Quantum solvency · Exchange

BitMEX

BitMEX (proof-of-reserves address set)

Scored from BitMEX proof of reserves, public S3 bucket (2026-05-12), 131 of 131 published addresses read. The holder declared 14,453 BTC at its snapshot; the chain shows 7,555 BTC now. BitMEX publishes every reserve address with its balance at a block height, roughly weekly, with an open verifier. It moves coins between addresses between files, so the balance read from the chain today can differ from the file total until the next publication. Snapshot .

By exposure class

Practical risk

An attacker must recover each key separately. 2 exposed keys hold 10 BTC or more, 7,539 BTC in total; that is the part worth attacking first, and the part to sweep to fresh keys first.

Largest exposed keys

Disclosure freshness

Months old. Read from a publication dated 2026-05-12, 160 days ago. BitMEX moves coins between addresses between files, so chain balances drift from the file within days.

Custody, as observed on-chain

Of the 7,555 BTC in the 60 addresses read, 100% 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 60 of 131 published addresses, holding 7,555 BTC, on 2026-09-30.

Repeated nonces

10,364 signatures from 60 keys across 60 addresses were checked and no nonce was repeated. For 32 busy addresses only the most recent transactions were read.

What it would take to move the exposed balance

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

Each of the 10 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 2026-09-30T21:26:49.927Z. 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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