Introduction

The correctness of the data is a crucial part of decentralized applications (dApps) that rely on data from the real world. Manipulated data can impact the security and the objective of the applications.

The cw-band introduces a standard for anyone looking to integrate data from Band's oracle into their CosmWasm smart contract on a Cosmos-SDK-based blockchain through Inter-Blockchain Communication (IBC). The standard itself consists of data types that require for requesting and receiving data.

Workflow

At a high level, the workflow will be as follows. First, the smart contract creates an IBC packet to request data from BandChain. Then, relayers will pick up the IBC packet and relay it on BandChain.

After BandChain processes the request, it will send an acknowledgement message along with request_id back. And, when the result of the request is finalized, BandChain will send a new IBC packet that contains the final data back. Relayers will listen and pick up those packets and relay them to the smart contract.

At this point, the smart contract can use the data from BandChain in its smart contract securely. If the smart contract wants to have new or more data, it can always send a new IBC packet and start the process again at any time.