The Avalanche Bridge (AB), developed by Ava Labs, facilitates the secure and efficient transfer of assets between the Avalanche and Ethereum networks, as well as Bitcoin. Launched in July 2021, AB replaced the previous Avalanche-Ethereum Bridge (AEB), offering reduced fees, stronger security, and faster transaction finality. The bridge supports transfers of ERC-20 tokens and Bitcoin (BTC)
One of the easiest ways to use the Avalanche bridge is through https://core.app/en/bridge/
Users send ERC-20 tokens to the Avalanche Bridge address on Ethereum. The bridge nodes, utilizing a combination of smart contracts and Intel SGX (Software Guard Extensions) technology, validate the transaction. Once validated, wrapped tokens (e.g., USDC.e) are minted on Avalanche and sent to the user’s address on the Avalanche C-Chain.
Users initiate the process by burning the wrapped tokens on Avalanche. Once this transaction is confirmed, the equivalent ERC-20 tokens are unlocked on Ethereum and sent to the user’s Ethereum address.
Users send BTC to a bridge-controlled address using the Core Wallet interface. After confirmation, equivalent BTC.b tokens are minted on Avalanche. For transfers back to Bitcoin, BTC.b tokens are burned on Avalanche, and the equivalent amount of Bitcoin is sent to the user’s Bitcoin address.
Transfers typically take 10–15 minutes due to Ethereum’s finality constraints, while the Avalanche side processes transactions in a few seconds.
For first-time users, a small amount of AVAX is airdropped for transactions larger than $75 to cover initial transaction fees on Avalanche.
The Avalanche Bridge employs a robust security model that includes:
To facilitate transactions on Avalanche, the AVAX token is required. For transfers over $75, a small amount of AVAX is airdropped to users’ wallets to enable initial transactions.
Only transactions to the same wallet address on the other chain are supported. Sending tokens directly to the bridge’s wallet can result in loss of funds. Smart contract wallets like Ambire or Gnosis Safe are not supported.
The security relies on the reputation and integrity of the bridge nodes. Any collusion or compromise among the bridge nodes could pose significant risks to the assets being transferred.
The Avalanche Bridge represents a significant advancement in cross-chain interoperability, offering users a secure, efficient, and cost-effective solution for transferring assets between Avalanche, Ethereum, and Bitcoin.
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