How to Use Dynamic for Tezos Auth

Introduction

Dynamic delivers a plug‑and‑play authentication module for Tezos wallets and decentralized applications. It abstracts the cryptographic signing flow, letting developers add secure login in a few lines of code. The module works with the Tezos RPC interface and supports popular libraries such as Taquito. By integrating Dynamic, teams reduce the attack surface and accelerate time‑to‑market for Tezos‑based products.

Key Takeaways

• Dynamic replaces custom signing logic with a standardized, audited authentication flow.
• It supports both interactive (user‑prompted) and programmatic (API‑level) authentication.
• The module is lightweight, adding less than 15 KB to the client bundle.
• It provides built‑in replay protection and nonce management.
• Integration requires no changes to the Tezos network protocol.

What Is Dynamic

Dynamic is an open‑source authentication SDK that wraps Tezos’s operation signing process. It exposes a high‑level API that handles key derivation, message encoding, and signature verification. The SDK is available for JavaScript/TypeScript, Python, and Rust, matching the ecosystems most Tezos developers use. Documentation on GitHub details each method and its parameters.

You can think of Dynamic as the “auth layer” that sits between a user’s wallet and your application logic, similar to how OAuth libraries handle token exchange in web services.

Why Dynamic Matters

Secure authentication is a critical bottleneck for Tezos dApp adoption. Manual signing implementations often introduce vulnerabilities such as replay attacks or key leakage. Dynamic enforces best‑practice patterns from the start, reducing the chance of security incidents. By leveraging an audited library, teams also gain compliance benefits for financial or regulated services.

Moreover, Dynamic accelerates development cycles: developers embed a few API calls instead of writing and testing cryptographic code from scratch. This speed matters in fast‑moving markets where time‑to‑market determines success.

How Dynamic Works

Dynamic’s authentication flow follows a concise, three‑step model:

1. Request Creation: The client builds an auth payload using Dynamic.createPayload(address, nonce). This generates a Base64‑encoded string that includes the user’s public key hash and a timestamp.
2. Signing: The payload is sent to the user’s wallet (e.g., Temple, Kukai) via the Tezos RPC POST /injection/operation. The wallet signs the payload and returns the signed operation.
3. Verification: Dynamic verifies the signature with Dynamic.verify(payload, signature, publicKeyHash). If valid, it returns a JWT‑style token that the dApp uses for session management.

The core verification can be expressed as the formula:

isValid = verify(signature, sha256(payload), publicKey)

Dynamic also manages a rolling nonce store to prevent replay attacks. Each nonce is a monotonically increasing integer, hashed with the payload before signing.

Used in Practice

A typical integration looks like this (JavaScript example):

import { Dynamic } from '@dynamic‑sdk/tezos';

const dynamic = new Dynamic({ network: 'mainnet' });

// 1. Create auth payload
const payload = dynamic.createPayload('tz1...', Date.now());

// 2. Send to wallet and obtain signature
const signature = await templeWallet.sign(payload);

// 3. Verify and obtain session token
const token = await dynamic.verify(payload, signature, 'tz1...');
console.log('Authenticated:', token);

This pattern works for both web front‑ends and Node.js back‑ends. For mobile, the SDK provides a React‑Native bridge that uses the same API surface.

Developers can also embed Dynamic into a backend service to authenticate API calls: the server validates the JWT token generated after verification, ensuring only authorized users access protected endpoints.

Risks / Limitations

Dynamic mitigates many common flaws, but it does not eliminate all risk. Key points to consider:

• Wallet Dependency: If a wallet provider supports only a limited signing algorithm, Dynamic may fall back to less secure modes.
• Nonce Management: Distributed systems must sync the nonce store; unsynchronized clocks can cause transient rejections.
• Payload Tampering: The SDK assumes the transport layer is secure; using plain HTTP without TLS can expose payloads to interception.
• Regulatory Changes: Future Tezos protocol upgrades might alter signing semantics, requiring SDK updates.

Dynamic vs. Other Solutions

Two common alternatives are “static key authentication” (manually handling private keys) and “Tezos native RPC authentication” (using the built‑in authorize endpoint).

• Dynamic vs. Static Key: Static key requires developers to store and protect raw private keys, increasing exposure to theft. Dynamic never touches private keys; it delegates signing to the wallet, reducing attack surface.
• Dynamic vs. Native RPC Auth: The native RPC method is low‑level, exposing raw operations and demanding custom replay‑protection logic. Dynamic abstracts these details, providing a higher‑level token after verification, which simplifies session handling.

What to Watch

When adopting Dynamic, keep an eye on the following:

• SDK Updates: The maintainers release monthly patches that address new Tezos protocol features.
• Wallet Compatibility: Test the SDK with the most popular wallets in the Tezos ecosystem (Temple, Kukai, Umami) to ensure consistent behavior.
• Performance Benchmarks: Verify that the added verification step does not introduce noticeable latency in high‑throughput applications.
• Regulatory Guidance: Monitor updates from bodies such as the BIS for evolving standards on digital identity and authentication.

FAQ

Does Dynamic support multi‑signature (multi‑sig) accounts?

Yes. The SDK provides a createMultiSigPayload method that aggregates signatures from multiple keys before verification.

Can I use Dynamic on the Tezos Ghostnet testnet?

Absolutely. Pass network: 'ghostnet' in the constructor; the SDK routes requests to the testnet RPC endpoints.

What happens if a user denies the signing request?

Dynamic returns an error object with code USER_DENIED. Your application should catch this and prompt the user to retry or select a different wallet.

Is Dynamic compliant with GDPR?

Dynamic does not store personal data. All authentication data remains on the client side; the server only receives a stateless JWT after verification.

How does Dynamic handle key rotation?

Key rotation is handled by updating the public key hash in your user database. Dynamic can verify signatures against both the old and new keys during a grace period, allowing seamless transitions.

Can I integrate Dynamic with existing OAuth flows?

Yes. Use Dynamic to generate the Tezos‑specific token, then exchange it for an OAuth2 bearer token on your backend if your platform requires a unified identity layer.

Does the SDK provide any logging or monitoring?

Dynamic includes an optional logger interface that emits events for every payload creation, signature, and verification step. You can plug in your preferred observability tool.

Where can I find the source code and community support?

The repository is on GitHub at Dynamic SDK for Tezos. Community discussions occur on the Tezos developer Discord and the #dynamic-auth channel.