Deterministic tax exposure modeling

Understand the tax consequence before you sell crypto.

Sigil One estimates the tax exposure of a potential crypto sale and preserves the scenario as a verified snapshot - so the decision state is never lost.

For crypto holders considering a sale, and the CPAs reviewing the consequences.

Start a Snapshot $29  per snapshot
Sigil One dashboard showing estimated tax exposure
Estimated tax exposure
$1,523,289.30
Know this number before you act - not after.
System

Three operations. One verified outcome.

01
Estimate Exposure
Model the projected tax impact of a potential crypto sale before making the move. Manual input. Visible assumptions. No hidden automation.
02
Preserve the Scenario
Save the assumptions and modeled outcome as an immutable snapshot. Each snapshot is chained with a SHA-256 checksum - the decision state cannot be altered after the fact.
03
Export the Worksheet
Generate a CPA-ready export bundle with the scenario context attached. Your accountant can validate the result without ever accessing the application.
Workflow

From uncertainty to verified record.

01
Enter your holdings
Input cost basis lots manually. Sigil One never connects to wallets or exchanges - your data stays with you.
02
Model the sale
Set the scenario - sale price, quantity, disposal method. The system calculates short-term and long-term exposure instantly.
03
Seal and export
Review assumptions, create the snapshot, unlock the export. The snapshot enters the chain and cannot be modified - ever.
Integrity

Every scenario is cryptographically sealed.

Verified Decision Snapshots

Each snapshot records the assumptions, result, and context of the modeled sale. A SHA-256 checksum chain links every snapshot to the one before it - creating an auditable, tamper-evident history of decision states.

The verification screen confirms chain integrity in real time. Green means intact. It's the same principle that secures blockchain transactions - applied to the decision that precedes one.

Manifest Hash a3f8c2e1b7d94a6f... verified ✓
Sigil One snapshot verification showing chain integrity pass
Doctrine

Manual input by design.

✓ Visible assumptions
✓ Manual input by design
✓ Immutable scenario snapshots
✓ CPA-ready export bundles
✓ No wallet connection required
✓ No filing claims
✓ No form generation

Manual input is intentional. Sigil One prioritizes clarity and explicit assumptions over hidden automation. Every number in the system was entered by you, reviewed by you, and confirmed by you.

This is not a tax filing tool. It does not generate forms, connect to exchanges, or make claims about what you owe. It shows you the exposure - clearly, deterministically - and preserves the scenario so the decision state is never lost.

Pricing

$29 per snapshot. No subscription.

Founder's Launch Price
$29
one snapshot - one export - one price
Modeled tax exposure for one simulated sale
Immutable snapshot sealed with SHA-256 chain integrity
CPA-ready export bundle - CSV, assumptions, manifest
Cryptographic verification of the decision state
No subscription - pay per scenario, only when you need it
Start a Snapshot
Common questions

What Sigil One is - and is not.

Is this tax filing software?
No. Sigil One estimates exposure. It does not file taxes, generate official forms, or make claims about what you owe.
Do I need to connect a wallet or exchange?
No. All input is manual. Sigil One never connects to wallets, exchanges, or any external financial system.
What do I get for $29?
One modeled tax exposure scenario, preserved as an immutable snapshot, with a full CPA-ready export bundle - CSV, assumptions document, and verification manifest.
Can my CPA use the export without the app?
Yes. The export bundle is self-contained. Your accountant can review the modeled scenario, assumptions, and verification data without ever accessing Sigil One.

Get clarity before you act.

Sigil One is built for the moment uncertainty becomes expensive.

Start a Snapshot