What is a Wrapped Bitcoin?

Wrapped Bitcoin, commonly known as WBTC, is an ERC-20 token on the Ethereum blockchain that represents Bitcoin at a 1:1 ratio. Each WBTC token is backed by one Bitcoin held in custody by a network of regulated custodians, primarily BitGo. The wrapping process involves a user depositing Bitcoin with a custodian through a merchant, after which an equivalent amount of WBTC is minted on Ethereum. To redeem the underlying Bitcoin, the process is reversed — WBTC is burned and the equivalent BTC is released from custody. This mechanism allows Bitcoin holders to access Ethereum-based applications while maintaining exposure to Bitcoin's price.

The fundamental purpose of Wrapped Bitcoin is to bridge the gap between Bitcoin's dominant market liquidity and Ethereum's rich ecosystem of decentralized applications. Bitcoin, for all its value, is a relatively simple blockchain optimized for security and settlement rather than programmability. It cannot natively participate in Ethereum smart contracts, DeFi protocols, or NFT markets. By converting Bitcoin into an ERC-20 token, WBTC brings Bitcoin's liquidity into these environments. A Bitcoin holder can use WBTC as collateral on lending platforms like Aave, provide liquidity in Uniswap pools, or participate in yield farming strategies — all activities that native Bitcoin cannot engage in.

The custodial model behind WBTC introduces a trust assumption that pure Bitcoin advocates often highlight as a limitation. Unlike Bitcoin itself, whose possession is secured purely by cryptographic private keys, WBTC relies on custodians to honestly hold the underlying BTC. BitGo publishes on-chain proof of reserves, and the minting and burning process is publicly verifiable on the Ethereum blockchain, which provides significant transparency. However, custodial risk — including regulatory action, insolvency, or security breaches affecting the custodian — remains a real consideration. For traders, WBTC represents a pragmatic tradeoff between Bitcoin's store-of-value properties and the composability of Ethereum-based finance.

From a market perspective, WBTC tracks the price of Bitcoin almost perfectly, since each token can be redeemed for the underlying asset. This tight peg is maintained through arbitrage: if WBTC trades at a discount to BTC, merchants can buy WBTC cheaply, redeem it for Bitcoin, and profit from the difference. If it trades at a premium, they can deposit Bitcoin to mint more WBTC and sell it at the higher price. This self-correcting mechanism keeps the peg remarkably stable in normal market conditions. WBTC has grown to hold billions of dollars in Bitcoin, making it one of the largest custodied Bitcoin products in existence.

For automated traders and DeFi participants, WBTC opens up strategy opportunities that would otherwise require juggling multiple blockchain networks. A bot can hold WBTC in an Ethereum wallet, deploy it as collateral for a stablecoin loan, use that stablecoin to provide liquidity, and earn fees — all within a single blockchain environment using standardized interfaces. Other wrapped asset implementations exist beyond WBTC, including renBTC and tBTC, which use different trust models including decentralized custody mechanisms. Understanding which wrapped asset a strategy depends on, and the respective trust assumptions of each, is important for proper risk management when deploying capital in DeFi environments.