Quantum solvency · Wrapped-asset custodian

WBTC custody reserve

BitGo and BiT Global (Wrapped Bitcoin custodians)

Scored from WBTC proof-of-reserve API, openapi.wbtc.network (live), 92 of 109 published addresses read. The addresses read are the largest declared holdings and cover 99.86% of the declared balance; the remainder is dust that cannot move a balance-weighted number. The holder declared 116,512 BTC at its snapshot; the chain shows 116,350 BTC now. The bitcoin backing Wrapped Bitcoin (WBTC) on Ethereum and other chains, as published by the custodians through their public proof-of-reserve API. Snapshot .

By exposure class

Practical risk

An attacker must recover each key separately. 89 exposed keys hold 10 BTC or more, 114,275 BTC in total; that is the part worth attacking first, and the part to sweep to fresh keys first.

Largest exposed keys

Disclosure freshness

Live endpoint. The holder's endpoint was read 20 days ago.

Custody, as observed on-chain

Of the 91,472 BTC in the 60 addresses read, 0% is spent by a single key (indistinguishable from MPC on-chain), 100% through a multisig script, and 0% has never spent, so its control is not yet visible.

Read from 60 of 109 published addresses, holding 91,472 BTC, on 2026-09-30.

Repeated nonces

134 signatures from 60 keys across 60 addresses were checked and no nonce was repeated.

What it would take to move the exposed balance

470 unspent outputs in 2 transactions, about 0.0006 BTC in fees at the one-hour rate (about $48 at today’s price), using well under one percent of a day’s block space.

Each of the 470 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 2026-09-30T22:43:30.985Z. 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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