Forget claims and roadmaps — HuggingFace's own API is fully public, no auth required, and it counts real downloads. Four model checkpoints, published under Pearl's own org, with 98,894 combined downloads. One honest caveat before the number does any work: this almost certainly isn't AI-community adoption — it's a miner-participation proxy. The official mining setup passes the model ID straight to the miner container (docker run … vllm_miner pearl-ai/Llama-3.1-8B-Instruct-pearl), so every miner who follows the docs triggers a download whether or not they care about the model itself. The lopsided like-to-download ratios (62,273 downloads, 6 likes on the top model) fit that read better than organic interest. Read it as "how many machines have set up to mine," not "how many developers adopted the model" — still a real number, just a different one than it looks like at a glance.
Strip the mystery away and "duplex" is just the team's word for the trick at the core of the whole protocol: compute that mines and infers at the same time — one GPU pass earning twice. It isn't marketing fluff, either: the idea is formalized in a peer-reviewed economics paper by one of the biggest names in the field — who happens to be on Pearl's payroll. (The name's own backstory lives in the Lore Corner.)
Rafael Pass also gave the full public talk on this paper — produced and published by Pearl Research Labs. Here's the paper, and the exact moment he defines "duplex" in his own words.
The Economics of Proof-of-Useful-Work.
"They can do this thing referred to as a duplex operation… a joint, a two-for-one operation. It participates in both markets at the same time — it co-produces both mining and inference, but maybe with some overhead."
The terminology tell: this paper puts "duplex work" and "Duplexia" into peer-reviewed print for the first time — the formal economic terms for a chain where token rewards subsidize AI inference. The word wasn't coined for the paper, though: it's the team's own internal name for the protocol, older than the paper itself (that story's in the Lore Corner). The read: Pass formalized the team's existing jargon, not the other way around.
RECREATED FROM THE TALK'S "CONJOINT PRODUCTION MARKET" MODEL, IN OUR OWN LAYOUT — NOT A REPRODUCTION OF PASS'S ORIGINAL SLIDE.