Wrapped Bitcoin is splitting into two philosophical camps. On one side sits cirBTC, Circle's institutional wrapped BTC announced in 2026, backed 1:1 by native BTC held in regulated custody. On the other sits tBTC, Threshold Network's decentralized wrapped BTC secured by a distributed signer set using threshold cryptography. Both promise BTC liquidity on Ethereum and other EVM chains. The tradeoffs between them define the central debate in wrapped Bitcoin design.
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This guide breaks down how each token works, who runs it, what backs it, and which model fits which use case. If you are an institution evaluating wrapped BTC for treasury, lending, or trading workflows, the custodial vs threshold-secured distinction matters more than supply or chain coverage.
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cirBTC is Circle's wrapped Bitcoin product, announced in 2026 and currently in waitlist phase pending regulatory approvals. It is 1:1 backed by native BTC held by Circle's custody partners, with reserves verifiable onchain. Launch chains are Ethereum and Arc, Circle's institutional L1.
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cirBTC inherits the operational and compliance posture of USDC and EURC. Authorized participants mint and redeem cirBTC directly with Circle, with reserves attestations on a recurring cadence. Target users are OTC desks, market makers, lending protocols, and corporate treasuries that need regulatory clarity and named-counterparty trust.
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tBTC is Threshold Network's decentralized wrapped BTC. There is no single custodian. Instead, a randomly selected group of node operators called the signer set holds BTC collectively using threshold cryptography. To move or burn the underlying BTC, a majority of signers must produce signature shares that combine into a single valid Bitcoin signature.
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tBTC supply sits above $500M per DeFiLlama. The token is live on Ethereum, Arbitrum, Base, Polygon, and Optimism. Signers stake the Threshold Network token (T) as collateral and can be slashed for misbehavior. There is no Circle, no BitGo, no named custodian holding the BTC.
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The clearest way to see the difference is side by side. The table below maps the two tokens against the dimensions that matter most for institutional and DeFi users.

tBTC uses a rotating signer set. When a user deposits BTC to mint tBTC, the Threshold Network protocol randomly selects a group of signers from the active operator pool. Those signers collectively control a Bitcoin address using a threshold signature scheme. No single signer holds a full key.
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To move the BTC, a threshold of signers (typically a supermajority) must each produce a signature share. Those shares aggregate into one valid Bitcoin signature. If signers go offline, collude, or sign maliciously, the protocol slashes their staked T tokens. The signer set rotates periodically to limit the window any specific group controls.
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The result is a wrapped BTC where the trust assumption is "a majority of randomly selected, economically bonded signers will not collude," rather than "Circle will honor redemptions." Different model, different risk surface.
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cirBTC custody follows the same model Circle uses for USDC and EURC reserves. Native BTC is held by Circle and its qualified custody partners under regulated arrangements. Reserves are published onchain and subject to attestations.
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Minting happens through authorized participants, similar to how USDC works at the institutional layer. An AP sends BTC to Circle, Circle issues cirBTC on Ethereum or Arc. Redemption reverses the flow. There is no permissionless mint path at launch. This mirrors how regulated wrapped products typically operate, trading openness for compliance clarity.
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Redemption is where the two designs diverge most sharply. With cirBTC, an authorized participant submits a redemption request to Circle, Circle burns the cirBTC, and BTC is released from custody to the AP's wallet. The process is permissioned, auditable, and bound by Circle's compliance program.
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With tBTC, any holder can initiate redemption directly through the Threshold Network app. The signer set is instructed to release BTC from the collective wallet to the redeemer's Bitcoin address. No KYC at the protocol layer, no application gate. The cost is operational complexity and longer settlement windows during periods of signer rotation or network congestion.
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Institutions with compliance requirements typically prefer the custodial model. A regulated lender, an OTC desk, or a corporate treasury wants a named issuer it can sue, audit, and underwrite. cirBTC fits that brief. So do wBTC and cbBTC, with different custodians and disclosure regimes.
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DeFi-native users, DAOs, and protocols that prize censorship resistance often prefer threshold-secured models. tBTC has no off switch a regulator can pull. No Circle, no BitGo, no Coinbase to freeze. The tradeoff is that the trust assumption is cryptographic and economic rather than legal, which is harder for many institutions to underwrite.
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Both tokens face the same problem once they exist on a single chain: getting from one chain to another. tBTC is natively deployed on multiple chains via canonical bridges from Ethereum. cirBTC will launch on Ethereum and Arc, with cross-chain availability dependent on Circle's roadmap and CCTP-style infrastructure for native movement.
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Cross-chain orchestrators like Eco Routes can route either token across supported chains once liquidity exists. The mechanics differ (canonical bridge for tBTC, native issuance or burn-and-mint for cirBTC when available), but the user-facing experience converges: deposit on chain A, receive on chain B.
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cirBTC risks concentrate at the custodial layer. Counterparty risk to Circle, regulatory risk around the approval process, and operational risk in the custody partner stack. These are well-understood institutional risks.
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tBTC risks concentrate at the protocol layer. Signer collusion (mitigated by random selection and slashing), threshold cryptography implementation risk, and operational risk during signer rotation. These are less familiar but quantifiable through economic security analysis of staked T.
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Neither is strictly safer. They are different bets on what fails first: institutions or cryptographic systems.
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cirBTC and tBTC sit at opposite ends of the wrapped Bitcoin spectrum. cirBTC trades openness for compliance and named-counterparty trust, fitting institutions that need regulatory clarity. tBTC trades operational simplicity for censorship resistance and permissionless access, fitting DeFi-native users who prefer cryptographic over legal trust. Most large allocators will hold both, sized to the workflow.
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cirBTC specifics drawn from circle.com/cirbtc and Circle's 2026 announcement materials. tBTC mechanics from threshold.network documentation. Supply figures from DeFiLlama BTCfi category. All figures current as of May 2026. Where Circle has not published a specific number, we frame the product as announced rather than live.