Recorded in Toronto, Canada.
Christian Lewe, a researcher at Alpen Labs, explains the one-time signature schemes used in BitVM bridges: Lamport, Winternitz, and adaptor signatures. He describes how anti-chain Winternitz counters the malleability of ordinary hash chains, why these signatures support off-chain proof and fraud-proof workflows, and why BitVM currently needs them under Bitcoin Script’s opcode limitations.
The conversation then turns to the potential of `OP_CHECKSIGFROMSTACK` and Schnorr signatures, which could make the bridge construction more efficient if activated. Christian also discusses witness encryption, PIPEs v2, the difficulty of cryptographic research, and Alpen Labs’ work toward simpler, more secure bridges.
