2019 to 2026: How a 2017 Idea Became a Running Testnet

This page is a dated record of how the ideas in a September 2017 letter became a running network. It follows one rule throughout: every dated claim is either checkable in a public record or explicitly marked as personal recollection. Entries in the private record that rest only on recollection, with no third-party timestamp, are left out of this page by policy, a documentary page that mixes evidence grades without saying so isn't one.

January 15, 2019, the vocabulary arrives at a meetup

The 2017 letter described requirements in plain Turkish: user-held identity, granular control over who sees which piece of personal data, data as an economic layer serving the person who produces it. What it conspicuously lacked was names for any of this, because in 2017 the names barely existed.

The names arrived on January 15, 2019, at Python Saati #81, "Semantic Web, Linked Data ve Python", a public Python Istanbul meetup organized by Samet Atdağ, with Ahmet Melek presenting on the Semantic Web, Linked Data and Python, hosted at the Yıldız Technical University Davutpaşa technopark. The event is public record, a recording under the event's name is on YouTube. What happened in its Q&A is the founder's own recollection, and is marked as such: by his account, he raised the idea that Solid pods could hold personal data with a blockchain-based wallet layer on top, so people could control, and earn from, their own data. Whatever the exact wording that evening, the substance is the architecture Solidus still describes today: Solid-style personal data storage below, a chain-anchored credential layer above.

Two years after the letter, the intuition had its vocabulary: RDF, Solid, linked data. The storage half of the problem, named by the community that had been building it for years.

2019–2024, the standards become legible

This section is the entire argument of the arc, and none of it is about Solidus. It is about what the rest of the world published, on the public record:

• November 2019, the W3C publishes the Verifiable Credentials Data Model 1.0 as a Recommendation: a standard shape for a signed, portable, checkable claim.
• July 2022, W3C DID Core becomes a Recommendation: a standard way to identify someone without a central registrar.
• The early 2020s, selective-disclosure credential formats mature in the open: the SD-JWT line of work at the IETF, and the BBS+ signature suite specified through the W3C/DIF community, the cryptographic machinery for showing one field of a credential without showing the rest.
• May 2024, eIDAS 2.0, Regulation (EU) 2024/1183, enters into force: EU member states are required to offer citizens a digital identity wallet, on an implementing timeline that lands in the late-2026 window. User-held identity stops being an idealist's sketch and becomes a legal deadline.

A 2017 email could name the problem. It could not have built an interoperable answer, because the standards that make the answer interoperable did not exist yet. By 2024 they did, written, reviewed and published by other people, which is why the resulting stack is composed rather than invented.

January 2025, the company

Solidus Network was founded in January 2025 to build on exactly that stack. The founding is recent and the record honest about what that means: the company is younger than most of the standards it implements, deliberately so, since the thesis was always that this becomes buildable only once the standards exist.

What this arc proves, and what it does not

It does not prove the thesis is right. The difference this record can honestly claim is smaller and checkable: the problem was legible in 2017, the standards became legible between 2019 and 2024, and the thing that now exists can be verified by a stranger without trusting anyone's memory, including the founder's. What "no pivot" actually means, and what it doesn't, is the subject of the next page.