Crypto tax exposure modeling

See your estimated crypto tax exposure before you sell.

Model a sale, review the assumptions, and export a CPA-ready handoff bundle before you make the move.

Free to create and review · $29 per export

Manual input. No wallet connection. No filing.

Start a SnapshotFree to create · $29  per export
See how it works ↓
Sigil One dashboard showing estimated tax exposure
Estimated tax exposure
$38,111.93
See the likely tax impact before the sale becomes irreversible.
How it works

Three steps to a CPA-ready export.

01
Estimate Exposure
Enter the sale details and review the estimated tax impact before you act. Every assumption is visible and editable.
02
Lock the Scenario
Preserve the assumptions and result as a sealed snapshot. Once locked, the record cannot be altered.
03
Export for Review
Download an 11-file handoff bundle led by a README. Your accountant opens it, follows the hierarchy, and never needs access to Sigil One.
Sigil One tax exposure modeling
What you get

An 11-file handoff bundle, led by a README.

Every paid export delivers the same set of files. Your CPA opens the README first, then works through the report, the ledger, and the supporting files in order. Nothing in the bundle requires access to Sigil One.

sigil_one_export.zip11 files
README.txtOrientation surface. Handoff hierarchy.Start here
SigilOne_Report.pdfHuman-readable report.
sigil_report.txtPlain-text report.
explanation_narrative.txtWhat the numbers mean, in plain language.
transaction_ledger.csvModeled transaction record.
exposure_summary.csvExposure totals and breakdown.
tax_assumptions.txtAssumptions used in the model.
SigilOne_Assumptions.txtAssumption snapshot for review.
SigilOne_Notes.txtContext notes for the scenario.
SigilOne_Export.csvExport data for spreadsheet review.
MANIFEST.jsonVerification manifest.Verifiable
Integrity

Every exported scenario keeps a verifiable record.

Verified Scenario Snapshots

Each snapshot preserves the assumptions, modeled result, and full context of the scenario you ran. You can verify the record hasn't changed at any time after export.

Under the hood, a SHA-256 checksum chain links every snapshot to the one before it, creating a tamper-evident history. The verification screen confirms integrity on demand, and green means intact.

MANIFEST.jsonintegrity verified ✓
Sigil One snapshot verification showing chain integrity pass
By design

You control every assumption.

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

Every number in the system was entered by you, reviewed by you, and confirmed by you. No wallet connections. No imported transaction noise. Every assumption is visible before export.

Sigil One is not tax filing software. It does not generate forms, connect to exchanges, or claim to know what you owe. It estimates the exposure, preserves the scenario, and gives your CPA something concrete to review.

Context

Broader holdings for context.

Track your wider portfolio alongside the sale scenario you modeled, so the full picture is available when you or your CPA need it.

Sigil One holdings overview
Pricing

Snapshots are free. You only pay when you export.

Founder's Launch Price
$29
per export
Create and review snapshots. Always free.
Snapshot export ($29). README-led 11-file handoff bundle with PDF report, ledger, exposure summary, assumptions, and verification manifest.
Holdings export ($29). Unified PDF of your portfolio holdings, purchased separately.
Verifiable record you can check at any time. No export required.
No subscription. Pay only when you export
Start a Snapshot
Common questions

What Sigil One does, and does not do.

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 does it cost?
Creating and reviewing snapshots is free. You only pay when you export. Each export is $29. The snapshot export gives you an 11-file handoff bundle led by a README, including a PDF report, transaction ledger, exposure summary, tax assumptions, explanation narrative, and a verification manifest. The holdings export gives you a unified PDF of your portfolio holdings. These are separate purchases.
Can my CPA use the export without the app?
Yes. Both the snapshot export bundle and the holdings PDF are self-contained. Your accountant can review the data without ever accessing Sigil One.

Model the sale before you make it.

Estimate the exposure, preserve the record, and export a CPA-ready handoff bundle.

Start a Snapshot
See how it works ↑