cryptol0g1c/web3-be-challenge

Cryptologic web3/backend application challenge.

The main goal of this challenge is to create a backend application writen in nodejs/typescript that consumes, processes and store blockchain data.

To achieve this, the following items are required.

• Create a fork of the current repository, once the challenge is done submit a proper PR.
• Instantiate a web3 o etherjs object with an public RPC (in this case we will use Avalanche EVM C-Chain)
• create a MongoDB database connection withing the runtime

Having this transaction as a starting point 0x508217c172c3cfe006ee9ca5bef621ba11a359461bacfc0494f1449a7d00f443 it is required to:

• Use web3.js or ethers.js proper methods to fetch transaction data details

• Fetch and save main contract ABI and bytecode and save them into a file and database

• Understand and parse the event log to show in a básic REST response the decoded events and its parameters

• Create a basic REST endpoint that once queried saves the parsed data into a MongoDB document.

• Create a basic REST endpoint to get the previously saved data.

Must have:

• Basic error handling
• Basic README file
• Basic explaination of the work done

Extra points:

• unit testing
• Docker build

References:

Event logs

Web3 doc

EthersJS dock

topics & getPastLogs