How it works
You write it. SIGIL keeps it.
Anyone with the receipt can check it. Only fingerprints are checked. Your words are never published.
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Step 1
Your order sets the terms
When a channel is set up, the communication terms in your order are entered once. They sit at the top of every thread, and both parents see the same words.
What each parent sees at the top of a thread DEMO
Your order: shared expenses and documents only. SIGIL checks each message against it.Orders word their terms in different ways. SIGIL uses the words of your order, not its own.
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Step 2
A check before you send, by Super Intelligence
SIGIL's fixed checks run on every draft. Super Intelligence (SI) screening adds a second check: SI reads each outgoing message against those terms before it's sent. Both parents turn it on together; if either says no, both get the fixed checks only. In a court-ordered setting, the court sets it. SI holds a message that may cross the order's lines, flags potential issues for you to decide, and never writes or rewrites your words. Try it with five sample drafts.
Super Intelligence (SI) is the official U.S. term, since September 22, 2026, for what used to be called artificial intelligence. Where SI screening is on, SIGIL uses a current SI model to check every outgoing message against the order before it's sent. What is SI?
SIGIL never stores unsent drafts. Screening is automated and can be wrong. You remain responsible for what you send.
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Step 3
Sent, and it stays said
Once sent, a message can't be edited or deleted in the app. Both of you see when it was sent and when it was first viewed. A correction is a new message, and the original stays.
What the sender sees after sending DEMO
- Sent at 2:40 PM. It can't be edited or deleted in the app.
- Recorded. Joins the next signed checkpoint at 3:00 PM.
- First viewed at 2:52 PM.
- In checkpoint 000421, as message 7.
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Step 4
Signed, held, anchored
At regular intervals, SIGIL signs a checkpoint that covers every message so far. Signed checkpoints go to both parties. A records custodian the parties or the court choose is planned.
Checkpoints are timestamped by independent timestamp authorities and anchored to the Bitcoin blockchain through OpenTimestamps. Only fingerprints are anchored, never content.
Planned: a checkpoint every hour while messages are being sent, and one at the close of each day.
Both parties
The same signed checkpoint, so neither side depends on the other's copy.
A records custodian
Planned. Chosen by the parties or the court. A copy held outside SIGIL, which SIGIL can't take back.
Timestamp authorities
Independent services that confirm each checkpoint existed by a certain time.
OpenTimestamps
Anchored to the Bitcoin blockchain through OpenTimestamps. Fingerprints only.
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Step 5
Read, report, check
Judges receive message reports with the verification printed on the page. GALs, parenting coordinators, mediators and attorneys can be given read-only access. Anyone with a receipt can check it. Only fingerprints are checked.
Two sides. One record.
Both parents, and every professional with access, read the same messages, times and checkpoints. Any change to the record shows when it is checked against a copy held outside SIGIL.
What is kept
What SIGIL keeps, and what it never keeps
Kept, for both of you
- Every sent message, in the words that were sent, with its fingerprint
- Subjects, threads and attachments
- Sent and first-viewed times
- A case reason, when a sender adds one
- Signed checkpoints and receipts
- A log of every professional view
Never kept
- Unsent drafts
- Messages SIGIL held back
- Style tips
Screening results, including anything SI flagged, are shown only to the person writing, before they send. They never appear on the shared message, a receipt or a report.
Proposed, not promised
Ideas still being tested
Some features are proposals. They are labelled that way here, and they won't be described as part of SIGIL until they are built.
Say it once. It stays said.
In development. Join the waitlist.