tBTC wallet

What is tBTC (TBTC)?

tBTC is bitcoin represented on smart contract chains, backed one to one by main-net BTC. What distinguishes it from custodial wrappers is who holds the deposits: a rotating, randomly selected group of node operators on the Threshold Network controls the underlying wallets through threshold signatures, so no single operator can move the bitcoin and the selected group changes over time.

A few things shape what holding it feels like:

• It is not BTC. The redemption path back to native bitcoin runs through the protocol's contracts.
• The same asset exists on several chains, separately. Ethereum is the home contract; the versions on other chains are bridged representations, and a balance on one chain is simply not present on another until it is moved across. Sending to a recipient means matching the chain they expect, since an EVM address is written identically on all of them.
• Solana behaves differently from the EVM chains. There tBTC is an SPL token living in its own token account, and SOL covers both the rent for that account and the transaction fee.

Also worth knowing: an earlier generation of tBTC existed before the current design, so old guides and old contract references circulate. The version in active use today is the threshold-signature one.

Supported networks in Tangem (6): Arbitrum One, Base, Ethereum, Optimism, Solana, Polygon POS. Each chain's tBTC is shown as its own balance with the network named on the transfer screen before the card signs, which puts that choice in plain sight at the point it matters. Given how many places this token lives, that clarity is the argument for keeping it in Tangem.