GenAI FOMO has spurred businesses to light nearly $40B on fire

Consider two simple and common scenarios (there are more): citizenship certificates and the recognition of prior learning.

1. Citizenship – the person with the name of Joanna Doe in the birth certificate was issued with a citizenship certificate in the same name. As time goes by, Joanna Doe changes the legal name to Joanna Smith; the citizenship certificate is reissued with the new legal name. We do not want to truly update the existing record in the citizenship database and simply change Doe -> Smith as it will create a mismatch with the name in the birth certificate. If we use a ledger database, an update operation will create a new revision of the same record and all subsequent simple query operations will return the latest updated revision with the new name. The first revision, however, will still be retained in the table's cryptographically verifiable audit/history log.

Why should we care? Because Joanna Smith can accidentally throw their new citizenship certificate away and later they will want to renew their passport (or the driver's licence). The citizenship certificate may be restored[0] by presenting the birth certificate in the original name and the current or expired passport, but the passport is in the new name. From a random system's point of view, Joanna Doe and Joanna Smith are two distinct individuals with no apparent link between them. However, the ledger database can provide proof that it is the same person indeed because the unabridged history of name changes is available, it can be queried and relied upon.

2. Recognition of prior learning – a person has been awarded a degree at institution A. Credits from Institution A contributed to a degree at Institution B. The degree at B is revoked due to issues with source evidence (i.e. Institution A). The ledger database makes such ripple effects deterministic – a revocation event at B triggers rules that re-evaluate dependent awards and enrolments at partners, with a verifiable trail of who was notified and when. If Institution A later corrects its own records, Institution B and downstream bodies can attach a superseding record rather than overwrite, preserving full lineage. The entire drama unfolded will always be available.

2½. Recognition of prior learning (bonus) – an employer verified the degree on the hiring date. Months later it is revoked. The employer can present a ledger proof that, on the hiring date, the credential existed and was valid. It reduces dispute risk and supports fair-use decisions such as probation reviews rather than immediate termination.

All this stuff is very real and the right tech stack (i.e. the ledger DB) reduces the complexity tremendously.

[0] Different jurisdictions have different rules but the procedure is more or less similar amongst them.

Consider a leaf commit (or a leaf which is a subtree of commits). I am a person with nefarious intentions, and I delete the leaf commit, forcefully expire the reflogs, or force garbage collect them. At that point, there is no longer remaining evidence in git that the commit ever existed. If git were to be used to record a history of criminal offences, I would be able to single-handedly delete the last offence by running «git reflog expire --expire=now --all» followed by «git gc --aggressive --prune=now».

Ledger databases, on the other hand, do not have the «delete» operation. The «update» operation does not factually update the document/record and creates a new revision instead (just as git does), whilst retaining a full history of updates to the document/record. This is the fundamental difference.

If you're running Git on multiple nodes, it's exactly like running a blockchain on multiple nodes. You can mutate your own local copy, but that doesn't mutate mine, and the set of commits is functionally identical to the union of commits from every node. You can't delete a commit without deleting it from every clone.

Which is why blockchains have become such a ubiquitous technology. They're literally everywhere. Can't swing a cat without hitting a blockchain nowadays.

I've never heard of such a thing