[Circle: Tokenized Bitcoin cirBTC Backed 1:1 by Native Bitcoin is About to Launch] Circle CEO Jeremy Allaire announced on the X platform that cirBTC is about to launch. Circle Wrapped Bitcoin (cirBTC) is a tokenized Bitcoin backed 1:1 by native Bitcoin, issued by Circle on the Ethereum mainnet and the Arc network. Each cirBTC is backed 1:1 by native Bitcoin held in reserve, which is custodied by regulated entities under the Circle group.