BigchainDB - Ethereum Integration

The code in this repository implements BEP-15 (Ethereum Integration Tools & Demo 1). For more details on what is being done here, please read the mentioned BEP first.

This repository contains three proofs of concepts:

PoC 1 (public Ethereum with Oraclize)

POC1 tries to showcase an approach, using which we can leverage the decentralized data storage capability of BigchainDB and decentralized logic execution (smart contracts) of ethereum.

PoC 1 flow

POC1 queries and fetches the data stored in BigchainDB when a smart contract function is invoked (or a condition is met) using the oraclize service.

On successfully retrieval of data using oraclize, the smart contract evaluates and executes the logic and performs the requested operation.

Directory contents

• Data generation functions for BigchainDB in /bdb
• Payment initiation in Ethereum smart contract using infura network in /oracle/src/index.js
• Ethereum contracts are in /oracle/contracts

PoC 2 (private Ethereum with custom service)

This proof of concept creates ERC20 token on Ethereum network and listens for token transfers. All token transfers are replicated on BigchainDB as divisible asset transfers.

PoC 2 flow

• Ethereum and BigchainDB get ERC20 token and Divisible asset minted
• Service listens to Ethereum network for our ERC20 token transfers
• On ERC20 token transfer the divisible asset on BigchainDB is transferred accordingly.

Directory contents

• ERC20 token contract in /contracts
• Listener in nodejs that transfers divisible assets in /src/eth.js

PoC 3 (private Ethereum with Stargate)

Third proof of concept is similar to POC 1 but it uses a slightly complex query and smart contract. It also uses a private Ethereum network and the integration between Ethereum and BigchainDB is done using the Stargate tool from Oraclize.

PoC 3 flow

• Create scans as assets on BigchainDB with timestamp
• Execute smart contract that uses query-engine to retrieve number of transaction for a particular output (public key).
• If number of transactions is greater then predefined amount then ether is transferred to the recipient.

Directory contents

• Query-engine service which can be used to query MongoDB of BigchainDB in /query-engine
• Ethereum contract on /eth

More Details

More details about each of these proofs of concepts can be found in the README.md files in their respective directories.