> For the complete documentation index, see [llms.txt](https://docs.hypersign.id/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hypersign.id/core-concepts.md).

# Core Concepts

- [Introduction](https://docs.hypersign.id/core-concepts/introduction.md): Self Sovereign Identity (SSI)
- [Decentralized Identifier (DID)](https://docs.hypersign.id/core-concepts/decentralized-identifier-did.md)
- [DID Registry](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/did-registry.md)
- [Private and Public DID](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/private-and-public-did.md)
- [DID Authentication](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/did-authentication.md)
- [DID Communication (DIDComm)](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/did-communication-didcomm.md)
- [Adding multiple controller to DID](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/adding-multiple-controller-to-did.md): > TODO
- [Adding multiple verification methods](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/adding-multiple-verification-methods.md)
- [Verification Method vs Recovery Signature](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/verification-method-vs-recovery-signature.md)
- [Blockchain Account Id](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/blockchain-account-id.md): A specification to store wallet address of multiple chain on Hypersign DID
- [DID Threshold](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/did-threshold.md)
- [Verifiable Condition](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/verifiable-condition.md)
- [Verification Relationships](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/verification-relationships.md)
- [Authorization Capabilities (zCap)](https://docs.hypersign.id/core-concepts/decentralized-identifier-did/verification-relationships/authorization-capabilities-zcap.md)
- [Schema](https://docs.hypersign.id/core-concepts/schema.md)
- [Schema Registry](https://docs.hypersign.id/core-concepts/schema/schema-registry.md)
- [Schema.org](https://docs.hypersign.id/core-concepts/schema/schema.org.md)
- [Verifiable Credential (VC)](https://docs.hypersign.id/core-concepts/verifiable-credential-vc.md)
- [Credential Revocation Registry](https://docs.hypersign.id/core-concepts/verifiable-credential-vc/credential-revocation-registry.md)
- [Issuing a Credential to Multiple Subjects](https://docs.hypersign.id/core-concepts/verifiable-credential-vc/issuing-a-credential-to-multiple-subjects.md)
- [Bearer Credential](https://docs.hypersign.id/core-concepts/verifiable-credential-vc/bearer-credential.md)
- [Single-Use Credential](https://docs.hypersign.id/core-concepts/verifiable-credential-vc/single-use-credential.md)
- [Verifiable Presentation (VP)](https://docs.hypersign.id/core-concepts/verifiable-presentation-vp.md)
- [Specifications](https://docs.hypersign.id/core-concepts/specifications.md)
- [Supported Signature Algorithms](https://docs.hypersign.id/core-concepts/specifications/supported-signature-algorithms.md)
- [Client Specification](https://docs.hypersign.id/core-concepts/specifications/client-specification.md): Supported Message Signature Specifications on Hypersign Network
- [EVM based chains](https://docs.hypersign.id/core-concepts/specifications/client-specification/evm-based-chains.md)
- [Cosmos based chains](https://docs.hypersign.id/core-concepts/specifications/client-specification/cosmos-based-chains.md)