# Technical Architecture

## Technical Architecture

These are the major components we use in our technical architecture:

* Smart Contracts:
  * Our solidity smart contracts are owned by a multi-sig wallet, use OpenZeppelin's upgradeable design pattern, and use of OpenZeppelin's Defender to perform the contract administration
  * The on-chain pricing uses [Chainlink](https://chain.link/) as our oracle
  * We use both off-line and online automation to automate many tasks, including auto-claiming all contracts at expiry, determining the time of channel breakout for Channel / Epoch, creating/starting Epochs, etc.
  * This will be open sourced at some point after our audits are complete
* Front End UI:
  * The front end is hosted at AWS and is written in ReactJS
  * It is globally cached at edge servers and made highly available using AWS CloudFront, which also protects it against various types of web DOS attacks
  * We have various AWS uptime monitors running against the front end
  * We use geo-fencing using AWS CloudFront's functionality to restrict production access
  * We check and restrict wallets on the OFAC restricted account lists
  * We use [Alchemy](https://www.alchemy.com/) RPCs to access the blockchain
  * Charts and financial information are provided by [TradingView](https://www.tradingview.com/), a popular trading and charting platform. Check out the gold chart or explore [bitcoin](https://www.tradingview.com/symbols/BTCUSD/) chart directly from their website.
  * This will not be open sourced
* Front end off-chain Price Indication Server:
  * In order to minimize direct load to get Chainlink prices for the front end, we implemented an off-chain price server on AWS that is accessible via REST web service calls with highly scalable AWS lambda functions as part of the AWS's API Gateway
  * The official pricing is done on-chain via Chainlink's oracles
  * This is not open sourced
* GraphQL:
  * We use [the Graph](https://thegraph.com/en/) as our database of on-chain events
  * Our schema and mapping code is not open sourced
* Partner Integration Services:
  * For our integration partners only, we offer REST API calls hosted on AWS and secured by individual API keys to get supported assets and offers to display
  * Making purchases and claims must be done directly to the smart contract by the integration partner in order to safeguard their private keys.
  * We provide example code to help with this process
  * Please contact us at [partners@bracket.fi ](mailto:partners@bracket.fi)to learn more


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