diff --git a/docs/DEPLOY.md b/docs/DEPLOY.md
index ac94137..9e19568 100644
--- a/docs/DEPLOY.md
+++ b/docs/DEPLOY.md
@@ -243,3 +243,33 @@ Neither command needs a secret key. Balance checks take public keys:
 - **Never** commit `.env` with secrets (already in `.gitignore`).
 - **Never** put `S…` secret keys in `VITE_*` — they end up in public JS.
 - Rotate any key that was pasted in chat or logs.
+
+## Support log redaction & troubleshooting
+
+Before attaching terminal transcripts, container logs, or browser exports to an
+issue, pull request, or support channel, strip every credential, bearer token,
+and pre-reveal secret listed below. Structured logger output from
+`@sub-rosa/logging` automatically scrubs common secret keys (`secret`, `token`,
+`password`, `privateKey`, `credential`, `cookie`, `authorization`, `apiKey`,
+`mnemonic`, `seedPhrase`), `S…` Stellar secret seeds, PEM blocks, `Bearer` /
+`Basic` headers, and URL credentials to `[REDACTED]`, but raw shell command
+lines, unhandled crash dumps, and DevTools HAR files can still include them:
+
+- **Keeper logs (`services/keeper`):** Remove `KEEPER_SECRET`, `OPERATOR_SECRET`,
+  and `BIDDER_SECRET` (`S…` Stellar secret seeds), provider-authenticated
+  `RPC_URL` or `STELLAR_RPC_URL` strings (basic-auth userinfo
+  `https://user:pass@…` or query parameters such as `?api_key=…` / `?token=…`),
+  and any unrevealed bid `value` or `nonce` prior to Drand round `R`.
+- **Appraisal API logs (`services/appraisal-api`):** Remove
+  `FACILITATOR_SECRET`, `Authorization` (`Bearer` / `Basic`) headers, x402
+  payment headers (`X-Payment` / signed XDR payloads), and provider-keyed
+  `RPC_URL` endpoints.
+- **SDK & relayer logs (`packages/sdk`):** Remove `STELLAR_SECRET_KEY`,
+  `OZ_CHANNELS_API_KEY`, session Ed25519 private keys, round auditor secret
+  keys, and unrevealed bid plaintext (`value`, `nonce`) before `open_reveal`
+  succeeds on-chain.
+- **Browser & DevTools logs (`apps/web`):** Remove passkey/session key material
+  in `localStorage` or `sessionStorage`, `Cookie` and `Authorization` headers in
+  Network HAR exports, wallet seed phrases or `S…` secret keys, and local
+  unrevealed bid values/nonces before the round enters `Revealing`.
+
diff --git a/scripts/check-deploy-docs.test.mjs b/scripts/check-deploy-docs.test.mjs
index 86628e0..728191f 100644
--- a/scripts/check-deploy-docs.test.mjs
+++ b/scripts/check-deploy-docs.test.mjs
@@ -1,13 +1,14 @@
 // Copyright (c) 2026 Sub Rosa contributors
 import { execFileSync } from "node:child_process";
-import { mkdirSync, mkdtempSync, copyFileSync, writeFileSync, rmSync } from "node:fs";
+import { mkdirSync, mkdtempSync, copyFileSync, readFileSync, writeFileSync, rmSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { describe, it } from "node:test";
+import { fileURLToPath } from "node:url";
 import assert from "node:assert/strict";
 
-const SCRIPT_PATH = new URL("check-deploy-docs.mjs", import.meta.url).pathname;
-const CWD = new URL("..", import.meta.url).pathname;
+const SCRIPT_PATH = fileURLToPath(new URL("check-deploy-docs.mjs", import.meta.url));
+const CWD = fileURLToPath(new URL("..", import.meta.url));
 
 function runCheck(env = {}) {
   return execFileSync("node", [SCRIPT_PATH], {
@@ -140,4 +141,46 @@ describe("check-deploy-docs", () => {
       rmSync(tmpDir, { recursive: true, force: true });
     }
   });
+
+  it("documents safe support-log redaction across keeper, appraisal, SDK, and browser logs", () => {
+    const deployDoc = readFileSync(join(CWD, "docs", "DEPLOY.md"), "utf8");
+    const sectionIdx = deployDoc.indexOf("## Support log redaction & troubleshooting");
+    assert.ok(
+      sectionIdx !== -1,
+      "docs/DEPLOY.md must include '## Support log redaction & troubleshooting'",
+    );
+
+    const section = deployDoc.slice(sectionIdx);
+    for (const surface of [
+      "Keeper logs (`services/keeper`)",
+      "Appraisal API logs (`services/appraisal-api`)",
+      "SDK & relayer logs (`packages/sdk`)",
+      "Browser & DevTools logs (`apps/web`)",
+    ]) {
+      assert.ok(
+        section.includes(surface),
+        `support-log redaction section must cover ${surface}`,
+      );
+    }
+
+    for (const field of [
+      "KEEPER_SECRET",
+      "OPERATOR_SECRET",
+      "BIDDER_SECRET",
+      "FACILITATOR_SECRET",
+      "STELLAR_SECRET_KEY",
+      "OZ_CHANNELS_API_KEY",
+      "Authorization",
+      "Cookie",
+      "localStorage",
+      "sessionStorage",
+      "nonce",
+      "[REDACTED]",
+    ]) {
+      assert.ok(
+        section.includes(field),
+        `support-log redaction section must list ${field}`,
+      );
+    }
+  });
 });