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Author: Admin | 2025-04-28
Send safety violation evidence that can be directly verified on Bitcoin. The Babylon Bitcoin staking protocol introduces a mechanism to facilitate slashing in response to safety violations. This mechanism involves a time-lock of the staked Bitcoin and the exposure of the secret key that controls the locked Bitcoin whenever the staker or the delegated validator double-signs (similar to a double-spend) on the PoS chain. Babylon employs extractable one-time signatures (EOTS) to realize accountable assertions, where using the same secret key to sign different blocks at the same height results in secret key leakage. Babylon introduced an additional signing round after the base consensus protocol, called the finality round. A block is considered finalized only if it receives EOTS signatures from over 2/3 of the bitcoin stake. All safety violations of the consensus can be reduced to double signing in this round. If there is a safety violation in this modified protocol, then some of the bitcoin stake has signed two blocks at the same height using EOTS. This leads to the extraction of the secret keys associated with these stakers. The EOTS signature scheme can be implemented by Schnorr signatures, which is natively supported by Bitcoin. Hence these extracted secret keys can be used to slash the staked bitcoin.B² Network Secured by BabylonB² Hub incorporates a PoS blockchain that ensures the security of B² Hub through Validators who have staked assets (BTC and B² native token), and guarantees the Data Availability of Rollups as well as the validity of state transitions through B² Hub’s Validators.The consensus mechanism of B² Hub requires an effective Validator Set to carry out BFT consensus on the blocks during an Epoch, including proposing and voting. Each block is then EOTS-voted by Bitcoin-staked finality providers through Babylon’s Bitcoin staking protocol. At the same time, in the B² Hub, the next Epoch will check the previous blocks, becoming a checkpoint via Babylon’s Bitcoin timestamping protocol. The final confirmation of blocks in B² Hub needs to go through two checkpoints.Rollups that access B² Hub have two confirmations:After passing the verification of B² Hub, Rollups complete the first confirmation;B² Hub submits DA Proof and State Transition Verification Commitment to the Bitcoin blockchain, and after the Challenge Period, Rollups complete the final confirmation;B² Network makes the consensus confirmation of B² Hub more secure through Babylon Bitcoin staking protocol. In addition, B² Network avoids long-range attack through Babylon’s BTC timestamping protocol.Long-Range
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