By Isaac • June 9, 2026 11:37 am •
Circle announced on June 8, 2026 that cirBTC is live on Ethereum.
The pitch is simple. Circle calls it a 1:1 BTC-backed token built to bring Bitcoin collateral into Ethereum DeFi.
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This is the same company that turned USDC into a default dollar instrument on-chain. Now it wants to do the same thing with Bitcoin.
cirBTC is live on @ethereum . Circle helped establish the institutional standard for dollar collateral with USDC.
Now cirBTC brings that same approach to Bitcoin, bringing 1:1 BTC-backed collateral to institutional DeFi markets with neutrality, transparency, and Circle…
— Circle (@circle) June 8, 2026
The mechanics matter for anyone deciding whether to trust the token. Circle says the underlying BTC
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