Circle launched cirBTC on Ethereum. It is a 1:1 wrapped Bitcoin product designed to give BTC more utility in DeFi, including lending, DEXs, tokenized assets and stablecoin markets.

The key detail is not wrapped BTC itself. There are already many versions of it. The key detail is Circle's attempt to make the reserve model easier for institutions to evaluate through Chainlink Proof of Reserve and transparent BTC addresses.

Wrapped Bitcoin always requires trust: who holds the BTC, how reserves are checked, what happens during redemption and whether the product can survive stress. For retail users, it is a bridge. For institutions, it is collateral risk.

What to watch next: whether liquidity appears against WBTC and cbBTC, and whether DeFi protocols accept cirBTC as trusted collateral.