Char is a Bitcoin-anchored proof-of-stake coordination and shared sequencing protocol for rollups and applications, founded by Jeremy Rubin. Char's Twitter Score is 15 out of 1000 as of August 2026, ranking #65,364 among 485,375 tracked accounts.
Char enables rollups and applications to coordinate outcomes on Bitcoin without altering Bitcoin's consensus rules or requiring a soft fork. The protocol works through Bitcoin bonds: operators lock BTC, publish signed updates, and receive stake-weighted voting power via lagged stake snapshots. Independently verifiable decision rolls are produced once an outcome crosses a two-thirds stake threshold.
Char incorporates a non-equivocation mechanism called PureSign, designed so that any operator who double-signs for the same ballot automatically exposes their private key. The protocol does not provide data-availability guarantees; applications are expected to manage their own data-availability and retrieval strategies. Its initial focus is validium-style rollups with precommitments, though listed use cases extend to bridge attestations, rollup sequencing, and shared ordering.
Char describes its current implementation as an open-source prototype built within a fork of Bitcoin Core, incorporating BTC bonds, stake weighting, signed updates, peer-to-peer synchronization, ballots, decision rolls, PureSign proofs, attestation payloads, and an RPC interface for domains. Its published roadmap covers BitVM-based on-chain enforcement, a Charmed VM and reward engine, verifier libraries, SDKs, parameter hardening, and ecosystem integrations. The project's welcome announcement, published on its blog, introduced Bitcoin-anchored bonded operators and Ember consensus. Char has been mentioned by 7 accounts a total of 10 times, and the account has published 1 posts.
Who follows Char on X?
The accounts that follow Char include 62 founders, 13 angel investors and 15 influencers, among them Tarun Chitra, Eric Wall, Jameson Lopp, Dan Elitzer, Jon Charbonneau and Jeff Park.