Quantum solvency · Corporate treasury
Twenty One Capital
Twenty One Capital, Inc. (XXI)
Quantum solvency
99.8%
On-chain total
43,513 BTC
Exposed
88 BTC
Largest exposed key
88 BTC
Scored from Twenty One treasury dashboard, xxi.mempool.space (live), 4 of 13 published addresses read. The addresses read are the largest declared holdings and cover 100.00% of the declared balance; the remainder is dust that cannot move a balance-weighted number. The holder declared 43,513 BTC at its snapshot; the chain shows 43,513 BTC now. The company committed in its 8-K of 8 December 2025 to publishing on-chain proof of its bitcoin holdings at xxi.mempool.space. The wallet endpoint lists every treasury address, including retired ones that now hold nothing. Snapshot .
By exposure class
| Hash-protected (safe until first spend) | 3 addresses | 43,424.74 BTC |
| Reused / spent (key revealed) | 1 address | 88.38 BTC |
Practical risk
An attacker must recover each key separately. 1 exposed key holds 10 BTC or more, 88 BTC in total; that is the part worth attacking first, and the part to sweep to fresh keys first.
| High concentration | 0 keys | 0 BTC |
| Material | 1 key | 88.38 BTC |
| Moderate | 0 keys | 0 BTC |
| Small balance | 0 keys | 0 BTC |
| Not exposed | 3 keys | 43,424.74 BTC |
Largest exposed keys
| Address | Type | Why exposed | Balance |
|---|---|---|---|
| 3MEa4sPyGLCf2x…osJ6UhJh | P2SH | Spent from, key revealed | 88.38 BTC |
Disclosure freshness
Live endpoint. The holder's endpoint was read 20 days ago.
Custody, as observed on-chain
Of the 43,513 BTC in the 13 addresses read, 0% is spent by a single key (indistinguishable from MPC on-chain), 0% through a multisig script, and 100% has never spent, so its control is not yet visible.
| What spends it | Addresses | Balance |
|---|---|---|
| Never spent, control not yet visible | 3 | 43,425 BTC |
| One key (or an MPC wallet, which looks the same on-chain) | 4 | 88 BTC |
| Multisig script 3-of-5: 0 BTC in 6 addresses | 6 | 0 BTC |
Read from 13 of 13 published addresses, holding 43,513 BTC, on 2026-09-30.
Repeated nonces
89 signatures from 10 keys across 10 addresses were checked and no nonce was repeated.
What it would take to move the exposed balance
6 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.
Economy · 1 sat/vB
0.0000 BTC
about $1
Within an hour · 1 sat/vB
0.0000 BTC
about $1
Next block · 2 sat/vB
0.0000 BTC
about $1
Each of the 6 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 2026-09-30T22:38:42.395Z. 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.
<a href="https://latticescan.com/quantum-solvency/twenty-one"><img src="https://latticescan.com/badge/solvency/twenty-one" alt="quantum solvency"></a>
Anchored in Bitcoin
The SHA-256 of this exact snapshot, bb2572e3a5a00f2c28f9a0f8…, was submitted to OpenTimestamps on ; the Bitcoin attestation completes within hours of the stamp and the proof upgrades on the next run. The index is timestamped on the chain it measures. The proof is included in the signed JSON.
This entry is served signed with ML-DSA-65 at /api/quantum-solvency/twenty-one; anyone can verify it. Back to the index.