> For the complete documentation index, see [llms.txt](https://docs.zetrix.com/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zetrix.com/en/developer-resources/agentic-wallet/appendix/glossary.md).

# Glossary

| Term               | Meaning                                          |
| ------------------ | ------------------------------------------------ |
| **x401**           | Identity proof protocol (401 Proof-Required).    |
| **x402**           | Payment protocol (402 Payment Required).         |
| **VC / VP**        | Verifiable Credential / Verifiable Presentation. |
| **DID / ZID**      | Decentralised Identifier (Zetrix variant).       |
| **DCQL**           | The verifier's claim query language.             |
| **BBS+**           | Signature scheme enabling selective disclosure.  |
| **Bulletproof**    | Zero-knowledge range proof.                      |
| **Holder binding** | Ed25519 signature over the verifier nonce.       |
| **HSM**            | Hardware-grade key store.                        |
| **Facilitator**    | x402 settlement service.                         |
| **JMYR**           | A ZTP20 asset used for settlement.               |