Revisited from the Foresaw archive. The argument and structure have been updated for this edition.
Blockchain is often introduced as a security technology. A more useful starting point is a coordination question: which parties need a shared record, and what prevents them from relying on a conventional system of record?
That question helps separate a legitimate architectural need from an unnecessary layer of complexity.
Identify the trust boundary
List the participants, what they are allowed to do, and who can change the rules. If one organization already has accepted authority over the record, a conventional database and audit trail may be easier to operate.
If multiple parties need to agree, define the specific disagreement or dependency the design must address.
Separate integrity from correctness
A record that is difficult to alter can still contain an incorrect input. The system needs a way to establish who submitted information, how it was verified, and how corrections are represented.
A ledger also does not remove application security, key management, permissions, or the need to protect information outside the ledger.
Consider the information lifecycle
Decide what information belongs in the shared record and what should remain elsewhere. Think through access changes, erroneous entries, operational recovery, and the long-term obligations associated with the data.
Compare the operating cost
Evaluate the full solution against alternatives: a shared database, signed records, an append-only log, or an existing integration. Include governance and participant onboarding, not just transaction execution.
The best architecture is the one that solves the actual trust problem with an operating model the participants can sustain.
Adapted from “Blockchain Technology: Revolutionizing Data Security in the IT Industry.”
First published on Foresaw. Reworked for this edition.