From: Threshold Labs To: [POC], MetaMask / Consensys Date: February 2026
MetaMask is building the single interface for all of crypto — native Bitcoin, Solana, Aave yield, the MetaMask Card. Bitcoin is the most important piece, and it's half-finished. Users can hold BTC but can't earn on it, lend it, or use it as collateral. tBTC completes that story.
tBTC — largest decentralized BTC bridge. $540M+ TVL, 5,900+ BTC on-chain, $4.8B+ bridge volume, 9 chains. 1:1 minting (one BTC in, one tBTC out), threshold cryptography, full redemption to native BTC. Standard ERC-20. Live on Aave with $155M+ in deposits.
We've built a MetaMask Snap — cross-chain tBTC balance tracking, deposit monitoring, real-time notifications, automatic receipt backup. Ready to publish.
Proposal:
- tBTC Snap published to the Snaps directory
- MetaMask featured as recommended wallet in the Threshold dApp (3 months)
- Joint blog + social. We lead on content creation.
- Defined pathway to Phase 2 as part of this agreement
MetaMask's current BTC path (Li.Fi → ThorChain) outputs ETH or stables. Users exit Bitcoin exposure. tBTC is structurally different: 1:1 mint, no intermediary token, user retains BTC exposure as an ERC-20. Complementary to the existing flow — ThorChain for users converting out of BTC, tBTC for users keeping Bitcoin exposure while making it productive.
Why this matters commercially: Each tBTC bridge generates MetaMask's 0.875% fee. Users who later swap tBTC generate additional fees. The asset persists in the wallet ecosystem rather than passing through as a one-time swap.
DeFi activation: MetaMask Earn already gives users stablecoin yield via Aave. tBTC is live on Aave today. Extending Earn to support tBTC gives Bitcoin holders the same experience — a direct answer to "I hold BTC in MetaMask, now what?"
Integration: Via the tBTC SDK (TypeScript). Handles deposit initiation, Bitcoin address generation, and minting. Keeps MetaMask-side engineering lean.
Bitcoin is largely absent from Linea. No existing bridge provider supports native BTC deposits to the network.
tBTC provides the first BTC-to-Linea pipeline: deposit BTC → mint tBTC → deploy on Linea for DeFi. Technical path via Linea's canonical token bridge, deployed jointly with the Linea team.
End-to-end: MetaMask users mint tBTC, bridge to Linea, earn yield. Bitcoin active across the full Consensys stack.
- Phase 1 — Snap co-marketing with pathway to Phase 2
- Phase 2 — tBTC as a BTC bridge rail in MetaMask via SDK integration
- Linea — joint deployment of tBTC via canonical bridge, featured BTC asset status
- Joint announcement — we'll invest in making it compelling
| Model | 1:1 mint/redeem, no slippage, no intermediary |
| Security | Threshold cryptography, decentralized signers, no single custodian |
| Track record | 4+ years, zero loss of user funds |
| Scale | $540M+ TVL, 5,900+ BTC, $4.8B+ volume |
| Chains | Ethereum, Arbitrum, Optimism, Base, Polygon, Solana, StarkNet, Sui, BOB |
| DeFi | Aave ($155M+), lending, swaps, LPs |
| Integration | TypeScript SDK; MetaMask Snap already built |
Threshold Labs builds products and partnerships for tBTC — the bridge that has secured billions in Bitcoin volume with zero loss of user funds.
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