Implementing Sign‑In with Ethereum (SIWE)

Your login is the blocker, not your app

• You really need “Sign in with Ethereum” for wallet users, but procurement wants SOC2 controls, SSO/Okta compatibility, audit logs, and predictable support costs. It’s a tough spot.
• On the engineering side, there are all those tricky edge cases to deal with: smart contract wallets (ERC‑1271), counterfactual AA accounts (ERC‑6492), WalletConnect session drift, replay protections, and figuring out cookie hardening that won’t mess up cross-domain flows.
• The bottom line? You’re missing those release dates while security reviews get stuck on concerns like “nonce reuse,” “domain binding,” and “who’s in charge of verifying contract wallets?”

The Cost of Getting SIWE Wrong

• Product risk: Wallet users might just bail on you if the flow trips up on passkey/AA wallets, or if they see the wrong “domain” in the message. It's key for wallets to verify the request origin against the message domain. If this goes wrong, you can officially call it a failed launch day. (eips.ethereum.org)
• Security risk: Let’s talk about those 8-char nonce minimums and RFC3339 timestamps--they're not just nice little extras; they’re required by the spec. If you skip enforcing things like replay, cross-origin, or mis-scoped sessions on the server side, you might find yourself dealing with some serious issues that slipped past QA. (eips.ethereum.org)
• Compatibility risk: So, EOA signatures check out using ecrecover; but if you’re dealing with contract wallets, you need ERC-1271. And let’s not forget, if AA accounts aren’t deployed yet, they’ll require ERC-6492 wrapper detection. If there's a hiccup in your verification code, you risk silently locking out some high-value users. Ouch! (eips.ethereum.org)
• Integration risk: With WalletConnect v2+, you get One-Click Auth and ReCaps. But here’s the thing--if your SIWE message and capability URIs aren’t aligned, you’re missing out on that sweet, seamless auth+authorization user experience. That could mean waving goodbye to the conversions you promised your team. Not cool. (docs.walletconnect.network)
• Compliance risk: If your cookies don’t have HttpOnly, SameSite, and secure flags, they’re likely to bite the dust during pen tests and SOC2 control reviews. Plus, make sure your CSRF and origin binding are explicit--not just assumed. Stay safe out there! (owasp.org)

7Block’s Enterprise SIWE Methodology (Technical but Pragmatic)

We roll out SIWE as a standards-first module that seamlessly integrates into your existing stack, meets security review requirements, and aligns with your go-to-market timelines.

1) Requirements and Threat Model (1-2 Weeks)

• Let’s get on the same page about what we want to achieve: We’re looking at SSO coexistence with Okta and ADFS, adding a “just-wallet” login option, focusing on data minimization, and ensuring support flows are smooth.
• We need to align our SOC2 (CC6.x) and OWASP session controls with SIWE. This includes making sure we’ve got replay prevention, domain binding, log integrity, and a solid incident triage process in place.
• Time to pick how we want to integrate:
  • We can go with app-embedded SIWE using our backend verifier; or
  • Use an OIDC bridge through the SIWE OIDC provider for quick SSO federation with options like Okta, Auth0, or Azure AD. Check out the details in the docs.login.xyz.

2) Architecture and Standards Mapping

• Authentication: We're using the EIP‑4361 message format, which includes the necessary fields like domain, address, uri, version=1, chainId, nonce, and issuedAt. Plus, there are optional fields like expirationTime, notBefore, requestId, and resources. Wallets should verify the origin against the domain. Check it out here.
• Verification Strategy:
  • EOA Path: This involves recovering the address and then matching it to the message address.
  • Contract Wallet Path (ERC‑1271): Here, we call isValidSignature and handle that 0x1626ba7e magic value. You can read more about it here.
  • Counterfactual AA Path (ERC‑6492): This one checks for the magic suffix, unwraps the message, and simulates deploying and checking isValidSignature before we wrap things up. For more details, visit this link.
• Authorization (optional, but recommended): We recommend using ReCaps (EIP‑5573), which are encoded as URNs in SIWE Resources and reflected in the statement text for informed consent. This pairs nicely with WalletConnect One-Click Auth. Learn more about it here.
• Transport and Connectivity: We're implementing WalletConnect v2 for pairing and client authentication. It's a good idea to plan for link mode or one-click options to make reconnecting smoother. Check the specs here.
• Session Model: We're looking at short-lived SIWE that transitions into a server-issued session that’s set to HttpOnly, Secure, and SameSite, stored in Redis. We’ll rotate these sessions when privileges change. Don’t forget to reference OWASP cookie flags and host-prefix patterns for security! You can find more info here.

3) Build with battle-tested libraries

• Parsing/validation: Check out SpruceID’s siwe libraries available in TS, Python, Rust, and Elixir. Plus, there’s a handy message linter/validator for your CI needs. You can find it here.
• Wallet connectivity: Use the WalletConnect SDK for a seamless One-Click Auth experience--don’t forget to set up auth events and fallbacks! More info is at walletconnect.network.
• OIDC bridge (if needed): If you need it, deploy the SIWE OIDC (Axum/Redis or Cloudflare Worker mode) and register with Okta/Auth0 to make sure you're compliant with standards as an IdP. Check it out here.

4) Security Hardening and Audit Readiness

• Make sure your server is sticking to ABNF standards. This means rejecting any mismatched origin or domain, as well as old nonces, and tying sessions to the address, origin, and user agent.
• When it comes to cookie security, go for a __Host‑ prefixed session cookie. Ensure it’s set to Secure, HttpOnly, and adjust SameSite to either Strict or Lax based on the user experience you want. You can find more details on this over at owasp.org.
• Don’t skimp on logging! Make sure you have structured audit logs for all your SIWE attempts. This should include the chainId, domain, validation path (EOA/1271/6492), and WalletConnect session IDs.

5) Enterprise Rollout and SLOs

• We need to set up a load test verification path that includes EOA, 1271, and 6492. Don’t forget to simulate wallet mixes like MetaMask, Coinbase Smart Wallet, Safe, and Ledger.
• For our Service Level Objectives (SLOs), we’re aiming for an average server-side verification time of less than 250ms, a median end-to-end authentication time of under 1.5 seconds on broadband, and zero on-chain gas fees for login. Just a heads-up: SIWE is designed to be off-chain according to EIP-4361.

Where We Plug In

• We offer end-to-end delivery through our web3 development services and custom blockchain development services.
• Our approach includes security by design, thanks to our security audit services.
• Need to connect to existing systems? We’ve got you covered with our blockchain integration.
• If you're looking for gated access or want to incorporate token utility with login, check out our smart contract development and DeFi development services.

Practical, Implementation-Ready Examples

When diving into a new project or technology, it’s super helpful to have examples that you can actually put to use right away. Here are some practical, ready-to-implement examples that’ll make your life a bit easier.

Example 1: Simple Web Scraping with Python

If you want to scrape data from a website using Python, here's a quick script you can work with:

import requests
from bs4 import BeautifulSoup

url = 'https://example.com'
response = requests.get(url)
soup = BeautifulSoup(response.text, 'html.parser')

# Find all the titles on the page
titles = soup.find_all('h1')
for title in titles:
    print(title.text)

This code grabs all the

titles from a webpage. Just swap out 'https://example.com' with the URL you’re interested in!

Example 2: Basic Data Analysis with Pandas

If you're into data analysis, check out this simple example using Pandas:

import pandas as pd

# Load data from a CSV file
data = pd.read_csv('data.csv')

# Display the first 5 rows
print(data.head())

# Get a summary of the data
print(data.describe())

Just make sure to replace 'data.csv' with your own data file path, and you'll be all set to analyze your data!

Example 3: Sending Emails with Node.js

Want to send an email using Node.js? Here’s a straightforward way to do it with the nodemailer package:

const nodemailer = require('nodemailer');

let transporter = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: 'your-email@gmail.com',
        pass: 'your-password'
    }
});

let mailOptions = {
    from: 'your-email@gmail.com',
    to: 'receiver-email@example.com',
    subject: 'Hello!',
    text: 'This is a test email.'
};

transporter.sendMail(mailOptions, function(error, info){
    if (error) {
        return console.log(error);
    }
    console.log('Email sent: ' + info.response);
});

Don't forget to replace the email addresses and password with your own info. This little script sends a basic email--easy peasy!

Example 4: Basic REST API with Flask

For those who dabble in web development, here’s a simple REST API example using Flask:

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/api', methods=['GET'])
def home():
    return jsonify({'message': 'Hello, World!'})

if __name__ == '__main__':
    app.run(debug=True)

This sets up a basic API that responds with a friendly message. Just run the script, and you’re good to go!

Conclusion

There you have it--some practical examples you can try out today! Whether you're scraping web data, analyzing datasets, sending emails, or building APIs, these snippets should give you a solid starting point. Happy coding!

Node/TypeScript Verifier with ERC‑1271 and ERC‑6492

When you're diving into the world of smart contracts, verifying signatures becomes crucial. That’s where ERC‑1271 and ERC‑6492 come into play. Let’s break down what these standards are and how you can implement a verifier using Node.js and TypeScript.

What are ERC‑1271 and ERC‑6492?

• ERC‑1271 is a standard that allows contracts to validate signatures, which is super handy for multi-signature wallets and smart contract-based accounts.
• ERC‑6492 adds the ability for smart contracts to manage user-defined permissions, making it easier to interact with complex permission scenarios in decentralized applications (dApps).

Getting Started

To build a verifier that utilizes both ERC‑1271 and ERC‑6492 in a Node/TypeScript environment, you’ll need to set up a project and install some dependencies.

Setting Up Your Project

1. First, create a new directory for your project and initialize it:

   mkdir my-verifier
   cd my-verifier
   npm init -y

2. Now, let’s install TypeScript and the necessary Ethereum libraries:

   npm install typescript ts-node ethers @types/node --save-dev

3. Then, set up a basic TypeScript configuration file:

   npx tsc --init

Implementing the Verifier

Here’s a basic example of how to implement the verifier:

import { ethers } from "ethers";

async function verifySignature(
  contractAddress: string,
  signerAddress: string,
  signature: string,
  data: string
) {
  const provider = new ethers.providers.JsonRpcProvider("https://your.ethereum.node");
  const contract = new ethers.Contract(contractAddress, [
    "function isValidSignature(bytes32 hash, bytes memory signature) public view returns (bytes4)"
  ], provider);

  const hash = ethers.utils.hashMessage(data); // Hash the message

  const result = await contract.isValidSignature(hash, signature);
  return result === "0x1626ba7e"; // The return value for a valid signature
}

// Example usage
(async () => {
  const valid = await verifySignature("0xYourContractAddress", "0xSignerAddress", "0xSignature", "Data to verify");
  console.log("Is the signature valid? ", valid);
})();

Error Handling

It’s a good idea to add some error handling to your verifier:

async function verifySignature(
  contractAddress: string,
  signerAddress: string,
  signature: string,
  data: string
) {
  try {
    const provider = new ethers.providers.JsonRpcProvider("https://your.ethereum.node");
    const contract = new ethers.Contract(contractAddress, [
      "function isValidSignature(bytes32 hash, bytes memory signature) public view returns (bytes4)"
    ], provider);

    const hash = ethers.utils.hashMessage(data); // Hash the message

    const result = await contract.isValidSignature(hash, signature);
    return result === "0x1626ba7e"; // The return value for a valid signature
  } catch (err) {
    console.error("Error verifying signature: ", err);
    return false;
  }
}

Conclusion

And there you have it! With this setup, you can now verify signatures using ERC‑1271 and manage permissions through ERC‑6492 in your Node.js and TypeScript applications. This opens up a lot of possibilities for creating robust decentralized applications. Just remember to replace placeholder values like "https://your.ethereum.node" and contract addresses with your actual values.

Feel free to reach out or drop your questions below if you need any help!

// pnpm add siwe viem abitype zod
// Assumes: public RPC per chainId, Redis for nonces, and an allowlist of origins.

import { SiweMessage } from 'siwe';
import { createPublicClient, http, isAddress, getBytecode } from 'viem';
import { mainnet, polygon, arbitrum, base } from 'viem/chains';

const chainsById = new Map<number, any>([
  [1, mainnet], [137, polygon], [42161, arbitrum], [8453, base],
]);

const ERC1271_ABI = [
  { type: 'function', name: 'isValidSignature', stateMutability: 'view',
    inputs: [{ name: '_hash', type: 'bytes32' }, { name: '_signature', type: 'bytes' }],
    outputs: [{ name: 'magicValue', type: 'bytes4' }]
  },
] as const;

const MAGIC_1271 = '0x1626ba7e';
const MAGIC_6492_SUFFIX = '0x6492649264926492649264926492649264926492649264926492649264926492';

function has6492Suffix(sigHex: `0x${string}`) {
  return sigHex.toLowerCase().endsWith(MAGIC_6492_SUFFIX.slice(2));
}

export async function verifySiwe({
  rawMessage, signature, expectedDomain, expectedOrigin,
}: {
  rawMessage: string;
  signature: `0x${string}`;
  expectedDomain: string;       // e.g., "app.example.com"
  expectedOrigin: string;       // e.g., "https://app.example.com"
}) {
  const msg = new SiweMessage(rawMessage);
  // Spec conformance: domain must match request origin, version=1, nonce fresh, timestamps RFC3339
  if (msg.domain !== expectedDomain) throw new Error('Domain mismatch');
  if (msg.version !== '1') throw new Error('Unsupported SIWE version');
  if (!isAddress(msg.address)) throw new Error('Bad address');
  if (new Date(msg.expirationTime || 0).getTime() && new Date(msg.expirationTime!).getTime() < Date.now()) {
    throw new Error('Expired SIWE');
  }
  // Nonce: fetch and invalidate server-side (Redis). Required by spec.
  await assertAndConsumeNonce(msg.nonce); // implement

  // Bind session to (address, chainId, origin)
  const chain = chainsById.get(Number(msg.chainId));
  if (!chain) throw new Error('Unsupported chain');
  const client = createPublicClient({ chain, transport: http() });

  // 1) Try normal EOA recover via the siwe lib
  try {
    await msg.validate(signature, expectedOrigin);
    return { address: msg.address, method: 'eoa' };
  } catch (e) {
    // fallthrough to 1271/6492
  }

  // 2) Contract wallets (ERC-1271) and AA predeploy (ERC-6492)
  const code = await getBytecode(client, { address: msg.address as `0x${string}` });

  if (has6492Suffix(signature)) {
    // For 6492, unwrap and simulate deploy+isValidSignature per spec (implementation detail depends on wallet wrapper).
    // Many libraries expose helpers; otherwise, call the indicated factory via eth_call, then isValidSignature.
    const ok = await verifyWith6492(client, msg, signature); // implement per ERC-6492
    if (ok) return { address: msg.address, method: 'erc6492' };
  }

  if (code && code !== '0x') {
    // ERC-1271 path
    const digest = await msg.prepareMessage(); // string to hash; siwe handles ERC-191 prefixing
    const hash = client.chain.formatters?.transactionRequest?.hash?.(digest) ?? (await import('viem')).keccak256(Buffer.from(digest));
    const result = await client.readContract({
      address: msg.address as `0x${string}`,
      abi: ERC1271_ABI,
      functionName: 'isValidSignature',
      args: [hash as `0x${string}`, signature],
    });
    if (result.toLowerCase() === MAGIC_1271) return { address: msg.address, method: 'erc1271' };
  }

  throw new Error('Invalid SIWE signature');
}

Key Points:

• We take domain/origin, version=1, nonce usage, and expiration seriously, all in line with EIP‑4361. Wallets should verify the origin, but servers still need to keep an eye on things. Check it out here: (eips.ethereum.org).
• For the ERC‑1271 path, we're using the isValidSignature method along with the magic value 0x1626ba7e. You can read more about it here: (eips.ethereum.org).
• The ERC‑6492 path is pretty cool because it spots the magic suffix and simulates a deployment before the 1271 verification kicks in for counterfactual AA wallets. More details can be found here: (eip.info).

SIWE Message with ReCaps (Auth + Delegated Capabilities)

In this section, we'll dive into creating a SIWE (Sign-In With Ethereum) message that incorporates ReCaps for authentication and delegated capabilities. This setup lets users authenticate while giving you the ability to manage their permissions smoothly.

What is SIWE?

SIWE is a method that uses Ethereum signatures to let users log into applications without needing traditional credentials like usernames and passwords. It leverages the security of blockchain technology--pretty cool, right?

Building the SIWE Message

Here's how you can create a SIWE message. Below, I've provided a sample code snippet to guide you in the right direction:

const { ethers } = require("ethers");

const domain = {
    name: "My DApp",
    version: "1",
    chainId: 1,
    verifyingContract: "0xYourContractAddress",
};

const types = {
    Message: [
        { name: "iss", type: "string" },
        { name: "address", type: "address" },
        { name: "nonce", type: "string" },
        { name: "createdAt", type: "uint256" },
    ],
};

const message = {
    iss: "https://mydapp.com",
    address: "0xUserAddress",
    nonce: "randomNonce",
    createdAt: Math.floor(Date.now() / 1000),
};

// Here’s how you can sign the message
async function signMessage() {
    const provider = new ethers.providers.Web3Provider(window.ethereum);
    const signer = provider.getSigner();
    const signature = await signer._signTypedData(domain, types, message);
    console.log("Signature:", signature);
}

// Don't forget to handle the user's wallet connection and transaction signing

Understanding ReCaps

ReCaps (Reputation Capabilities) are powerful tools that allow you to set permissions for users based on their on-chain reputation. This means you can grant or restrict access to features in your app based on their activities or status.

By combining SIWE messages with ReCaps, you enable a secure way for users to authenticate and for you to manage their capabilities effectively.

Next Steps

1. Integrate with Your DApp: Take the code above and tweak it for your specific application.
2. Experiment with Permissions: See how you can use ReCaps to enhance user experience based on their reputation in your ecosystem.
3. Stay Updated: Keep an eye on developments in SIWE and ReCaps--these technologies are constantly evolving!

For more details on SIWE, check out the Ethereum documentation and explore how it fits into your project's architecture. Happy coding!

example.com wants you to sign in with your Ethereum account:
0xabcDEFabcDEFabcDEFabcDEFabcDEFabcDEFabcd

I authorize https://example.com to read profile and write settings for my account during this session.

URI: https://example.com
Version: 1
Chain ID: 1
Nonce: Njk4bU1uQj
Issued At: 2026-01-20T18:00:00.000Z
Expiration Time: 2026-01-20T19:00:00.000Z
Resources:
- urn:recap:eyJhdHQiOnsiaHR0cHM6Ly9hcGkuZXhhbXBsZS5jb20vIjp7InJlYWQvcHJvZmlsZSI6W3tdXSwid3JpdGUvc2V0dGluZ3MiOlt7fV19fX0

• The last entry in Resources packs a ReCap Details Object into base64url. This basically wraps up the capabilities for a quick human review. With WalletConnect One-Click Auth, you can merge session creation and SIWE with ReCaps, which helps cut down on the number of prompts you see. (eips.ethereum.org)

Cookie Hardening for Enterprise Sessions (Express)

When it comes to securing your web applications, cookie hardening is a must, especially in enterprise environments. Utilizing Express.js, let’s explore how to bolster the security around your session cookies.

1. Use Secure Cookies

Make sure your cookies are only sent over HTTPS connections. This prevents snoopers from intercepting sensitive data. You can enable this by setting the secure flag when you create your session cookies.

app.use(session({
  secret: 'your-secret-key',
  resave: false,
  saveUninitialized: true,
  cookie: { secure: true } // Use true for HTTPS
}));

2. Set HttpOnly Flag

By setting the HttpOnly flag, you help protect your cookies from being accessed via JavaScript, which can thwart some types of cross-site scripting (XSS) attacks.

app.use(session({
  cookie: { httpOnly: true }
}));

3. Set SameSite Attribute

This attribute helps protect against cross-site request forgery (CSRF) attacks. You can set it to Strict or Lax depending on your application’s requirements.

app.use(session({
  cookie: { sameSite: 'Lax' } // or 'Strict'
}));

4. Specify Cookie Expiration

It’s good practice to limit how long your session cookies last. You can specify an expiration time to help reduce risk if a session gets hijacked.

app.use(session({
  cookie: { maxAge: 1000 * 60 * 60 // 1 hour }
}));

5. Use Strong Secrets

Always use a strong, unpredictable secret key to sign your session cookies. This key is crucial for the security of your signed cookies.

const session = require('express-session');
const crypto = require('crypto');

const secret = crypto.randomBytes(64).toString('hex');

app.use(session({
  secret: secret
}));

Conclusion

By implementing these cookie hardening techniques in your Express.js applications, you're taking important steps to ensure that your sessions remain secure. Don't skimp on security--it's a vital part of building trustworthy web applications!

For more details, check out the Express session documentation.

app.set('trust proxy', 1);
app.use(session({
  name: '__Host-sid',
  secret: process.env.SESSION_SECRET!,
  cookie: {
    path: '/',
    httpOnly: true,
    secure: true,
    sameSite: 'lax',   // strict for admin flows
    maxAge: 1000 * 60 * 30
  },
  saveUninitialized: false,
  resave: false,
  rolling: true
}));

• Go with the __Host‑ prefix, and make sure to set your cookies as Secure, HttpOnly, and SameSite, following OWASP's guidelines. For those sensitive actions, if it doesn’t mess with user experience, set it to Strict. (owasp.org)

Wallets, Connectivity, and UX Considerations

• With WalletConnect v2+, the new "One‑Click Auth" feature makes starting a Sign session and authenticating with a SIWE+ReCaps bundle super easy. This helps cut down on those annoying context switches and fits right in with the WalletConnect pairing model. Check it out here.
• The WalletConnect SDK has a massive reach, supporting over 80,000 apps, which helps keep things running smoothly with less overhead. Plus, their Certified programs and Verify API really boost trust--something that enterprise risk teams will definitely appreciate. You can find more info here.
• SIWE is based on an open EIP‑4361 standard, meaning that all the message fields, ABNF, and wallet origin checks are clearly laid out. Make sure to use the spec as your security acceptance criteria. More details are available here.
• Let's be real: the "spray-and-pray" approach to "web3 login" just won't cut it for procurement. Instead, stick with the maintained SIWE docs, validator, and libraries that they offer. You can find what you need here.

SSO/Okta/Auth0 and OIDC Federation

• If you want to use SIWE alongside SSO, go ahead and set up the SIWE OIDC provider and register it as a custom IdP in Okta/Auth0. This way, you can manage your policies, MFA, deprovisioning, and SCIM all in one spot, while still enabling wallet sign-ins. Check out the details here: (docs.login.xyz).
• To stay compliant, make sure you send your audit logs into your SIEM. Include these fields: subject address, chainId, domain, verification method (EOA/1271/6492), WalletConnect peer, and capability URNs (if you’ve got ReCaps enabled).

Emerging Best Practices We Recommend Right Now

• Enforce Spec-Level Guardrails:
  • Make sure the nonce is for one-time use only, should be at least 8 alphanumeric characters; and invalidate it once the user successfully signs in. (eips.ethereum.org)
  • Sessions should be tied to the address (not the ENS) and the origin. The message’s URI should help identify the relying party. Always avoid accepting any mismatched domain or scheme. (eips.ethereum.org)
• Contract Wallet Compatibility First:
  • Always check for contract code and run ERC‑1271 before you declare a failure.
  • Consider adding ERC‑6492 for passkey/AA wallets to sidestep those annoying "it works in staging but not in production" scenarios. (eips.ethereum.org)
• ReCaps for Least-Privilege Authorization and Better UX:
  • Implement a single SIWE prompt to provide narrow, time-limited permissions. WalletConnect One‑Click Auth can help you with this approach. (eips.ethereum.org)
• CI for Messages:
  • Lint your SIWE using the official validator. Treat the formatting and field compliance as a build gate to keep everything tidy. (docs.siwe.xyz)
• Cookie and CSRF Hygiene:
  • Use HttpOnly + Secure + SameSite; for admin, prefer SameSite=Strict. Also, don’t forget to include CSRF tokens for any state-changing endpoints. (owasp.org)

GTM What We Measure and Report in Your Pilot

• Authentication Conversion: We're looking at the journey from wallet connect to verified SIWE signature, and we’ll break it down by EOA, ERC‑1271, and ERC‑6492.
• Time-to-Auth: We’ll track how long it takes, measuring both the median and the 95th percentile from the moment you connect until the session is established.
• Support Burden: We’ll keep an eye on wallet-specific error rates, like “Unknown domain” or origin-mismatch flags popping up from hardware wallets. Plus, we’ll make note of any counterfactual failures that we quarantine and retry.
• Security Quality: This is all about keeping things safe. We’ll look at how often we detect replay attempts, check cookie misconfiguration findings from DAST/SAST, and review results from incident drills.
• Channel Uplift: For those using WalletConnect One-Click Auth, we’ll track the success of multi-device deep links and compare it to the drop-off rates seen with QR flows. WalletConnect’s goal of reducing drop-offs and pushing One-Click Auth helps us set our KPI targets. (walletconnect.network)

Why 7Block Labs

• We turn your specs into practical deployment checklists that not only breeze through security reviews on the first try but also stay on schedule.
• We handle the sometimes tedious but essential details--think EIP‑4361 compliance, ERC‑1271/6492 fallbacks, WalletConnect pairing, OIDC federation, and cookie security--so your team can focus on rolling out cool new features.
• If you’re looking for extra functionality, we’ve got you covered with our audited contracts and integrations. Check out our offerings in smart contract development, cross‑chain solutions, and dapp development.

Procurement-Friendly Scope (SOC2, Budget, and Ownership)

• Clear SoW: We’re looking at a few options here: the SIWE MVP, which focuses on authentication only; SIWE combined with ReCaps for authorization; or SIWE integrated with an OIDC bridge.
• Compliance Mapping: Let’s make sure we cover the SOC2 CC6.x and CC7.x controls, which will involve tracking log fields, setting up retention policies, and conducting access reviews.
• Cost Control: The cool thing about SIWE is that it’s off-chain, which means zero gas fees for logins! WalletConnect is an open-source client that has hosted relay options. Plus, OIDC can either run on your own infrastructure or be set up as a managed module. Check it out here: (eips.ethereum.org).
• Handover: We’ll want to prepare runbooks for wallet support, incident response, and the promotion of releases, which includes staging wallets, test vectors, and message lints.

Quick Checklist for This Sprint

• Add an ABNF-compliant SIWE builder and set up a server-side validator.
• Implement verification triage: EOA → ERC-6492 → ERC-1271.
• Introduce a Redis-backed nonce store that features TTL and guarantees single-use.
• Strengthen sessions with __Host‑ cookies, Secure/HttpOnly/SameSite flags, a 30-minute idle timeout, and rotation on elevation. (owasp.org)
• Add WalletConnect v2 pairing along with One-Click Auth in QA.
• If SSO is necessary, set up SIWE OIDC and register with either Okta or Auth0. (docs.login.xyz)
• Connect audit logs to the SIEM with contract-wallet markers and capability URNs.

Looking for someone to help you ship on a tight schedule with security sign-off?

• Kick things off with our 90-day SIWE Pilot, which covers everything from architecture and implementation to security hardening and KPI reporting.
• Once you're ready for production, we can extend our support with our security audit services, web3 development services, and blockchain integration.

Book a 90-Day Pilot Strategy Call

Ready to dive in? Schedule your 90-Day Pilot Strategy Call with us! We’re excited to chat about your goals and lay out a game plan to make things happen.