Quantum solvency · Exchange
Backpack
Backpack Exchange (published wallet list)
Quantum solvency
0.0%
On-chain total
373 BTC
Exposed
373 BTC
Largest exposed key
285 BTC
Scored from Backpack public wallets endpoint (2026-09-30), 6 of 6 published addresses read. A documented endpoint listing every configured wallet address, without balances. Balances are read from the chain. Snapshot .
By exposure class
| Reused / spent (key revealed) | 5 addresses | 284.83 BTC |
| Taproot (exposed by design) | 1 address | 88.2 BTC |
Practical risk
An attacker must recover each key separately. 2 exposed keys hold 10 BTC or more, 373 BTC in total; that is the part worth attacking first, and the part to sweep to fresh keys first.
| High concentration | 1 key | 284.83 BTC |
| Material | 1 key | 88.2 BTC |
| Moderate | 0 keys | 0 BTC |
| Small balance | 0 keys | 0 BTC |
| Not exposed | 4 keys | 0 BTC |
Largest exposed keys
| Address | Type | Why exposed | Balance |
|---|---|---|---|
| bc1qlt7ywmpuuc…gstjcmtg | P2WSH | Spent from, key revealed | 284.83 BTC |
| bc1pmrsvpcv8k5…esjzfyea | P2TR | Taproot, key in output | 88.2 BTC |
| bc1q9s5nsztmqh…xsjz67tq | P2WSH | Spent from, key revealed | 0 BTC |
| bc1q26ppn4pvrh…6sj3nza5 | P2WSH | Spent from, key revealed | 0 BTC |
| bc1qvr4zq5avcm…jquh5ttn | P2WSH | Spent from, key revealed | 0 BTC |
| bc1q0gw7fexuwt…fqfjv42k | P2WSH | Spent from, key revealed | 0 BTC |
Disclosure freshness
Published this month. Read from a publication dated 2026-09-30, 19 days ago.
Custody, as observed on-chain
Of the 373 BTC in the 6 addresses read, 0% is spent by a single key (indistinguishable from MPC on-chain), 76% through a multisig script, and 0% has never spent, so its control is not yet visible.
| What spends it | Addresses | Balance |
|---|---|---|
| Multisig script 3-of-5: 285 BTC in 3 addresses · 3-of-4: 0 BTC in 1 address · 2-of-4: 0 BTC in 1 address | 5 | 285 BTC |
| Taproot key path (one signature, possibly aggregated) | 1 | 88 BTC |
Read from 6 of 6 published addresses, holding 373 BTC, on 2026-09-30.
Repeated nonces
116 signatures from 6 keys across 6 addresses 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
3 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.
Economy · 1 sat/vB
0.0000 BTC
about $0
Within an hour · 1 sat/vB
0.0000 BTC
about $0
Next block · 2 sat/vB
0.0000 BTC
about $1
Each of the 3 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 2026-09-30T20:56:11.081Z. 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/backpack"><img src="https://latticescan.com/badge/solvency/backpack" alt="quantum solvency"></a>
Anchored in Bitcoin
The SHA-256 of this exact snapshot, 500a45eb8053944e06457e94…, 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/backpack; anyone can verify it. Back to the index.