Supply chain attacks leave a signal trail in credential intelligence before malicious code fires — usually days to weeks before breach day. The Polymarket incident ($2.9M, June 26) is a documented case study: compromised vendor → stolen CI/CD tokens → malicious JS injected to frontend → $2.9M drained while everything looked normal to users. We mapped each precursor signal and the monitoring layer that catches it: [https://relayshield.hashnode.dev/how-relayshield-would-have-caught-the-polymarket-attack-before-it-cost-2-9-million?utm_source=hashnode&utm_medium=feed] #threatintel #supplychain #defi #infosec #cybersecurity