How Schemas Define Interoperability in Sign Protocol
In Sign Protocol, the core of the architecture is the Schema. It is a smart contract that defines the technical structure of an attestation: the types of data it must contain (string, uint, address, etc.) and how they are organized. Once created, the schema is registered on-chain and obtains a unique identifier. Any third-party application can automatically interpret the attestations created under that mold thanks to that registry.
The reuse of schemas is key. The same schema can serve multiple use cases—from identity credentials to participation proofs in voting—and developers can compose them to build more complex logics. The on-chain registry acts as a public catalog that ensures any DApp knows exactly what data to expect and how to validate it. The result is native interoperability: data flows between applications without the need for custom integrations or bilateral agreements, reducing friction and accelerating the development of services based on verifiable attestations.