Bitcoin News
BitVM2 is the most secure solution for Bitcoin in DeFi
BOB is a hybrid Layer-2 that combines Bitcoin security with Ethereum DeFi innovation. This model positions BTC as the backbone of a new decentralized finance system. Alexei Zamyatin, a BOB Co-Founder and BitVM Core Contributor, says that removing the need for third-party bridges is a major step toward unlocking Bitcoin’s trillion-dollar potential. The team moved from concept to BitVM2 design to prototype and then to public testnet in just one year. BOB launched its BitVM Bitcoin bridge on public testnet in collaboration with Fiamma. BitVM enables off-chain program execution on Bitcoin with on-chain dispute resolution. This bridge allows secure BTC deposits and withdrawals on the BOB hybrid Layer-2 without reliance on third-party custody or multi-sig bridges. Funds remain secure as long as one honest, online node exists. BitVM/acc Implementation Working Group includes ZeroSync, Babylon, Anchorage, Rockaway, and others to drive BitVM adoption. This group unites experts in staking, custody, liquidity provision, market making, research, and blockchain security. The group aims to refine BitVM functionality and satisfy the business needs of both users and operators. Membership is free and open to all interested parties. Founding research partners include Babylon, Bitcoin Layers, BOB, Common Prefix, Fiamma, House of ZK, RiscZero, Succinct, and ZeroSync. This collaboration accelerates the integration of BitVM across the Bitcoin DeFi ecosystem. BitVM2 is the most secure solution for Bitcoin in DeFi.
Mechanics of the BitVM Bridge
The BitVM Bridge is a 3rd generation BTC bridge. First-generation bridges used centralized custodians like wBTC. Second-generation bridges used distributed custodianship where groups of entities managed funds. Third-generation bridges like the BitVM Bridge use trust-minimized smart contract custodianship. This model is based on the assumption that at least one honest participant exists.
| Role | Function |
|---|---|
| Peg-in User | Locks BTC into Bridge Contract A to mint Peg-BTC |
| Peg-out User | Burns Peg-BTC on Bridge Contract B to withdraw BTC |
| Broker | Provides short-term liquidity to fulfill peg-out requests |
| Vigilante | Monitors on-chain activity and initiates challenges |
The peg-in process requires a presigning committee to sign a transaction graph. This committee includes the peg-in user, brokers, and neutral members. They generate an N-of-N multisig wallet to hold the funds. As long as one committee member deletes their private key, malicious actions fail.
The peg-out process requires brokers to provide liquidity. The BitVM Bridge is a way to handle peg-out requests by using brokers who front the requested funds to users and later reclaim the equivalent BTC from Bridge Contract A while earning a fee for their service. This process shifts the operational complexity to the brokers.
The reclaim process is an optimistic mechanism. Brokers submit a KICKOFF transaction on the Bitcoin network to initiate the reclaim. If no challenges occur within a predefined window, usually one week, the reclaim succeeds. Vigilantes can initiate a fraud proof if a reclaim request is invalid. This process uses a chunked implementation of the Groth16 verifier to resolve disputes on Bitcoin’s limited scripting environment.
Fee Calculation and Network Costs
Bitcoin fees depend on transaction size and network congestion. Miners collect fees in satoshis, where one satoshi is 0.00000001 BTC. The amount paid in BTC network fees depends on the size of the transaction. Ethereum uses a different model for gas fees. Users pay gas fees in the native cryptocurrency, such as ETH.
The Ethereum fee formula is: Gas limit * (base fee + optional tip) = Gas fee. The base fee changes according to network activity. A higher gas limit increases the total cost. How do you calculate the exact cost before sending? You should check a live gas tracker like Etherscan before you submit a transaction.
A simple ETH transfer uses 21,000 gas units. If the base fee is 30 gwei and the gas limit is 21,000 units, the fee is 630,000 gwei. This is 0.00063 ETH. At an ETH price of $2,000, this fee is $1.26. Complex actions like token swaps use much more gas than a simple transfer.
| Type | Fee Unit | Calculation Example |
|---|---|---|
| Bitcoin | Satoshi | Size + Congestion |
| Ethereum | Gwei | Gas Limit * (Base + Tip) |
| Solana | SOL | Resource usage |
Ethereum users can avoid high fees by using Layer 2 networks like Arbitrum or Optimism. These networks bundle transactions off-chain and post a single compressed proof to Ethereum. Bridging to an L2 costs a one-time fee, but subsequent transactions cost much less.
Rollup Vulnerabilities and Market Cycles
An adversary can launch a Denial of Service attack on rollups by filling a batch’s blob quota. This fills the Data Availability (DA) space and outbids honest users. The attacker can halt the chain by outbidding benign users for a prolonged period. For example, an attacker can spend 0.87 ETH to halt the Optimism chain for one hour.
The Amplified Finality Delay attack also presents risks. An adversary can flood the L2 with DA-heavy transactions to force frequent batch seals. This prolongs the time until a batch gets finalized in the L1. This attack is more effective through the L2 than a direct L1 attack. For example, an attacker can cause a finality delay of 585 blocks for Optimism using a budget of 10 ETH.
Market analyst Crypto Rover predicts a Bitcoin bottom in October 2026. The fractal model suggests the market entered a bearish phase following the October 2025 peak. The peak in the current cycle occurred around late 2025. The current market shows bullish signs, but these are short-term moves rather than a major trend.
