Quantum solvency · Protocol

sBTC peg wallet

Stacks sBTC signer set (15 signers)

Scored from sBTC documentation, docs.stacks.co (2026-09-30), 1 of 1 published addresses read. The bitcoin backing sBTC sits in one Taproot address held by the signer set. The address rotates when the signers rotate, so it is re-read from the documentation before each snapshot. Taproot addresses reveal their key by design. Snapshot .

By exposure class

Practical risk

An attacker must recover each key separately. 1 exposed key holds 10 BTC or more, 2,485 BTC in total; that is the part worth attacking first, and the part to sweep to fresh keys first.

Largest exposed keys

Disclosure freshness

Published this month. Read from a publication dated 2026-09-30, 19 days ago. One address that changes when the signer set rotates.

Custody, as observed on-chain

Of the 2,486 BTC in the 1 address read, 0% is spent by a single key (indistinguishable from MPC on-chain), 0% through a multisig script, and 0% has never spent, so its control is not yet visible.

Read from 1 of 1 published addresses, holding 2,486 BTC, on 2026-09-30.

Repeated nonces

26 signatures from 1 key across 1 address were checked and no nonce was repeated. For 1 busy address only the most recent transactions were read.

What it would take to move the exposed balance

1 unspent outputs in 1 transaction, about 0.0000 BTC in fees at the one-hour rate (about $0 at today’s price), using well under one percent of a day’s block space.

Each of the 1 unspent outputs is spent once into one fresh output of the same script family, in transactions of up to 400 inputs. Fee rates are mempool.space's recommendations at 2026-09-30T22:37:48.463Z. Signing ceremonies, custody procedures and withdrawal queues are not included and usually dominate.

Live badge for this reserve. It reads the latest snapshot and links back here.

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