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+---
+caip: 341
+title: Extension ID Target Type Specification
+author: Alex Donesky (@adonesky1), Jiexi Luan (@jiexi), Joao Tavares (@ffmcgee725)
+discussions-to: https://github.com/ChainAgnostic/CAIPs/issues/341
+status: Draft
+type: Standard
+created: 2024-12-12
+requires: 294
+---
+
+## Simple Summary
+
+CAIP-341 defines the Extension ID type as a valid target type for establishing connections with browser extension wallets via the [CAIP-294] `wallet_announce` wallet discovery event.
+
+## Abstract
+
+This proposal introduces a new target type, Extension ID, for the `target` field of the `WalletData` interface dispatched in [CAIP-294]'s `wallet_announce` event.
+This target type is used to specify the extension ID of a browser extension wallet, allowing callers to establish connections with the wallet using the [`externally_connectable`][externally_connectable API documentation] API.
+
+## Motivation
+
+CAIP-294 proposes a solution to fragmentation across blockchain ecosystems wallet discovery mechanisms (e.g  Ethereum's [EIP-6963], Solana's [Wallet Standard]). By defining a standardized target type for browser extension wallets that use the `externally_connectable` browser API, we aim to extend CAIP-294's unified solution to cross ecosystem wallet discoverability, enhancing interoperability across these different blockchain ecosystems.
+
+## Specification
+
+The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in [RFC-2119](https://www.rfc-editor.org/rfc/rfc2119).
+
+### Definitions
+
+Wallet Provider: A user agent that manages accounts and facilitates transactions with a blockchain.
+
+Decentralized Application (dapp): A web page that relies upon one or many Web3 platform APIs which are exposed to the web page via the Wallet.
+
+Blockchain Library: A library or piece of software that assists a dapp to interact with a blockchain and interface with the Wallet.
+
+### Target Type
+
+The `target` field in the `WalletData` interface is used to specify the connection method for the wallet. This CAIP introduces the Extension ID type as a valid target type.
+
+This field MAY be included in the `WalletData` object defined in [CAIP294].
+If included, the property `target` SHOULD be an array of objects, containing Extension ID type used to connect to wallets using `externally_connectable`.
+An array was chosen for easier interoperability and flexibility for multiple CAIP target definitions.
+This specification defines entries in that array typed as `caip341`.
+
+```typescript
+interface WalletData {
+  // Required properties
+  uuid: string;
+  name: string;
+  icon: string;
+  rdns: string;
+  // Optional properties
+  target?: { type: string, value: any }[],
+  scopes?: Caip217AuthorizationScopes;
+}
+```
+
+### Usage
+
+The Extension ID target type is used to specify the extension ID of a browser extension wallet. This allows the dapp to establish a connection with the wallet using the `externally_connectable` API. The `externally_connectable` API documentation can be found [here](https://developer.chrome.com/docs/extensions/reference/manifest/externally-connectable).
+
+```ts
+const walletData = {
+  uuid: "350670db-19fa-4704-a166-e52e178b59d2",
+  name: "Example Wallet",
+  icon: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==",
+  rdns: "com.example.wallet",
+  target: [
+    {
+      type: "caip341",
+      value: "abcdefghijklmnopqrstuvwxyzabcdef"
+    },
+    {
+      type: "caip315",
+      value: true
+    },
+    {
+      type: "caip316",
+      value: {
+        somethingElse: "hello"
+      }
+    }
+  ],
+  scopes: {
+    "eip155:1": {
+      methods: ["eth_signTransaction", "eth_sendTransaction"],
+      notifications: ["accountsChanged", "chainChanged"]
+    }
+  }
+}
+```
+
+### Establishing Connection
+
+When the target type is `caip341` (i.e., Extension ID), the dapp MUST use the Extension ID to establish a connection with the wallet using the `externally_connectable` browser API, using the passed value to uniquely identify the extension.
+All subsequent communication with the wallet SHOULD be conducted over the `externally_connectable` API using `runtime.connect()` and `runtime.sendMessage()`.
+
+Example of establishing a connection and sending a message:
+
+```ts
+const extensionId = walletData.target.find((entry) => entry.type === 'caip341').value;
+const port = chrome.runtime.connect(extensionId);
+
+port.onMessage.addListener((message) => {
+  // Handle incoming messages
+});
+
+port.postMessage({
+  id: 1,
+  jsonrpc: "2.0",
+  method: "wallet_createSession",
+  params: {
+    // ... session parameters ...
+  }
+});
+```
+
+## Rationale
+
+By defining the Extension ID target type, we provide a standardized way for dapps to connect with browser extension wallets. This reduces complexity and enhances interoperability across different blockchain ecosystems. The use of the `externally_connectable` API ensures secure and efficient communication between the dapp and the wallet.
+
+## Backwards Compatibility
+
+This CAIP is fully compatible with existing standards and does not introduce any breaking changes. It extends the `WalletData` interface to include the `target` field, which is optional and does not affect existing implementations.
+
+## Links
+
+- [EIP-6963][eip-6963] - Ethereum's Multi Injected Provider Discovery
+- [CAIP-294][caip-294] - Browser Wallet Messaging for Extensions
+- [externally_connectable API documentation][externally_connectable API documentation] - Chrome's `externally_connectable` browser API documentation
+- [Wallet Standard][wallet standard] - Solana's Wallet Standard for discoverability
+
+[eip-6963]: https://eips.ethereum.org/EIPS/eip-6963
+[caip-294]: https://chainagnostic.org/CAIPs/caip-294
+[externally_connectable API documentation]: https://developer.chrome.com/docs/extensions/reference/manifest/externally-connectable
+[wallet standard]: https://github.com/anza-xyz/wallet-standard
+
+## Copyright
+Copyright and related rights waived via [CC0](../LICENSE).