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iExec dapp

written in python and ran within a docker image by an iExec TEE workerpool
calls coinbase oracle API for current BTC or ETH price
workerpool returns callback message on-chain of price and signature
signature verifies coinbase signed the message with their private key
coinbase API key is encrypted and secured by Intel SGX and SCONE

smart contract

task id of dapp result is returned via event after successful run
user/bot triggers smart contract with the task id
smart contract retrieves task result bytes on-chain
smart contract processes data (message and signature of btc price) from task
verifies message was signed by coinbase on-chain within the smart contract
verifies that price is newer than latest price by comparing timestamps
smart contract writes/updates latest price on-chain along with timestamp
smart contract returns current BTC or ETH price and timestamp from the signed coinbase message
contract functions based on Open Oracle format

iExec price feed using Coinbase Price Oracle Demo v1

https://gateway.pinata.cloud/ipfs/QmVGVy54T5XDg4tH2iZUpmnKoxNyoUaZUriNwZKGUNnFpD/

connects to doracle smart contract using a web3 wallet such as metamask or infura.io node
uses web3.js to query smart contract
all events in certain block range returned
reading the ethereum logs for events is faster than directly reading from smart contract
an array of price entries based on event data is created
d3.js is used to draw interactive chart and table displaying price

TO-DO

clean up js/html/css
add Open Oracle mainnet connectivity via a daemon
since prices are signed no trust is lost
rewrite readme