In an era where digital identity and online security are paramount, Sign-In with Ethereum (SIWE) is redefining how users authenticate across decentralized platforms. By leveraging blockchain-powered identity verification, SIWE eliminates the need for traditional usernames and passwords, replacing them with secure, user-controlled wallet-based authentication. This innovative approach not only enhances security but also empowers users with greater control over their personal data and digital footprint.
Whether you're interacting with financial dApps, NFT marketplaces, or identity-verified services, SIWE offers a seamless and trustless way to log in — all through your Ethereum-compatible wallet. In this guide, we’ll explore how SIWE works, what permissions you grant when authorizing access, and why it’s becoming a cornerstone of decentralized identity.
What Is Sign-In with Ethereum (SIWE)?
Sign-In with Ethereum (SIWE) is a decentralized authentication standard that allows users to log in to third-party applications using their cryptocurrency wallet. Built on the EIP-4361 specification, SIWE enables secure, non-custodial identity verification without relying on centralized login providers like Google or Facebook.
Instead of creating yet another password, users sign a cryptographic message from the app using their private key — proving ownership of their wallet without exposing sensitive credentials. Once signed, the app can request limited access to user data — always with explicit user consent.
👉 Discover how blockchain authentication is transforming digital identity today.
What Happens When You Authorize Access?
When you choose to sign in with your Ethereum wallet, the app may request specific permissions to interact with your Monerium account or other integrated services. Before signing, it’s crucial to review the app’s terms of service, privacy policy, and the exact scope of access being requested.
By approving the SIWE message, you authorize the application to perform the following actions:
1. Read Your Profile Details
The app gains access to basic profile information linked to your wallet, such as your verified name and associated identifiers. This allows for a personalized experience — for example, displaying your real name in a financial dashboard or syncing your identity across platforms.
2. Read Your Payment Details
With your consent, the app can view your transaction history and payment records. This functionality is particularly useful for budgeting tools, tax calculators, or financial analytics platforms that help you understand your spending patterns and asset movements.
3. Read Your IBAN Details
If your wallet is connected to a regulated euro account via Monerium, the app can access your IBAN information. This enables seamless integration with banking services, allowing you to track balances, verify ownership, or even transfer your IBAN to another wallet address securely.
4. Trigger Outgoing Payments
Perhaps the most powerful — and sensitive — permission is the ability to initiate outgoing payments. However, this does not mean automatic withdrawals. Every transaction requires your explicit approval. You will always be prompted to sign each payment individually, ensuring you retain full control over your funds at all times.
This layered consent model aligns with core principles of self-sovereign identity and user autonomy, making SIWE one of the most secure and transparent authentication methods available today.
How Does SIWE Work? A Step-by-Step Breakdown
The SIWE process follows a standardized flow based on EIP-4361, ensuring consistency and security across implementations. Here’s how it works behind the scenes:
- You click “Sign In with Ethereum” on a supported app.
- The app generates a structured message requesting access.
- Your wallet displays the message for review and approval.
- You sign the message using your private key.
- The app receives a verification code and gains access to your data — within the limits you approved.
Here’s an example of what a typical SIWE message looks like:
example.com wants you to sign in with your Ethereum account:
0x5DA1EFC8dB7E32614d7ffb0B8b6bd86e85Ecc743
Allow AppName to access my data on Monerium
URI: https://example.com/callback
Version: 1
Chain ID: 100
Nonce: 8YOaY6qkvyf7F5lx
Issued At: 2024-08-22T10:00:00Z
Expiration Time: 2024-08-22T10:05:00Z
Resources:
- https://monerium.com/siwe
- https://example.com/privacy-policy
- https://example.com/terms-of-serviceKey Elements of the SIWE Message
Understanding each component helps you make informed decisions before signing:
- Domain (
example.com): The website or app requesting access. Always verify this matches the site you're on. - App Name (
AppName): The name of the application seeking permission. - Wallet Address: Your public Ethereum address used for signing.
- Callback URL: Where the app receives your signed consent.
- Version: Always set to
1under EIP-4361. - Chain ID: Specifies the blockchain network (e.g.,
1for Ethereum,100for Gnosis). - Nonce: A one-time random string preventing replay attacks.
- Issued At & Expiration Time: Timestamps defining when the request was created and when it expires (usually 5 minutes).
- Resource URLs: Links to relevant policies and documentation for transparency.
Once signed, the app uses the returned code to securely access only the data you’ve permitted — nothing more.
👉 Learn how secure wallet-based login protects your online identity.
Frequently Asked Questions (FAQ)
What is EIP-4361?
EIP-4361 is the official Ethereum Improvement Proposal that defines the standard for "Sign-In with Ethereum." It outlines the message format, security requirements, and interoperability rules to ensure consistent and secure authentication across platforms.
Can apps steal my funds if I sign a SIWE message?
No. Signing a SIWE message does not give apps access to your private keys or allow them to withdraw funds automatically. Even if an app has permission to trigger payments, each transaction requires your separate approval via wallet signature.
Is my personal data safe when using SIWE?
Yes. SIWE follows strict privacy-by-design principles. Apps only receive data you explicitly authorize, and all requests are time-limited and tied to specific domains. Additionally, resource links to privacy policies ensure transparency before consent.
Do I need a specific wallet to use SIWE?
Most Ethereum-compatible wallets support SIWE, including MetaMask, WalletConnect-enabled apps, Ledger Live, and others. As long as your wallet can sign structured messages, you can use SIWE.
Can I revoke access after signing?
Yes. You can typically manage or revoke connected app permissions directly through the service provider (like Monerium) or by clearing session data in your wallet interface.
Which blockchains support SIWE?
While originally designed for Ethereum, SIWE works across any EVM-compatible chain. The Chain ID field in the message specifies which network you're authorizing — including Polygon (137), Gnosis (100), Arbitrum, Optimism, and more.
Why SIWE Matters for the Future of Digital Identity
As web3 evolves, so does the need for secure, portable, and user-owned identities. SIWE represents a major leap forward by turning cryptocurrency wallets into universal identity tools. No longer must users juggle dozens of passwords or trust opaque login providers.
Instead, SIWE puts you in control — giving you visibility into who accesses your data, for how long, and under what conditions. It’s a foundational step toward decentralized identity (DID) systems that prioritize privacy, security, and interoperability.
For developers, integrating SIWE means offering users a frictionless yet secure login experience. For end users, it means fewer phishing risks, no password resets, and full transparency over data sharing.
👉 See how next-generation authentication is shaping the future of web3.
Final Thoughts
Sign-In with Ethereum (SIWE) is more than just a login method — it’s a paradigm shift in digital identity. By combining cryptographic proof with user-centric design, SIWE delivers a secure, transparent, and efficient way to interact with decentralized applications.
Whether you're managing fiat balances via IBAN-linked wallets or exploring DeFi platforms, understanding what you're authorizing is key. Always review the domain, expiration time, and requested permissions before signing any message.
With growing adoption across wallets, dApps, and financial services, SIWE is paving the way for a safer, more user-empowered internet — one signature at a time.
Core Keywords: Sign-In with Ethereum, SIWE authentication, EIP-4361 standard, decentralized identity, wallet-based login, blockchain authentication, user data permissions