FTB-C000732 / Evidence concept

Hash chain

A hash chain links each record commitment to the preceding commitment so a retained trusted head can bind an ordered history.

Also known ashash-chained journal

Advanced 4 linked topicsEvidence-reviewed

Definitions

In plain terms

Changing an earlier record changes later computed commitments when the selected bytes and linking rules are checked.

Technical

D30 hashes an explicitly encoded, scoped sequence; verification needs the expected head, complete selected prefix and unchanged byte rules.

Scope

A self-consistent replacement chain is possible if the attacker also replaces the only trusted head.

Examples

  • A synthetic one-byte journal edit fails comparison with the separately retained original chain head.

Common misconceptions

  • A valid local chain does not prove source completeness or legitimate transactions.

Concept relationships

Prerequisites

Related

Where this concept is used

Evidence and governance

  1. FIPS 180-4, Secure Hash Standard, August 2015 National Institute of Standards and Technology · official standard

    Supports: preferred label, short definition, variant distinction

    Limits: Does not specify the D30 chain encoding, trusted head, ledger completeness or authenticity; revision planning is noted by NIST.

  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.