How Chainlink Proof of Reserve Could Have Flagged TerraUSD's Collapse Early

TerraUSD (UST) collapsed with $18 billion in circulation due to circular collateral backing — UST relied on LUNA, which itself depended on UST demand, with no independent on-chain verification in place. When the peg broke, protocols continued accepting UST as collateral and processing loans against a rapidly depreciating asset because no automated circuit breaker existed. Chainlink's Proof of Reserve (PoR) is designed to address this gap by using a decentralized oracle network to continuously monitor and publish collateral data on-chain, replacing periodic audits with real-time verification. PoR can detect issues such as fractional reserve practices, infinite mint attacks via compromised bridges, and cross-chain collateral opacity that smart contracts cannot natively observe. However, PoR has limits — it verifies what node operators observed from a custodian's system at the time of the last update, meaning it cannot independently confirm the honesty of the custodian's own data reporting.