Price Oracles + Signed Messages On Off Chain
summary
Demo shows replacing on-chain price aggregation with signed messages (eth_sign) where prices are converted to uint256, sorted and medianed off chain, then submitted with 65-byte signatures and verified on-chain via ecrecover. Proof-of-concept uses three demo oracles (demo median worked) and cites production use with 14 whitelisted oracles. Claims: big gas savings, no node balance needed, and relaying via Scarl or third parties to publish bundles that smart contracts accept.
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chapters (11)
- 0:00Price oracles + signed messages
- 1:02What is an oracle
- 2:39Naive oracle drawbacks
- 4:26Traditional oracle challenges
- 5:28Signed messages advantages
- 6:32Live signed message demo
- 7:56How signed messages work
- 8:40Simplified medianizer
- 10:06Production security
- 10:48Other signed message uses
- 11:53DAI improvements
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