() * 0x9E3779B97F4A7C15L ^ day * 0xD1B54A32D192ED03L ^ tier.ordinal();
-		RandomSource random = RandomSource.create(seed);
+		return generate(server, boardId, tier, now, Math.floorDiv(now, 86_400_000L));
+	}
+
+	static QuestBoardData.Contract generate(MinecraftServer server, String boardId, QuestBoardTier tier,
+		long now, long salt) {
+		RandomSource random = RandomSource.create(contractSeed(boardId, tier, salt));
 		List<Template> pool = switch (tier) {
 			case EMERALD -> EASY;
 			case RUBY -> MEDIUM;
@@ -93,6 +96,10 @@ final class QuestBoardGenerator {
 			java.util.Optional.empty(), now);
 	}
 
+	static long contractSeed(String boardId, QuestBoardTier tier, long salt) {
+		return boardId.hashCode() * 0x9E3779B97F4A7C15L ^ salt * 0xD1B54A32D192ED03L ^ tier.ordinal();
+	}
+
 	static long nextRefreshAt(String boardId, long now) {
 		LocalDate tomorrow = Instant.ofEpochMilli(now).atZone(ZoneOffset.UTC).toLocalDate().plusDays(1);
 		long midnight = tomorrow.atStartOfDay(ZoneOffset.UTC).toInstant().toEpochMilli();
diff --git a/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardService.java b/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardService.java
index 62cecaa..d56fbab 100644
--- a/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardService.java
+++ b/sanctuary/src/main/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardService.java
@@ -262,17 +262,17 @@ public final class QuestBoardService {
 	}
 
 	private static void tick(MinecraftServer server) {
+		QuestBoardData data = QuestBoardData.get(server);
+		syncLoadedSigns(server, data);
 		if (++tickCounter < 20) return;
 		tickCounter = 0;
 		long now = System.currentTimeMillis();
-		QuestBoardData data = QuestBoardData.get(server);
 		for (QuestBoardData.Board board : data.boards()) {
 			ServerLevel level = level(server, board.dimension());
 			BlockPos pos = BlockPos.of(board.pos());
 			if (level != null && level.isLoaded(pos) && !(level.getBlockEntity(pos) instanceof SignBlockEntity)) {
 				removeBoard(server, data, board, "server", "sign_missing", true); continue;
 			}
-			if (level != null && level.isLoaded(pos) && refreshedSignLayouts.add(board.id())) refreshSign(server, board);
 			QuestBoardData.Contract contract = board.contract().orElse(null);
 			if (contract != null && contract.claim().isPresent() && now >= contract.claim().get().deadlineAt()) {
 				QuestBoardData.Claim claim = contract.claim().get();
@@ -288,18 +288,41 @@ public final class QuestBoardService {
 			}
 			if (!board.frozen() && now >= board.nextRefreshAt()
 				&& (contract == null || contract.claim().isEmpty())) {
-				QuestBoardData.Contract generated = QuestBoardGenerator.generate(server, board.id(), board.questTier(), now);
-				QuestBoardData.Board refreshed = board.withContract(Optional.of(generated),
-					QuestBoardGenerator.nextRefreshAt(board.id(), now));
+				QuestBoardData.Board latest = data.board(board.id()).orElse(null);
+				if (latest == null || latest.frozen()
+					|| latest.contract().flatMap(QuestBoardData.Contract::claim).isPresent()) continue;
+				QuestBoardData.Contract generated = QuestBoardGenerator.generate(server, board.id(), latest.questTier(), now);
+				QuestBoardData.Board refreshed = latest.withContract(Optional.of(generated),
+					QuestBoardGenerator.nextRefreshAt(latest.id(), now));
 				data.replace(refreshed);
-				data.audit(new QuestBoardData.AuditEntry(now, "refresh", "server", board.id(), generated.id(), "daily"));
+				data.audit(new QuestBoardData.AuditEntry(now, "refresh", "server", latest.id(), generated.id(), "daily"));
 				refreshSign(server, refreshed);
 			}
 		}
 	}
 
+	private static void syncLoadedSigns(MinecraftServer server, QuestBoardData data) {
+		for (QuestBoardData.Board board : data.boards()) {
+			ServerLevel level = level(server, board.dimension());
+			BlockPos pos = BlockPos.of(board.pos());
+			boolean loaded = level != null && level.isLoaded(pos);
+			if (!shouldRewriteSign(refreshedSignLayouts, board.id(), loaded)) continue;
+			refreshSign(server, board);
+		}
+	}
+
+	/** A loaded board whose layout was forgotten (chunk unload or failed write) must be rewritten. */
+	static boolean shouldRewriteSign(Set<String> syncedLayouts, String boardId, boolean chunkLoaded) {
+		if (!chunkLoaded) {
+			syncedLayouts.remove(boardId);
+			return false;
+		}
+		return syncedLayouts.add(boardId);
+	}
+
 	private static void removeBoard(MinecraftServer server, QuestBoardData data, QuestBoardData.Board board,
 		String actor, String reason, boolean refundDeposit) {
+		refreshedSignLayouts.remove(board.id());
 		if (!data.remove(board)) return;
 		long now = System.currentTimeMillis();
 		board.contract().flatMap(QuestBoardData.Contract::claim).ifPresent(claim -> {
@@ -330,7 +353,8 @@ public final class QuestBoardService {
 		QuestBoardData.Board board = resolve(data, id);
 		if (board == null || board.contract().flatMap(QuestBoardData.Contract::claim).isPresent()) return false;
 		long now = System.currentTimeMillis();
-		QuestBoardData.Contract contract = QuestBoardGenerator.generate(server, board.id(), board.questTier(), now);
+		QuestBoardData.Contract contract = QuestBoardGenerator.generate(server, board.id(), board.questTier(), now,
+			now ^ UUID.randomUUID().getMostSignificantBits());
 		QuestBoardData.Board updated = board.withContract(Optional.of(contract), QuestBoardGenerator.nextRefreshAt(board.id(), now));
 		data.replace(updated);
 		data.audit(new QuestBoardData.AuditEntry(now, "operator_refresh", actor, board.id(), contract.id(), ""));
@@ -338,11 +362,15 @@ public final class QuestBoardService {
 		return true;
 	}
 
-	static void refreshSign(MinecraftServer server, QuestBoardData.Board board) {
+	static boolean refreshSign(MinecraftServer server, QuestBoardData.Board board) {
 		ServerLevel level = level(server, board.dimension());
 		BlockPos pos = BlockPos.of(board.pos());
-		if (level != null && level.isLoaded(pos) && level.getBlockEntity(pos) instanceof SignBlockEntity sign)
+		if (level != null && level.isLoaded(pos) && level.getBlockEntity(pos) instanceof SignBlockEntity sign) {
 			writeSign(level, sign, board);
+			return true;
+		}
+		refreshedSignLayouts.remove(board.id());
+		return false;
 	}
 
 	private static void writeSign(ServerLevel level, SignBlockEntity sign, QuestBoardData.Board board) {
@@ -370,6 +398,7 @@ public final class QuestBoardService {
 		sign.setWaxed(true);
 		sign.setChanged();
 		level.sendBlockUpdated(sign.getBlockPos(), sign.getBlockState(), sign.getBlockState(), 3);
+		refreshedSignLayouts.add(board.id());
 	}
 
 	private static void inspect(ServerPlayer player, QuestBoardData.Board board) {
diff --git a/sanctuary/src/test/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardModelSmoke.java b/sanctuary/src/test/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardModelSmoke.java
index 7c701e0..5e1ae91 100644
--- a/sanctuary/src/test/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardModelSmoke.java
+++ b/sanctuary/src/test/java/fr/koka99cab/sanctuary26/sanctuary/shop/QuestBoardModelSmoke.java
@@ -1,6 +1,8 @@
 package fr.koka99cab.sanctuary26.sanctuary.shop;
 
+import java.util.HashSet;
 import java.util.Optional;
+import java.util.Set;
 import java.util.UUID;
 import net.minecraft.world.item.ItemStack;
 
@@ -39,6 +41,25 @@ public final class QuestBoardModelSmoke {
 		long refresh = QuestBoardGenerator.nextRefreshAt("board", now);
 		require(refresh > now && refresh - now < 28L * 60L * 60L * 1_000L,
 			"Daily refresh escaped its UTC window");
+		long day = Math.floorDiv(now, 86_400_000L);
+		require(QuestBoardGenerator.contractSeed("board", QuestBoardTier.RUBY, day)
+				== QuestBoardGenerator.contractSeed("board", QuestBoardTier.RUBY, day),
+			"Daily contracts on the same UTC day must stay deterministic");
+		require(QuestBoardGenerator.contractSeed("board", QuestBoardTier.RUBY, day)
+				!= QuestBoardGenerator.contractSeed("board", QuestBoardTier.RUBY, now),
+			"An operator refresh must not reuse the daily seed");
+		Set<String> layouts = new HashSet<>();
+		require(!QuestBoardService.shouldRewriteSign(layouts, "board", false),
+			"An unloaded board must not rewrite its sign");
+		require(layouts.isEmpty(), "Unloading must forget the cached sign layout");
+		require(QuestBoardService.shouldRewriteSign(layouts, "board", true),
+			"The first load after a rotation must rewrite the sign from saved data");
+		require(!QuestBoardService.shouldRewriteSign(layouts, "board", true),
+			"A still-loaded board must not rewrite its sign every tick");
+		require(!QuestBoardService.shouldRewriteSign(layouts, "board", false),
+			"Leaving the chunk must forget the layout without rewriting");
+		require(QuestBoardService.shouldRewriteSign(layouts, "board", true),
+			"Returning after an unloaded daily refresh must rewrite the new contract");
 	}
 
 	private static void require(boolean value, String message) {