WaxSeal SDK

Cryptographic identity for the open web and for AI agents.
One Ed25519 keypair. One 64-character fingerprint. Permanent on-chain record.

waxseal.id · Developer Docs · Get your seal

@waxseal/verify on npm @waxseal/mcp on npm

Packages

Package	What it is	Install
`@waxseal/verify`	Browser + Node SDK — verify identities, validate signatures, embed badges, verify webhooks	`npm install @waxseal/verify`
`@waxseal/mcp`	MCP server for Claude, Cursor, Windsurf, and VS Code — verify identities, sign documents, gate AI actions with human approvals	`npx @waxseal/mcp`

`@waxseal/mcp` — for AI agents

npm

Give Claude, Cursor, Windsurf, or VS Code Copilot a cryptographic identity layer in under two minutes.

config.json

{
  "mcpServers": {
    "waxseal": {
      "command": "npx",
      "args": ["-y", "@waxseal/mcp"],
      "env": {
        "WAXSEAL_PRIVATE_KEY_PEM": "-----BEGIN PRIVATE KEY-----\n<your key>\n-----END PRIVATE KEY-----"
      }
    }
  }
}

No install needed. Use the hosted server in any HTTP-capable MCP client: https://api.waxseal.id/mcp

What the 6 tools give your agent:

Tool	What it does	Key needed?
`waxseal.info`	Platform overview, tiers, and tool guide	No
`waxseal.identity.verify`	Look up fingerprint → name, chain, wallet, status	No
`waxseal.signature.verify`	Confirm an Ed25519 signature against an on-chain key	No
`waxseal.approval.verify`	Validate a human approval token before executing	No
`waxseal.document.sign`	Sign any content with your WaxSeal private key	Yes
`waxseal.approval.create`	Create a signed, time-limited approval token	Yes

Verify-only tools work with zero configuration. Signing tools require WAXSEAL_PRIVATE_KEY_PEM.

→ Full MCP docs · Smithery listing · npm

`@waxseal/verify` — for apps and backends {#waxsealverify}

Terminal

npm install @waxseal/verify

Works in React, Vue, Node.js, n8n, serverless functions, and any runtime with fetch.

WaxSeal examples

Two modes, one fingerprint

Mode 1 · Badge Verification

"Does this WaxSeal exist and is it real?"

Confirm a seal is on-chain. No user interaction required — the fingerprint alone is enough.

Use cases

✦ Verified author badge on blog posts and articles
✦ Contributor identity on GitHub-style tools
✦ Publisher verification on CMS platforms
✦ Prove you created something before AI did

server.ts

import { verifySeal } from "@waxseal/verify";

const seal = await verifySeal({ fingerprint: "a1b2c3d4..." });

if (seal.valid && seal.onChain) {
  console.log(seal.displayName, "·", seal.chain);
  // "Ada Lovelace · base"
}

Mode 2 · Login & Action Approval

"Did this person sign this, right now?"

A signed challenge proves the key holder is present — replaces passwords, OTP, and email loops entirely.

Use cases

✦ Passwordless sign-in — no email, no OTP, no credentials to breach
✦ Approve a document or high-value transaction
✦ Gate a comment, post, or vote behind verified identity
✦ Issue an API key only to verified seal holders
✦ Automate identity checks in n8n / Make.com / Zapier

server.ts

const seal = await verifySeal({
  fingerprint: "a1b2c3d4...",
  message:     "I approve this transfer.",
  signature:   "base64url...",
});

if (seal.valid && seal.onChain && seal.signatureValid) {
  // Cryptographic proof — no password, no session token
}

React Badge

server.ts

import { WaxSealBadge } from "@waxseal/verify/badge";

<WaxSealBadge fingerprint="a1b2c3d4..." />

Or build your own:

server.ts

import { useEffect, useState } from "react";
import { verifySeal, type VerifyResult } from "@waxseal/verify";

export function SealBadge({ fingerprint }: { fingerprint: string }) {
  const [seal, setSeal] = useState<VerifyResult | null>(null);

  useEffect(() => {
    let active = true;
    verifySeal({ fingerprint }).then((r) => active && setSeal(r));
    return () => { active = false; };
  }, [fingerprint]);

  if (!seal?.valid || !seal.onChain) return null;

  return (
    <a href={`https://waxseal.id/seal/${seal.fingerprint}`} target="_blank" rel="noopener noreferrer">
      ✦ {seal.displayName ?? seal.fingerprint.slice(0, 8)}
    </a>
  );
}

HTML Embed (no build step)

html

<script src="https://waxseal.id/embed.js"></script>
<span data-wax-seal="YOUR_64_CHAR_FINGERPRINT"></span>

Email — script tags are blocked by mail clients. Use a plain link instead: <a href="https://waxseal.id/seal/YOUR_FINGERPRINT">Verify my Wax Seal</a>

Webhook Verification

server.ts

import { verifyWebhookSignature, isWaxSealWebhookEvent } from "@waxseal/verify/webhooks";

app.post("/webhook/waxseal", express.raw({ type: "*/*" }), (req, res) => {
  const valid = verifyWebhookSignature({
    body:      req.body,
    signature: String(req.headers["x-waxseal-signature"]),
    secret:    process.env.WAXSEAL_WEBHOOK_SECRET,
  });

  if (!valid) return res.status(401).send("Invalid signature");

  const event = JSON.parse(req.body.toString());

  if (isWaxSealWebhookEvent(event, "seal.minted")) {
    console.log("New seal:", event.data.fingerprint, "on", event.data.chain);
  }

  res.sendStatus(200);
});

Webhook events

Event	When it fires
`seal.verified`	A seal was verified via the API
`seal.minted`	A new seal NFT was minted on-chain
`seal.updated`	Seal name, avatar, or metadata changed
`seal.subscription.started`	A seal holder started a paid subscription
`seal.subscription.ended`	A subscription expired or was cancelled
`challenge.approved`	A login challenge was verified — user authenticated

REST API — no SDK, no key required

Code

POST https://api.waxseal.id/v1/verify
Content-Type: application/json

{
  "fingerprint": "<64-char hex>",
  "message":     "...",
  "signature":   "..."
}

config.json

{
  "valid": true,
  "onChain": true,
  "chain": "base",
  "displayName": "Ada Lovelace",
  "walletAddress": "0x…",
  "signatureValid": true,
  "verifiedAt": "2026-01-01T00:00:00Z"
}

Works with everything

Stack	How
React / Vue / Svelte	`npm install @waxseal/verify`
Node.js / Express	Same package + webhook helper
n8n	HTTP Request node → REST API, or npm package in Code node
Make.com	HTTP module → REST API
Zapier	Webhook by Zapier trigger
PHP / Python / Go	Plain HTTP POST to the REST API
Static HTML / CMS	Two-line `embed.js` snippet
Claude / Cursor / Windsurf / VS Code	`@waxseal/mcp`

VerifyResult type

type VerifyResult = {
  valid: boolean;
  fingerprint: string;
  onChain: boolean;
  chain?: "ethereum" | "base" | "bnb";
  walletAddress?: string;
  displayName?: string;
  publicKeyConfirmed?: boolean;
  signatureValid?: boolean;
  verifiedAt?: string;
  error?: string;
};

WaxSeal SDK

Packages

@waxseal/mcp — for AI agents

@waxseal/verify — for apps and backends {#waxsealverify}

Two modes, one fingerprint

Mode 1 · Badge Verification

Mode 2 · Login & Action Approval

React Badge

HTML Embed (no build step)

Webhook Verification

REST API — no SDK, no key required

Works with everything

VerifyResult type

`@waxseal/mcp` — for AI agents

`@waxseal/verify` — for apps and backends {#waxsealverify}