diff --git a/docs/roadmap-status.md b/docs/roadmap-status.md
index d6d0e27..891488c 100644
--- a/docs/roadmap-status.md
+++ b/docs/roadmap-status.md
@@ -41,6 +41,7 @@ Implemented now:
 14. Public `/trust` page scaffold aligned with trust-page spec.
 15. Dedicated marketplace OpenAPI contract and examples.
 16. Member app channel contract, examples, backend handoff checklist, and conformance vectors.
+17. Download endpoints now validate wallet membership status before authorizing channel messaging.
 
 Remaining in this repo:
 
diff --git a/docs/secret-system-spec.md b/docs/secret-system-spec.md
index 266138a..9905a82 100644
--- a/docs/secret-system-spec.md
+++ b/docs/secret-system-spec.md
@@ -30,7 +30,8 @@ This flow is the pre-launch identity and commerce envelope. It is not a throwawa
 12. Page confirms via `POST /secret/membership/confirm` and/or status poll.
 13. UI shows `acknowledged · {token}` when membership is active.
 14. Post-mint success state presents `download your platform` links (Desktop/iOS/Android).
-15. Member opens the app, signs in with the same wallet, and receives platform updates through app notifications.
+15. Download endpoints perform wallet membership status checks before channel authorization messaging.
+16. Member opens the app, signs in with the same wallet, and receives platform updates through app notifications.
 
 Privacy and Terms links bypass flow and navigate normally.
 
diff --git a/public/downloads/android/index.html b/public/downloads/android/index.html
index a2f4d8e..8cff867 100644
--- a/public/downloads/android/index.html
+++ b/public/downloads/android/index.html
@@ -36,6 +36,34 @@
     border: 1px solid #d6dce4;
     background: #f7fafc;
   }
+  .status {
+    margin-top: 14px;
+    color: #4c535c;
+    min-height: 18px;
+  }
+  .status.error {
+    color: #7a3a3a;
+  }
+  .cta {
+    margin-top: 8px;
+    border: 1px solid #c8d0da;
+    background: #ffffff;
+    color: #2c2c2c;
+    padding: 8px 14px;
+    font: inherit;
+    letter-spacing: 0.1em;
+    text-transform: lowercase;
+    cursor: pointer;
+  }
+  .download-instructions {
+    margin-top: 12px;
+    border-top: 1px solid #d6dce4;
+    padding-top: 12px;
+    display: none;
+  }
+  .download-instructions.visible {
+    display: block;
+  }
   a { color: #2c2c2c; text-decoration: underline; text-underline-offset: 2px; }
 </style>
 </head>
@@ -43,12 +71,79 @@
 <div class="container">
   <p><a href="/">back</a></p>
   <h1>EDUT Platform Android</h1>
-  <p class="muted">membership channel acknowledged</p>
+  <p class="muted">membership channel verification</p>
   <div class="card">
-    <p>This endpoint is bound to wallet-authenticated membership access.</p>
-    <p>When Android distribution is staged for your designation era, this channel delivers current install instructions.</p>
-    <p>Member updates and entitlement notices are delivered inside the EDUT app after wallet sign-in.</p>
+    <p>Android delivery is tied to wallet-authenticated membership state.</p>
+    <button id="connect-wallet" class="cta" type="button">connect wallet</button>
+    <p id="status" class="status" aria-live="polite"></p>
+    <div id="download-instructions" class="download-instructions">
+      <p>Membership verified. Android distribution remains staged by designation era.</p>
+      <p>When your channel opens, this endpoint delivers current install instructions for Android onboarding.</p>
+      <p>Member updates and entitlement notices are delivered inside the EDUT app after wallet sign-in.</p>
+    </div>
   </div>
 </div>
+<script>
+const connectWalletButton = document.getElementById('connect-wallet');
+const statusNode = document.getElementById('status');
+const instructionsNode = document.getElementById('download-instructions');
+
+function setStatus(message, isError) {
+  statusNode.textContent = message;
+  statusNode.classList.toggle('error', !!isError);
+}
+
+async function fetchMembershipStatus(wallet, chainId) {
+  const params = new URLSearchParams({ wallet });
+  if (chainId !== null && chainId !== undefined) {
+    params.set('chain_id', String(chainId));
+  }
+  const res = await fetch('/secret/membership/status?' + params.toString(), {
+    headers: { Accept: 'application/json' },
+  });
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(text || ('HTTP ' + res.status));
+  }
+  return res.json();
+}
+
+async function handleConnectWallet() {
+  instructionsNode.classList.remove('visible');
+  try {
+    if (!window.ethereum) {
+      setStatus('No wallet detected. Install a wallet and retry.', true);
+      return;
+    }
+
+    setStatus('Connecting wallet...', false);
+    const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
+    if (!Array.isArray(accounts) || accounts.length === 0) {
+      setStatus('Wallet connection was not approved.', true);
+      return;
+    }
+
+    const wallet = accounts[0];
+    const chainHex = await window.ethereum.request({ method: 'eth_chainId' });
+    const chainId = Number.parseInt(chainHex, 16);
+
+    setStatus('Checking membership status...', false);
+    const status = await fetchMembershipStatus(wallet, chainId);
+
+    if (status.status === 'active') {
+      setStatus('Membership active. Android channel is authorized.', false);
+      instructionsNode.classList.add('visible');
+      return;
+    }
+
+    setStatus('Membership is not active for this wallet (' + status.status + ').', true);
+  } catch (err) {
+    const message = err && err.message ? err.message : 'Membership check failed.';
+    setStatus(message, true);
+  }
+}
+
+connectWalletButton.addEventListener('click', handleConnectWallet);
+</script>
 </body>
 </html>
diff --git a/public/downloads/desktop/index.html b/public/downloads/desktop/index.html
index 522ed18..c39d1cb 100644
--- a/public/downloads/desktop/index.html
+++ b/public/downloads/desktop/index.html
@@ -36,6 +36,34 @@
     border: 1px solid #d6dce4;
     background: #f7fafc;
   }
+  .status {
+    margin-top: 14px;
+    color: #4c535c;
+    min-height: 18px;
+  }
+  .status.error {
+    color: #7a3a3a;
+  }
+  .cta {
+    margin-top: 8px;
+    border: 1px solid #c8d0da;
+    background: #ffffff;
+    color: #2c2c2c;
+    padding: 8px 14px;
+    font: inherit;
+    letter-spacing: 0.1em;
+    text-transform: lowercase;
+    cursor: pointer;
+  }
+  .download-instructions {
+    margin-top: 12px;
+    border-top: 1px solid #d6dce4;
+    padding-top: 12px;
+    display: none;
+  }
+  .download-instructions.visible {
+    display: block;
+  }
   a { color: #2c2c2c; text-decoration: underline; text-underline-offset: 2px; }
 </style>
 </head>
@@ -43,12 +71,79 @@
 <div class="container">
   <p><a href="/">back</a></p>
   <h1>EDUT Platform Desktop</h1>
-  <p class="muted">membership channel acknowledged</p>
+  <p class="muted">membership channel verification</p>
   <div class="card">
-    <p>This endpoint is bound to wallet-authenticated membership access.</p>
-    <p>When desktop installers are staged for your designation era, this channel delivers them directly.</p>
-    <p>Member updates and entitlement notices are delivered inside the EDUT app after wallet sign-in.</p>
+    <p>Desktop delivery is tied to wallet-authenticated membership state.</p>
+    <button id="connect-wallet" class="cta" type="button">connect wallet</button>
+    <p id="status" class="status" aria-live="polite"></p>
+    <div id="download-instructions" class="download-instructions">
+      <p>Membership verified. Desktop distribution remains staged by designation era.</p>
+      <p>When your channel opens, this endpoint delivers the current installer package and checksum manifest.</p>
+      <p>Member updates and entitlement notices are delivered inside the EDUT app after wallet sign-in.</p>
+    </div>
   </div>
 </div>
+<script>
+const connectWalletButton = document.getElementById('connect-wallet');
+const statusNode = document.getElementById('status');
+const instructionsNode = document.getElementById('download-instructions');
+
+function setStatus(message, isError) {
+  statusNode.textContent = message;
+  statusNode.classList.toggle('error', !!isError);
+}
+
+async function fetchMembershipStatus(wallet, chainId) {
+  const params = new URLSearchParams({ wallet });
+  if (chainId !== null && chainId !== undefined) {
+    params.set('chain_id', String(chainId));
+  }
+  const res = await fetch('/secret/membership/status?' + params.toString(), {
+    headers: { Accept: 'application/json' },
+  });
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(text || ('HTTP ' + res.status));
+  }
+  return res.json();
+}
+
+async function handleConnectWallet() {
+  instructionsNode.classList.remove('visible');
+  try {
+    if (!window.ethereum) {
+      setStatus('No wallet detected. Install a wallet and retry.', true);
+      return;
+    }
+
+    setStatus('Connecting wallet...', false);
+    const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
+    if (!Array.isArray(accounts) || accounts.length === 0) {
+      setStatus('Wallet connection was not approved.', true);
+      return;
+    }
+
+    const wallet = accounts[0];
+    const chainHex = await window.ethereum.request({ method: 'eth_chainId' });
+    const chainId = Number.parseInt(chainHex, 16);
+
+    setStatus('Checking membership status...', false);
+    const status = await fetchMembershipStatus(wallet, chainId);
+
+    if (status.status === 'active') {
+      setStatus('Membership active. Desktop channel is authorized.', false);
+      instructionsNode.classList.add('visible');
+      return;
+    }
+
+    setStatus('Membership is not active for this wallet (' + status.status + ').', true);
+  } catch (err) {
+    const message = err && err.message ? err.message : 'Membership check failed.';
+    setStatus(message, true);
+  }
+}
+
+connectWalletButton.addEventListener('click', handleConnectWallet);
+</script>
 </body>
 </html>
diff --git a/public/downloads/ios/index.html b/public/downloads/ios/index.html
index 9d4544d..ab5c16c 100644
--- a/public/downloads/ios/index.html
+++ b/public/downloads/ios/index.html
@@ -36,6 +36,34 @@
     border: 1px solid #d6dce4;
     background: #f7fafc;
   }
+  .status {
+    margin-top: 14px;
+    color: #4c535c;
+    min-height: 18px;
+  }
+  .status.error {
+    color: #7a3a3a;
+  }
+  .cta {
+    margin-top: 8px;
+    border: 1px solid #c8d0da;
+    background: #ffffff;
+    color: #2c2c2c;
+    padding: 8px 14px;
+    font: inherit;
+    letter-spacing: 0.1em;
+    text-transform: lowercase;
+    cursor: pointer;
+  }
+  .download-instructions {
+    margin-top: 12px;
+    border-top: 1px solid #d6dce4;
+    padding-top: 12px;
+    display: none;
+  }
+  .download-instructions.visible {
+    display: block;
+  }
   a { color: #2c2c2c; text-decoration: underline; text-underline-offset: 2px; }
 </style>
 </head>
@@ -43,12 +71,79 @@
 <div class="container">
   <p><a href="/">back</a></p>
   <h1>EDUT Platform iOS</h1>
-  <p class="muted">membership channel acknowledged</p>
+  <p class="muted">membership channel verification</p>
   <div class="card">
-    <p>This endpoint is bound to wallet-authenticated membership access.</p>
-    <p>When iOS distribution is staged for your designation era, this channel delivers current install instructions.</p>
-    <p>Member updates and entitlement notices are delivered inside the EDUT app after wallet sign-in.</p>
+    <p>iOS delivery is tied to wallet-authenticated membership state.</p>
+    <button id="connect-wallet" class="cta" type="button">connect wallet</button>
+    <p id="status" class="status" aria-live="polite"></p>
+    <div id="download-instructions" class="download-instructions">
+      <p>Membership verified. iOS distribution remains staged by designation era.</p>
+      <p>When your channel opens, this endpoint delivers current install instructions for iOS onboarding.</p>
+      <p>Member updates and entitlement notices are delivered inside the EDUT app after wallet sign-in.</p>
+    </div>
   </div>
 </div>
+<script>
+const connectWalletButton = document.getElementById('connect-wallet');
+const statusNode = document.getElementById('status');
+const instructionsNode = document.getElementById('download-instructions');
+
+function setStatus(message, isError) {
+  statusNode.textContent = message;
+  statusNode.classList.toggle('error', !!isError);
+}
+
+async function fetchMembershipStatus(wallet, chainId) {
+  const params = new URLSearchParams({ wallet });
+  if (chainId !== null && chainId !== undefined) {
+    params.set('chain_id', String(chainId));
+  }
+  const res = await fetch('/secret/membership/status?' + params.toString(), {
+    headers: { Accept: 'application/json' },
+  });
+  if (!res.ok) {
+    const text = await res.text();
+    throw new Error(text || ('HTTP ' + res.status));
+  }
+  return res.json();
+}
+
+async function handleConnectWallet() {
+  instructionsNode.classList.remove('visible');
+  try {
+    if (!window.ethereum) {
+      setStatus('No wallet detected. Install a wallet and retry.', true);
+      return;
+    }
+
+    setStatus('Connecting wallet...', false);
+    const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
+    if (!Array.isArray(accounts) || accounts.length === 0) {
+      setStatus('Wallet connection was not approved.', true);
+      return;
+    }
+
+    const wallet = accounts[0];
+    const chainHex = await window.ethereum.request({ method: 'eth_chainId' });
+    const chainId = Number.parseInt(chainHex, 16);
+
+    setStatus('Checking membership status...', false);
+    const status = await fetchMembershipStatus(wallet, chainId);
+
+    if (status.status === 'active') {
+      setStatus('Membership active. iOS channel is authorized.', false);
+      instructionsNode.classList.add('visible');
+      return;
+    }
+
+    setStatus('Membership is not active for this wallet (' + status.status + ').', true);
+  } catch (err) {
+    const message = err && err.message ? err.message : 'Membership check failed.';
+    setStatus(message, true);
+  }
+}
+
+connectWalletButton.addEventListener('click', handleConnectWallet);
+</script>
 </body>
 </html>