What a wallet integration actually needs.
A wallet integration needs a defined action, supported networks and clear states for connection, authentication and transactions. Connecting an address is not the same as signing in, and submitting a transaction is not confirmation that it succeeded.
One address, several different states.
Illustrative example: an Ethereum application shows a public balance and a private customer area. Reading a balance, starting a session and verifying a payment are separate operations. A single connected indicator cannot stand in for all three.
| Observed event | What it establishes | What still needs checking |
|---|---|---|
| Address connected | The interface has an address to display or query. | Proof of control before creating a private session. |
| Sign-in message returned | A signature and message are available for verification. | Signature, expected message fields, nonce use and session validity. |
| Account changes | The wallet now exposes a different account. | Whether the existing session must end or be reauthenticated. |
| Transaction submitted | There is a transaction reference to follow. | The actual result and the product's confirmation policy before fulfilment. |
| User rejects the request | The requested action was not authorised by that interaction. | A clear recovery path without a false success or a forced repeat prompt. |
Start with the action, not the wallet button.
Does the product read public data, prove control of an address, check token ownership or request a transaction? Each action needs different permissions and failure handling. Write down the one the user is trying to complete.
Name the networks, deployed contracts and environments. A test network and a production network are different targets, even if the interface looks identical. The project scope should identify which combinations are supported.
Treat authentication as its own flow.
If the application needs a private session, it must verify proof of address control rather than trust an address supplied by the browser. Sign-In with Ethereum defines a structured message that includes context such as a domain, chain identifier and nonce.
A server must validate the message and signature against the intended session. Reuse, expiration and account changes need defined behaviour. The details depend on the chosen authentication approach; a generic connection library does not settle them for the product.
Give every transaction state a meaning.
The user can reject a request before anything is submitted. A submitted transaction can remain pending, fail or be replaced. The application needs to distinguish these outcomes and explain what can be done next.
Do not fulfil an order or grant a persistent entitlement solely because the browser reports a transaction hash. Define the confirmation and verification policy for the network and the business action. Keep enough information to reconcile the result after a tab is closed.
- Disconnected or unsupported wallet environment.
- Wrong network or changed account.
- User rejected the signature or transaction.
- Submitted and still pending.
- Confirmed under the agreed policy.
- Failed, replaced or no longer available from the provider.
Keep access checks where the data lives.
Token-gated interface elements are not a sufficient boundary for private resources. If access depends on a wallet, the system serving the protected data must check the relevant permission too.
Decide when access is rechecked and how account changes affect an existing session. Public chain data and private application data have different disclosure properties. The interface should not imply that wallet use makes the whole product private.
Separate interface work from contract review.
An interface can behave correctly while the underlying contract contains a flaw. Contract development, security review and the operation of privileged keys need explicit owners and scope.
BRÈCHE scopes Web3 work around the complete product flow. That includes how the user recovers from a rejected request and how an operator checks what actually happened, not only how the wallet is connected.
The checklist.
- The wallet action and supported networks are explicit.
- Authentication is separate from connection.
- Signatures and messages are validated for the intended session.
- Pending, failed and confirmed states are distinguishable.
- Protected data has server-side access checks.
- Contract review and key-management responsibilities are defined.
Sources.
Technical references checked on .