What Are “Threshold Signatures” and How Are They Used in Oracle Reporting?

Threshold signatures, like those used in schemes such as BLS, allow a group of signers (oracle nodes) to collectively produce a single, valid signature only if a minimum "threshold" number of signers participate. This is used to prove that a consensus price has been reached by a sufficient number of decentralized nodes before the data is submitted on-chain, thereby cryptographically securing the aggregation process.