Char: The Infrastructure Bet Underneath Every Bitcoin L2
summary
A decentralized shared sequencer for Bitcoin Layer 2s that replaces a single trusted operator with open participants, using a Bitcoin-anchored proof-of-stake design where staked Bitcoin burns on equivocation and miners can sweep timed punishment outputs. It integrates garbled circuits for withdrawals, MuSig deterministic nonces, and an eVRF-based Purify implementation to fix signature nonces and simplify enforcement. A working Purify library is published and the protocol is rewritten to be much simpler and auditable.
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chapters (10)
- 0:00Start
- 0:41Who is Jeremy Rubin and what is Char Network
- 2:26The sequencing problem inside Bitcoin Layer 2s
- 3:49Decentralizing the trusted bridge operator
- 5:54Equivocate and your staked Bitcoin gets burned
- 8:09Long-range attacks vs Bitcoin-anchored security
- 10:47Signatures, the torus, and exposing private keys
- 14:06The hunt for a VRF and discovering eVRFs
- 15:33MuSig, deterministic nonces, and the Purify library
- 18:11Garbled circuits and a Bitcoin behind every blade of grass
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