update

dist/js/nostr/decryptionSchemeCache.js

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+// js/nostr/decryptionSchemeCache.js
+
+/**
+ * Shared decryption scheme cache across all list services (blocks,
+ * subscriptions, hashtag preferences). When one service discovers the
+ * correct decryption scheme for a pubkey, the others can reuse it
+ * immediately instead of independently probing the NIP-07 extension.
+ *
+ * This eliminates redundant extension decrypt calls during the critical
+ * login path where all three services decrypt simultaneously.
+ */
+
+// Extended from 10 minutes to 2 hours. The cache is cleared on logout, so
+// there's no privacy concern with a longer TTL. A short TTL caused redundant
+// scheme probing during normal browsing sessions, triggering unnecessary
+// NIP-07 extension calls that slow down background list re-syncs.
+const DECRYPTION_CACHE_TTL_MS = 2 * 60 * 60 * 1000; // 2 hours
+
+/** @type {Map<string, { scheme: string, timestamp: number }>} */
+const cache = new Map();
+
+/**
+ * Retrieve the last successfully-used decryption scheme for a pubkey.
+ * Returns null if the entry is missing or expired.
+ *
+ * @param {string} pubkey - Hex pubkey to look up.
+ * @returns {string|null} The scheme identifier (e.g. "nip44_v2") or null.
+ */
+export function getLastSuccessfulScheme(pubkey) {
+  if (typeof pubkey !== "string" || !pubkey) {
+    return null;
+  }
+
+  const entry = cache.get(pubkey);
+  if (!entry) {
+    return null;
+  }
+
+  if (Date.now() - entry.timestamp > DECRYPTION_CACHE_TTL_MS) {
+    cache.delete(pubkey);
+    return null;
+  }
+
+  return entry.scheme;
+}
+
+/**
+ * Record a successful decryption scheme for a pubkey so other services
+ * can skip scheme discovery.
+ *
+ * @param {string} pubkey - Hex pubkey.
+ * @param {string} scheme - The scheme that succeeded (e.g. "nip44_v2").
+ */
+export function setLastSuccessfulScheme(pubkey, scheme) {
+  if (typeof pubkey !== "string" || !pubkey) {
+    return;
+  }
+  if (typeof scheme !== "string" || !scheme) {
+    return;
+  }
+
+  cache.set(pubkey, { scheme, timestamp: Date.now() });
+}
+
+/**
+ * Clear all cached entries. Useful on logout.
+ */
+export function clearDecryptionSchemeCache() {
+  cache.clear();
+}