This section is for Chrome extension developers who want to add Blinks to third party sites like Twitter. If you’re interested in Native blink support check out our React SDK or React Native SDK. Chrome extension showing Blinks integration on Twitter 
// contentScript.ts
import { setupTwitterObserver } from "@dialectlabs/blinks/ext/twitter";
import { ActionConfig, ActionContext } from "@dialectlabs/blinks";

// your RPC_URL is used to create a connection to confirm the transaction after action execution
setupTwitterObserver(new ActionConfig(RPC_URL, {
  signTransaction: async (tx: string, context: ActionContext) => { ... },
  signMessage(data: string | SignMessageData, context: ActionContext) { ... },
  connect: async (context: ActionContext) => { ... }
}))

// or

import { type ActionAdapter } from "@dialectlabs/blinks";

class MyActionAdapter implements ActionAdapter {
  get metadata() { ... }
  async signTransaction(tx: string, context: ActionContext) { ... }
  async connect(context: ActionContext) { ... }
  async confirmTransaction(sig: string, context: ActionContext) { ... }
  async signMessage(data: string | SignMessageData, context: ActionContext) { ... }
}

setupTwitterObserver(new MyActionAdapter());

​
Action Adapter & Multichain Compatibility

After implementation of sRFC 31, action developers can specify a target blockchain for an action by including metadata in responses. The action metadata is accessible within the ActionContext across ActionAdapter functions. Chrome extension developers can also specify supported blockchains by defining them within the ActionAdapter. Additionally, other functions can be implemented to handle the action’s blockchain based on the ActionContext. For backward compatibility, the absence of blockchain IDs should be interpreted by Blink clients as actions targeting the Solana mainnet. 
import {
  ActionAdapter,
  ActionAdapterMetadata,
  BlockchainIds,
  SignMessageData
} from '@dialectlabs/blinks';

class MyActionAdapter implements ActionAdapter {
  get metadata() {
    return {
      // the IDs are CAIP-2 compatible strings
      supportedBlockchainIds: [BlockchainIds.SOLANA_MAINNET, BlockchainIds.ETHEREUM_MAINNET],
    };
  }
  async signTransaction(tx: string, context: ActionContext) {
    const actionBlockchainIds = context.action.metadata.blockchainIds;
    if (
      !actionBlockchainIds ||
      actionBlockchainIds.includes(BlockchainIds.SOLANA_MAINNET)
    ) {
      // handle solana mainnet
      return;
    }
    if (actionBlockchainIds.includes(BlockchainIds.ETHEREUM_MAINNET)) {
      // handle ethereum mainnet
    }
  }
  async connect(context: ActionContext) { ... }
  async confirmTransaction(sig: string, context: ActionContext) { ... }
  async signMessage(data: string | SignMessageData, context: ActionContext) { ... }
}