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BandChain - Decentralized Data Delivery Network

Documentation »

Whitepaper · Technical Specifications · Developer Documentation · Client Library


What is BandChain?

BandChain is a cross-chain data oracle platform that aggregates and connects real-world data and APIs to smart contracts. It is designed to be compatible with most smart contract and blockchain development frameworks. It does the heavy lifting jobs of pulling data from external sources, aggregating them, and packaging them into the format that’s easy to use and verified efficiently across multiple blockchains.

Band's flexible oracle design allows developers to query any data including real-world events, sports, weather, random numbers and more. Developers can create custom-made oracles using WebAssembly to connect smart contracts with traditional web APIs within minutes.

Installation

Building from source

We recommend the following for running a BandChain Validator:

  • 2 or more CPU cores
  • 8 GB of RAM (16 GB in case on participate in mainnet upgrade)
  • At least 100GB of disk storage

Step 1. Install Golang

Go v1.16+ or higher is required for BandChain.

If you haven't already, install Golang by following the official docs. Make sure that your GOPATH and GOBIN environment variables are properly set up.

Step 2. Get BandChain source code

Use git to retrieve BandChain from the official repo, and checkout the master branch, which contains the latest stable release. That should install the bandd binary.

git clone https://github.com/bandprotocol/chain
cd chain && git checkout v2.3.0
make install

Step 3. Verify your installation

Using bandd version command to verify that your bandd has been build successfully.

bandd version --long
name: bandchain
server_name: bandd
version: 2.3.0
commit: 4fe19638b33043eed4dec9861cda40962fb5b2a7
build_tags: ledger
go: go version go1.16.7 darwin/amd64
build_deps:
...

Setting Up Yoda — The Oracle Daemon

BandChain validators are also responsible for responding to oracle data requests. Whenever someone submits a request message to BandChain, the chain will autonomously choose a subset of active oracle validators to perform the data query.

The validators are chosen submit a report message to BandChain within a given timeframe as specified by a chain parameter (100 blocks in mainnet). We provide a program called yoda to do this task for you. For more information on the data request process, please see here.

Yoda uses an external executor to resolve requests to data sources. Currently, it supports AWS Lambda and Google Cloud Function (through the REST interface). In future releases, yoda will support more executors and allow you to specify multiple executors to add redundancy.

You also need to set up yoda and activate oracle status. Here’s the documentation to get started.

That’s it! You can verify that your validator is now an oracle provider via cli by using bandd query oracle validator <your validator address>. Your yoda process must be responding to oracle requests assigned to your node. If the process misses a request, your oracle provider status will automatically get deactivated and you must send MsgActivate to activate again after a 10-minute waiting period and make sure that yoda is up.

Resources

Community

License & Contributing

BandChain is licensed under the terms of the GPL 3.0 License unless otherwise specified in the LICENSE file at module's root.

We highly encourage participation from the community to help with D3N development. If you are interested in developing with D3N or have suggestion for protocol improvements, please open an issue, submit a pull request, or drop as a line.