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Knowledge Base
Tag: signature

Tagged: signature

3

Cryptography

Ed25519 Signatures How Truestamp uses Ed25519 to sign the 32-byte domain-separated hashes of items, blocks, entropy observations, and proof bundles, what a signature proves to a verifier, and how to fetch and pin the public signing keyring (key ids, rotation lineage) from /.well-known/keyring.json.

Glossary

Ed25519 signature The deterministic 64-byte elliptic-curve signature scheme Truestamp uses to sign the 32-byte domain-separated SHA-256 hashes of items, blocks, entropy observations, and proof bundle payloads, proving Truestamp's signing key endorsed exactly that object. Signing-key ID (kid) The 4-byte identifier of an Ed25519 signing key, SHA-256 of the 0x51 byte prefix plus the public key truncated to 4 bytes and written as 8 hex characters; recorded on items, blocks, entropy observations, and proof bundles so a verifier knows which key signed what.

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