FTB-C000734 / Evidence concept

Digital signature

A digital signature lets a verifier check that specified bytes were signed using the private key corresponding to a verification key.

Also known ascryptographic signature

Advanced 3 linked topicsEvidence-reviewed

Definitions

In plain terms

Verification detects a changed message or a signature that does not match the selected key and algorithm.

Technical

D30 uses a pinned Ed25519 profile over exact checkpoint bytes and separately checks scoped key authorization.

Scope

The primitive alone does not identify a person, establish freshness or prove the signed claims true.

Examples

  • Changing one synthetic checkpoint byte makes verification fail under the originally authorized public key.

Common misconceptions

  • A valid signature does not mean an authorized signer supplied complete financial evidence.

Concept relationships

Related

Required by

Where this concept is used

Evidence and governance

  1. RFC 8032: Edwards-Curve Digital Signature Algorithm IRTF Crypto Forum Research Group · official standard

    Supports: preferred label, short definition, variant distinction

    Limits: Not an authorization, key lifecycle, freshness, financial truth or real-world identity policy.

  2. D30 glossary teaching-profile scope, Batch 013 The Fintech Builder · internal governed contract

    Supports: technical definition

    Limits: No independent regulatory mandate, real-bank dataset, service execution, external witness or production assurance is claimed.

Reviewed by
fintech-builder-batch-013
Last reviewed
2026-10-27
Next review
2027-10-27
Record status
evidence reviewed

This record is evidence-reviewed and readable, but not yet promoted to published — it is served noindex,follow and excluded from the sitemap.

Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.