Quantum solvency · Corporate treasury

Metaplanet

Metaplanet Inc. (TSE: 3350)

Scored from Metaplanet treasury dashboard, metaplanet.mempool.space (live), 47 of 82 published addresses read. The addresses read are the largest declared holdings and cover 99.96% of the declared balance; the remainder is dust that cannot move a balance-weighted number. The holder declared 43,000 BTC at its snapshot; the chain shows 42,982 BTC now. Public treasury dashboard announced by the company in December 2024. The wallet endpoint lists every treasury address, including retired ones that now hold nothing. Snapshot .

By exposure class

Practical risk

An attacker must recover each key separately. 43 exposed keys hold 10 BTC or more, 35,157 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 39,360 BTC in the 54 addresses read, 78% is spent by a single key (indistinguishable from MPC on-chain), 0% through a multisig script, and 20% has never spent, so its control is not yet visible.

Read from 54 of 82 published addresses, holding 39,360 BTC, on 2026-09-30.

Repeated nonces

489 signatures from 49 keys across 49 addresses were checked and no nonce was repeated.

What it would take to move the exposed balance

48 unspent outputs in 1 transaction, about 0.0000 BTC in fees at the one-hour rate (about $4 at today’s price), using well under one percent of a day’s block space.

Each of the 48 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 2026-09-30T22:32:48.863Z. 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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