Signature technologies allow users to prove control of a private key and therefore prove that the holder of a key agreed to something. They’ve traditionally been used for identity authentication and contract signing. But new threshold-based signature schemes such as FROST (and sometimes MuSig) go further and allow for thresholds of groups to make decisions, while Provenance Marks using sigantures to prove ordering.
Why? _Obviously, being able to prove control of keys and identity is important. MuSig and FROST also offer much stronger security because they can sign for keys that don’t currently exist in a single form (making them less prone to compromise, while the use of thresholds also makes them less prone to loss).
FROST
Threshold Signature. FROST is a threshold signature system whose keys can be created by Distributed Key Generation that supports increased privacy due to its signature aggregation power.
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MuSig2
Multi-Signature. Musig is a multisig system that can be used for threshold signing with certain additional tools. Like FROST its signatures are aggregatable, but it offers stronger ability to prove who signed (at the cost of privacy).
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Provenance Mark
Hash Chain. Provenance marks are a cryptographic system used to link digital objects, so that it can be proven that one followed another and (if desired) that there are no gaps.
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