You asked about Blockchain
7 people built something like it. 2 are gone.
That is 40% of the ones whose fate we could settle, against 23% across the whole register. 2 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | Tools & infra to build and scale high-quality blockchain applications. · quicknode.com | still up |
| 2019-06-01 | YCRainbow Open-source, design centric software for interacting with blockchains · rainbow.me | still up |
| 2018-01-01 | YCMeson Meson is a stablecoin swap protocol among blockchains and Layer 2s · meson.fi | gone |
| 2021-06-01 | YCSatsuma Reliable blockchain indexing & querying for web3 engineering teams. · satsuma.xyz | acquired |
| 2017-06-01 | We help commercial insurance brokers structure complicated… · surematics.com | acquired |
| 2022-06-01 | YCEthosX The protocol for derivatives on blockchains · ethosx.finance | still up |
| 2015-06-01 | YCSerica Financial payment and loan services for the Medical Cannabis and… · sericapay.com | gone |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.