Bitcoin Magazine Podcast
Jeremy Rubin on Char: The Infrastructure Bet Underneath Every Bitcoin L2
Why It Matters
Sequencing is a critical weak point for many Bitcoin layer‑2 solutions, and Char’s approach could enable truly decentralized roll‑ups, enhancing security and trustlessness. By leveraging Bitcoin’s native economics and novel cryptographic primitives, the protocol offers a scalable path forward for the ecosystem, making the episode especially relevant as L2 adoption accelerates.
Key Takeaways
- •Char provides decentralized sequencing for Bitcoin layer‑2 rollups.
- •Uses proof‑of‑stake slashing to prevent equivocation attacks.
- •Implements EVRF‑based Purify library to simplify signature attestations.
- •Replaces trusted bridge operators with open miner participation.
- •Leverages garbled circuits for high‑throughput Bitcoin settlement.
Pulse Analysis
In this episode Jeremy Rubin explains Char’s core mission: to eliminate the single‑point‑of‑failure that plagues most Bitcoin roll‑up solutions. By offering a decentralized sequencing layer, Char lets multiple participants order bridge withdrawals and other off‑chain data without relying on a privileged committee. This approach directly addresses the chronic trust‑assumption problem in existing L2s, where a small operator can censor or reorder transactions, undermining the security guarantees that Bitcoin users expect.
Char achieves its trust‑minimal design through a novel proof‑of‑stake slashing mechanism. Stakers lock Bitcoin as collateral; any equivocation—signing two conflicting messages—triggers an automatic burn of the offending stake. This economic penalty mirrors the concept of “self‑destructing ASICs” discussed early in the talk, providing a deterrent that is both simple and verifiable on‑chain. The protocol also incorporates a verifiable random function (EVRF) called Purify, which dramatically reduces the context needed to prove honest behavior, streamlining attestations and cutting protocol overhead.
Beyond security, Char pushes the performance envelope by integrating garbled‑circuit primitives, enabling high‑throughput settlement that rivals traditional side‑chains and Lightning‑style networks. By open‑sourcing the Purify library and aligning with Bitcoin’s immutable consensus, Char positions itself as a scalable, censorship‑resistant infrastructure layer for the next generation of Bitcoin applications. For enterprises and developers seeking a robust L2 foundation, Char offers a compelling blend of decentralization, economic safety, and advanced cryptographic tooling.
Episode Description
Every Bitcoin Layer 2 quietly depends on a trusted operator to order transactions and that's the single point of failure Jeremy Rubin wants to kill. In this MIT Bitcoin Expo conversation with Bitcoin Magazine's Shinobi, Rubin breaks down Char Network, a decentralized shared sequencer that lets anyone participate like a miner. He explains how staked Bitcoin gets burned the moment a participant cheats, and why anchoring proof of stake to Bitcoin avoids the pitfalls of standalone PoS chains.
Grab your copy THE 2036 ISSUE👇https://store.bitcoinmagazine.com/pages/the-2036-issue
🔶 Shinobi — Bitcoin Magazine
🔶 Jeremy Rubin — Founder & CEO, Char Network
Chapters:
00:41 — Who is Jeremy Rubin and what is Char Network
02:26 — The sequencing problem inside Bitcoin Layer 2s
03:49 — Decentralizing the trusted bridge operator
05:54 — Equivocate and your staked Bitcoin gets burned
08:09 — Long-range attacks vs Bitcoin-anchored security
10:47 — Signatures, the torus, and exposing private keys
14:06 — The hunt for a VRF and discovering eVRFs
15:33 — MuSig, deterministic nonces, and the Purify library
18:11 — Garbled circuits and a Bitcoin behind every blade of grass
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DISCLAIMER: The views and opinions expressed in this show are those of the participants and do not necessarily reflect the official policy or position of BTC Inc., Bitcoin Magazine, or any affiliated entities. This content is provided for informational and educational purposes only and should not be construed as investment, legal, tax, or accounting advice. Nothing contained in this show constitutes a solicitation, recommendation, endorsement, or offer to buy or sell any securities or financial instruments. Viewers should consult their own advisors before making financial or business decisions.
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