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SIGIL (SIJ-il), from the Latin sigillum, a seal.

Say it once.
It stays said.

A monitored message channel for co-parents whose court order calls for one. Once sent, a message can't be edited or deleted in the app, and any change to the record is detectable.

Every message screened by Super Intelligence (SI), before it's sent.

When SI screening is on, every outgoing message is checked against the order before it's sent. Both parents turn it on together, or the court sets it. Fixed checks run either way. SI never writes or rewrites your words, and SIGIL never stores unsent drafts.

Super Intelligence (SI) is the official U.S. term, since September 22, 2026, for what used to be called artificial intelligence. What is SI?

Join the waitlist See how a record is checked

Watch the 6-minute explainer · Try the demo (synthetic data)

Screening is automated and can be wrong. You remain responsible for what you send.

IN DEVELOPMENTJOIN THE WAITLIST

What SIGIL does

Calm on a phone. Exact on the record.

SIGIL is a monitored communication channel for high-conflict family matters. It helps keep the conversation to the case, and keeps one honest record for both sides.

Messages that stay put

Sent messages can't be edited or deleted in the app. Sent and first-viewed times are kept, with subjects, threads and attachments, the same for both of you.

A check before you send, by Super Intelligence

SIGIL's fixed checks run on every message. When both parents turn it on, or the court sets it, SI also checks each outgoing message against your order's terms before it's sent. You see what it flagged and decide what to do. You remain responsible for what you send.

A record anyone with a receipt can check

Every message is chained to the one before it, and signed checkpoints go to both parties. A records custodian, chosen by the parties or the court, is planned. Only fingerprints are checked. Your words are never published.

Reports for the court. Read-only for professionals.

Judges receive message reports with the verification printed on the page. GALs, parenting coordinators, mediators and attorneys can be given read-only access.

Super Intelligence (SI) screening

Keep it to the case. Keep it on the record.

Before a message goes, SIGIL checks it against the communication terms in your order. Fixed checks run on every draft. When SI screening is on, SI reads the draft too. It holds a message that may cross the order's lines before it's sent, and flags potential issues for you to decide. It never writes or rewrites your message, and it never makes a finding about you.

SI screening is on only if both parents agree, or if the court sets it. SIGIL never stores unsent drafts.

  • Not sent

    If a message may include something your order does not allow, SIGIL's fixed checks or SI hold it before it's sent and show you which term. The draft isn't saved.

  • Your decision

    If SI flags a message as possibly off-topic, you can edit it, or add the case reason and send.

  • Just for you

    Optional style tips, never shown to the other parent.

The record

Every message, fastened to the last

SIGIL keeps an append-only log. Each message carries a fingerprint of the one before it, so changing or removing one breaks every link after it.

  1. Chained

    Every message is hash-chained to the one before it, in the order it was sent.

  2. Checkpointed

    At regular intervals, SIGIL signs a checkpoint: one short fingerprint for the whole record so far.

  3. Held by others

    Signed checkpoints go to both parties, so a rewrite of history, even by SIGIL, shows when the record is checked against a copy held outside SIGIL. Planned: a records custodian the parties or the court choose, holding a copy too.

  4. Anchored

    Checkpoints are timestamped by independent timestamp authorities and anchored to the Bitcoin blockchain through OpenTimestamps. Only fingerprints are anchored, never content.

How three messages become one checkpointDEMO
  1. M-00000511:30 AM
    Did the signed copy of the agreement reach you?
    b49e ced5 … 29f9 95fd
  2. M-00000612:48 PM
    Yes, it arrived today. Thank you for sending it.
    fa5e 7b27 … 7cd9 d730
  3. M-0000072:40 PM
    Good. Thanks for confirming.
    fd77 9a76 … 1d8b 62b7
  4. CHECKPOINT 000421 · 3:00 PM · SIGNED
Both partiesEach gets the same signed checkpoint.
A records custodianPlanned. Chosen by the parties or the court, to hold a copy SIGIL can't take back.
Timestamp authoritiesIndependent services confirm the time.
OpenTimestampsAnchored to Bitcoin. Fingerprints only.

A wax seal never stopped anyone from opening a letter. It showed whether someone had.

SIGIL takes its name from the sigillum, the small seal pressed into wax to close a letter. The record works the same way: it doesn't claim nothing can change. It makes any change detectable. Read how the record is kept

Check a record

Proof you can check, not proof you have to trust.

You write it. SIGIL keeps it. Anyone with the receipt can check it. Only fingerprints are checked. Your words are never published.

A check shows whether the record has changed since a checkpoint you hold. It doesn't show who typed a message. Try it on a sample record made for this page. This page uses a demo format, and the check runs in your browser.

Open the full check
Not checked yet
Press “Check the sample record”. The root printed below is the checkpoint the parties hold.

This receipt checks the record. It does not judge what the message says, and it does not show who typed it.

RECORDDEMO export · 7 messages
CHECKPOINT000421 · 2026-10-03 19:00:00Z
ROOT5efb f8a3 … 6517 004c
RESULTNot checked yet

Fairness

Two sides. One record.

The same words for both parents

Every prompt, label and notice reads the same for both of you. SIGIL doesn't take sides, and never says anything about a person.

The same record for both parents

You both see the same messages, times and checkpoints. Neither of you can change them in the app, and a change by anyone, SIGIL included, shows when the record is checked against a copy held outside SIGIL.

Fair, plain-language terms

Terms written to be read in one sitting. They are in draft and will be published before launch. Read the plain-language terms

Who it's for

For everyone who reads the record

Parents

A calmer way to handle the practical things, from receipts to documents, when an order says it has to be in writing.

For families

Attorneys

Message reports that use familiar, plain labels, with the verification printed on the page.

For attorneys

Neutrals

GALs, parenting coordinators and mediators: read-only for the case. You see the record. You can't change it. Every view is logged.

For neutrals

Waitlist

Join the waitlist

SIGIL is in development, and not yet in use. Every demonstration on this site uses synthetic data: fictional people, fictional orders. Join the waitlist to show your interest.

  • No marketing list. What you enter is used only for this waitlist.
  • Nothing to install yet, and nothing to pay.
I am

For now, joining opens your email app with a short note ready to send. Nothing is sent until you send it.

Please don't include anything about your case.

The AVOWAL family

One family. Each shows its work.

AVOWAL is the platform. APPARITOR is built to put service of process on the record. SIGIL is built to keep the messages. One grammar, three inks.

AVOWAL

The platform.Legal operations. Independent licensed attorneys and ELARIA. avowal.ai

APPARITOR

The officer serves. We prove it.Service of process by licensed officers, on the record. In development.

SIGIL

Say it once. It stays said.A monitored channel for co-parents. In development.