> For the complete documentation index, see [llms.txt](https://docs.teranode.group/tng-identity-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.teranode.group/tng-identity-documentation/self-sovereign-identity-knowledge/some-of-the-critical-components-of-decentralise-id/a-blockchain-tailored-for-decentralized-identity.md). # A Blockchain Tailored for Decentralized Identity The public blockchain ensures that credentials remain verifiable at any time without contacting the credential issuer. The Platform simplifies the creation of Verifiable Credentials, making cryptography or blockchain knowledge unnecessary. ### **A Verifiable Data Registry** The public blockchain is an immutable registry containing all credential issuers' Decentralized Identifiers (DIDs). When verifying a credential, a Verifier will look up the Issuer's DID to confirm if it was the Issuer who signed it. This process is fully automated and seamless when using the Platform. #### **What goes on-chain?** * Issuers' Decentralized Identifiers (DIDs) and associated Public Keys * Credential Schemas * Revocation Registries **What does NOT go on-chain?** * Personally identifiable information * Verifiable Credentials. Credentials are stored on the user's devices (e.g., their Wallets) * Permissionless and Proof-of-Work The Substrate-based public blockchain, utilizing Proof-of-Work, is scalable, resilient, and environmentally friendly. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.teranode.group/tng-identity-documentation/self-sovereign-identity-knowledge/some-of-the-critical-components-of-decentralise-id/a-blockchain-tailored-for-decentralized-identity.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.