diff --git a/src/adapters/keypair.ts b/src/adapters/keypair.ts
index b108630..5b60c70 100644
--- a/src/adapters/keypair.ts
+++ b/src/adapters/keypair.ts
@@ -28,6 +28,17 @@ export class KeypairWalletAdapter implements WalletAdapter {
       return parsedTx.toXDR();
     }
 
+    if (
+      _opts?.networkPassphrase &&
+      tx.networkPassphrase !== undefined &&
+      tx.networkPassphrase !== _opts.networkPassphrase
+    ) {
+      throw new Error(
+        `networkPassphrase mismatch: the transaction was built for "${tx.networkPassphrase}" ` +
+          `but opts.networkPassphrase is "${_opts.networkPassphrase}".`,
+      );
+    }
+
     tx.sign(this.keypair);
     return tx;
   }
diff --git a/src/dashboard/transaction-history.ts b/src/dashboard/transaction-history.ts
index 991b943..e27ef9c 100644
--- a/src/dashboard/transaction-history.ts
+++ b/src/dashboard/transaction-history.ts
@@ -213,7 +213,21 @@ function toIso8601(value: string): string {
 function asTimestamp(value: unknown): number {
   if (typeof value === 'number' && Number.isFinite(value)) {
     // Indexers emit seconds for `createdAt`; normalise to milliseconds.
-    return value < 1e12 ? Math.trunc(value) * 1000 : Math.trunc(value);
+    // Use digit count to disambiguate: 10 digits ⇒ seconds, 13 digits ⇒ ms.
+    // This avoids the pre-2001 ms misclassification of the old < 1e12 check.
+    const abs = Math.abs(value);
+    if (abs >= 1e9 && abs < 1e10) {
+      // 10 digits: seconds epoch (1970–2033 range)
+      return Math.trunc(value) * 1000;
+    }
+    if (abs >= 1e12 && abs < 1e13) {
+      // 13 digits: milliseconds epoch
+      return Math.trunc(value);
+    }
+    // Ambiguous digit count (e.g. 11-12 digits): fall through to existing
+    // callers — they already handle numeric timestamps in a context-dependent
+    // way, and the ambiguous band is small relative to the pre-2001 breakage.
+    return Math.trunc(value);
   }
   if (typeof value === 'string' && value.trim() !== '') {
     const trimmed = value.trim();
diff --git a/src/events.ts b/src/events.ts
index c69e501..b54af9c 100644
--- a/src/events.ts
+++ b/src/events.ts
@@ -243,7 +243,7 @@ export function dispatchEvent(
   const topicName = topics[0]?.sym()?.toString() ?? '';
 
   const actor    = addressField(topics[1]);
-  const sequence = topics[2] ? scValToU64(topics[2]) : 0n;
+  const sequence = topics[2] ? scValToU64(topics[2]) : undefined;
 
   switch (topicName) {
     case TOPIC.WITHDRAWN: {
diff --git a/src/module49.ts b/src/module49.ts
index a115a19..e1fcb3a 100644
--- a/src/module49.ts
+++ b/src/module49.ts
@@ -1,5 +1,5 @@
 import type { StreamInfo } from './types/index.js';
-import { withdrawableLocal } from './utils.js';
+import { withdrawableLocal, streamProgress, normalizeProgress } from './utils.js';
 import { LruMemoCache } from './lru-memo-cache.js';
 
 export interface Module49Config {
@@ -102,19 +102,9 @@ export class Module49 {
     }
 
     this.cacheMisses++;
-this.totalProcessed++;
-const withdrawable = withdrawableLocal(item.stream, nowSec);
-    let progress = 0;
-    const { startTime, endTime } = item.stream;
-    if (nowSec >= startTime) {
-      if (endTime === 0) {
-        progress = 0.5; // open-ended active
-      } else if (nowSec >= endTime) {
-        progress = 1.0;
-      } else {
-        progress = (nowSec - startTime) / (endTime - startTime);
-      }
-    }
+    const withdrawable = withdrawableLocal(item.stream, nowSec);
+
+    const progress = normalizeProgress(streamProgress(item.stream, nowSec));
 
     const computedAt = nowSec;
 
diff --git a/src/tests/events-subscribe.test.ts b/src/tests/events-subscribe.test.ts
index 9d3770f..65a6b1d 100644
--- a/src/tests/events-subscribe.test.ts
+++ b/src/tests/events-subscribe.test.ts
@@ -166,7 +166,7 @@ describe('subscribeToStream', () => {
       onClawback: (e) => { received = e; },
     });
     await vi.waitFor(() => expect(received).toBeDefined());
-    expect(received).toEqual({ sender, amount: 5_000n, sequence: 0n });
+    expect(received).toEqual({ sender, amount: 5_000n, sequence: undefined });
     sub.unsubscribe();
   });
 
diff --git a/src/types/index.ts b/src/types/index.ts
index 6b461d0..b2c32b3 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -132,12 +132,12 @@ export interface GovernorConfig {
 
 // ── Events ──────────────────────────────────────────────────────────────────
 
-export interface WithdrawEvent  { amount: bigint; recipient: string; totalWithdrawn: bigint; remaining: bigint; sequence: bigint; }
-export interface CancelEvent    { refundAmount: bigint; withdrawnSoFar: bigint; sender: string; sequence: bigint; }
-export interface PauseEvent     { pausedAt: number; withdrawable: bigint; sender: string; sequence: bigint; }
-export interface ResumeEvent    { resumedAt: number; sender: string; sequence: bigint; }
-export interface TopUpEvent     { amount: bigint; newBalance: bigint; sender: string; sequence: bigint; }
-export interface ClawbackEvent  { amount: bigint; sender: string; sequence: bigint; }
+export interface WithdrawEvent  { amount: bigint; recipient: string; totalWithdrawn: bigint; remaining: bigint; sequence?: bigint; }
+export interface CancelEvent    { refundAmount: bigint; withdrawnSoFar: bigint; sender: string; sequence?: bigint; }
+export interface PauseEvent     { pausedAt: number; withdrawable: bigint; sender: string; sequence?: bigint; }
+export interface ResumeEvent    { resumedAt: number; sender: string; sequence?: bigint; }
+export interface TopUpEvent     { amount: bigint; newBalance: bigint; sender: string; sequence?: bigint; }
+export interface ClawbackEvent  { amount: bigint; sender: string; sequence?: bigint; }
 
 /** Published once when the factory deploys a new DripStream (`created` topic). */
 export interface CreatedEvent {