Скачать или смотреть Practical Bitcoin BitVM Bridges |Ekrem Bal | OPNEXT 2025

This talk given at OP_NEXT 2025 focuses on Citrea's practical BitVM implementation on Bitcoin. Ekrem Bal explains how BitVM works by splitting gigabyte-sized verification scripts into chunks, enabling users to place and verify proofs on-chain. He details the roles of signers, operators, watchtowers, and challengers in their FIFO bridge system that uses constant 10 BTC denominations. The presentation covers transaction flow diagrams, collateral efficiency, Bitcoin light client verification, and how upcoming upgrades like OP_CTV could eliminate multisig requirements.

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Notes:
BitVM proof is 1GB, split into chunks for verification
Proof upload requires 2MB, disproving takes 4MB
Bridge uses fixed 10 BTC denominations with FIFO
Watchtowers provide 144-byte longest chain proofs
Requires 2 BTC collateral per operator
Can handle 500 withdrawals per round transaction