Every fact below draws on Offsetra's own current site, carbon.fyi's own /about page, and the public GitHub record. The frame here is different from a typical gap audit: this is a credit to real prior art, plus an honest look at what's changed and what hasn't since 2019.
Offsetra started with an airline-flight carbon calculator in 2019, then built one of the first Ethereum-network carbon-footprint methodologies (estimating wallet-level emissions from mining-pool geolocation and transaction timing) and pioneered early NFT/gaming carbon integrations, per independent coverage (Reset.org) and Offsetra's own KlimaDAO collaboration writeup. Both github.com/Offsetra/ethereum-emissions-calculator and github.com/dapped/carbon.fyi returned HTTP 200 when checked directly for this recon: the original methodology remains publicly inspectable years later, not an abandoned artifact.
Source: en.reset.org/carbon-offset-scheme-offsetra-helps-cryptocurrency-users-balance-out-their-carbon-footprint/; GitHub repos verified live 2026-07-16
carbon.fyi's own /about page states directly: "This website is maintained by Klima Protocol and Carbonmark," and separately: "The original carbon.fyi developed by Offsetra (including the Ethereum address CO2 calculator) is still fully available" via a dedicated legacy link. This is a rare, honest attribution chain in a market where prior art often gets quietly absorbed, worth naming as a credit to everyone in it: Offsetra for building it, and Klima/Carbonmark for keeping the credit visible rather than erasing it.
Source: carbon.fyi/about (fetched 2026-07-16, exact quotes above)
offsetra.com returns an identical branded 404 page (49,591 bytes) for /robots.txt, /llms.txt, /.well-known/agent-card.json, /.well-known/security.txt, ai.txt, /sitemap.xml, AND a nonsense-path control: every one byte-for-byte identical, confirming there is no robots.txt, no sitemap, and no agent-discovery surface of any kind, even though the homepage itself is genuinely live (200, 214,721 bytes). The current carbon.fyi (www.carbon.fyi, run by Klima Protocol/Carbonmark) shows the identical pattern at its own scale: a consistent 9,775-byte 404 for the same set of paths plus the control. This is the starkest 'nothing at all' case we've seen, not a soft-catch trick, just a legacy site (and its successor) that never shipped even basic SEO-era infrastructure.
Source: offsetra.com/robots.txt, www.carbon.fyi/robots.txt, both control paths (fetched 2026-07-16, byte counts + diff above)
This is a lineage note, not a gap-audit. Offsetra's carbon.fyi made an on-chain wallet's aggregate carbon cost legible to an ordinary user, a real innovation, years ahead of the market, honestly credited by the team (Klima Protocol and Carbonmark) that maintains it today. EWP continues the same underlying instinct, making a specific action's real-world impact legible and actionable directly from on-chain state, but runs it forward instead of backward: instead of estimating what a past transaction already cost, EWP funds, proves (photo+GPS+signature), and settles a specific real-world contribution on-chain, with a persistent receipt. No claim of relationship, adoption, or comparison of scale is made here, only a credit to real prior art, and an honest note on where that same thread leads next.
