BitVM3 is hacky? Maybe, but at least it's finally cheap. @build_on_bob just got the onchain cost for the most expensive part of BitVM3 down to ~$11 at 4 sats/vbyte. That's 87% cheaper than before. So what was broken #BitVM3 needs to verify garbled circuits onchain. The old approach was expensive as hell - like, only-makes-sense-for-big-money expensive. Not exactly viable if you want regular people to use a Bitcoin bridge. BOB implemented cut-and-choose to fix that. It's a way to verify calculations are actually legit using some cryptography tricks. The technical bit They treat data as polynomials. Reveal one missing value, get all the others for free. Post one piece of data onchain, the rest follows. Second thing they figured out - adaptor signatures. You reveal data through the signature, no extra onchain stuff needed. Wide labels - one signature check covers 256 possible values. That's 8 bits of data from a single check instead of checking each bit separately. Why you should care BitVM3 powers BOB's native BTC bridge. No custodians, no wrapped tokens. Real Bitcoin moving trustlessly. Cheaper onchain costs mean the bridge actually works for normal transfers, not just whale-sized moves. This also unlocks dynamic public inputs down the line, which means they can reuse circuits instead of storing everything fresh each time. Bridge launch is targeted for early 2026. ngl it's cool seeing this stuff actually work on mainnet. Bitcoin moves slow until it doesn't.