cirBTC is live on Ethereum as a 1:1 BTC-backed token, with native Arc support coming at mainnet launch. Designed for tokenized BTC transparency, cirBTC combines: → Segregated BTC custody → Disclosed reserve addresses → Chainlink Proof of Reserve → Onchain reserve data for verification A clearer reserve foundation for BTC-backed collateral across supported programmable markets. https://www.circle.com/blog/cirbtc-a-clearer-reserve-standard-for-wrapped-btc(Circle)