Alvara APIs

The CrossChain-BitcoinL2-Investment bot leverages several APIs and services to provide a rich user experience. Here’s a breakdown of the key integrations:

Telegram API

• Purpose: Handles user interactions, command processing, and messaging.

• Library Used: Telegraf, a framework for building Telegram bots.

• Endpoints:

  • /sendMessage: Sends text messages to users.

  • /sendPhoto: Sends images to users.

  • /answerCallbackQuery: Handles inline keyboard interactions.

Blockchain Interaction (Ethers.js)

• Purpose: Facilitates secure interactions with the Ethereum blockchain.

• Library Used: ethers.js, a JavaScript library for Ethereum.

• Usage:

  • JsonRpcProvider: Connects to the Ethereum network.

  • Contract Class: Interacts with BitcoinL2 smart contracts, enabling functions like contribute and withdraw.

  • Transaction Management: Sends and monitors blockchain transactions.

Backend Services (Express and Axios)

• Express Server: Hosts the bot's webhook and handles incoming requests.

• Axios: Used for HTTP requests, such as setting webhooks and fetching external data.

• Endpoints:

  • /webhook: Processes incoming messages from Telegram.

  • /setWebhook: Configures the bot’s webhook URL.

Security Considerations

• Encryption: Wallet keys and sensitive data are encrypted using crypto-js and the bot’s token.

• Secure Sessions: User sessions are managed securely within the bot’s context to prevent unauthorized access.