No. 01 — For licensed professionals In the age of machine drafts

responsible charge receipts for AI-assisted professional files.

ChargeMark creates a timestamped record of responsible charge: who reviewed the file, what AI touched it, what they checked, and when the receipt was created.

The file stays local. The receipt is public. The responsibility is visible.

Issue a Responsible Charge Receipt See how verification works Talk to Roger
Reviewedthe signer declared scope of review.
RecordedPAdES-B-T signature bound to the file bytes.
Traceableledger row, RFC 3161 timestamp, Bitcoin anchor.
AI disclosedtools named and versioned on the receipt.
Untamperedany byte changes and the seal breaks.
who reviewedwhat AI touched itwhat they checkedwhere the evidence liveswho reviewedwhat AI touched itwhat they checkedwhere the evidence lives who reviewedwhat AI touched itwhat they checkedwhere the evidence liveswho reviewedwhat AI touched itwhat they checkedwhere the evidence lives
Chapter I — Why now

a signature says I endorse this.
responsible charge says I reviewed this,
and I am answerable for it.

1850
wet ink on vellum.
Specimen · A Analog ★ STATE OF MICHIGAN · REGISTERED ARCHITECT ★ R O G E R B E R E N T · A I A · # 1 3 0 1 0 5 2 3 8 1 LICENSED ARCHITECT est. 2003
a mark that said “this one’s on me.”
good for a century. not for a laptop.
vs.
2026
PDF exported from an LLM.
Specimen · B Cryptographic
chargemark
cm_ab3f9x · rev 1
Stamped by
roger berent, AIA
MI Arch #1301052381 · Roger Berent Architects, PLLC
WORK26.05 Safe Haven · Rev 1 STAMPED2026-04-24 14:32:10 UTC DRAFTEDClaude Sonnet 4.5 REVIEWEDRoger Berent, AIA — declared full review SHA-2562467ec…58e5
AI nutrition label™◉ on ledger
a ChargeMark that says who reviewed it, what AI touched it,
what they checked, and when.

a responsible charge receipt binds four evidence claims.

cryptographically bound · 2026
01
who reviewed it.
signer, license, firm. in plain text.
02
what AI touched it.
named tools, versions, scope of output.
03
what they checked.
scope of review, against what version.
04
where evidence lives.
Bitcoin-anchored. open internet. no upload.
Chapter II — How it works

issue a receipt.
the file never leaves
your machine.

The licensed professional reviews an AI-assisted file. ChargeMark hashes it locally, writes who reviewed it and what AI touched it to a public ledger, and embeds a ChargeMark on the page. One kilobyte. Zero upload. Permanent.

01 / REVIEW
review.
Licensed professional reviews the AI-assisted file, declares scope, and names the tools that touched it. The receipt starts here.
Local
02 / RECORD
record.
Hash, AI declaration, signer. Written to a public ledger. Not the file. Bitcoin-anchored, open-internet verifiable.
Ledger
03 / VERIFY
verify.
Scan the QR, drop the file. Bytes match, or they don’t.
Browser
04 / SUPERSEDE
supersede.
Issue Rev 2 and Rev 1 turns yellow on the record. Time and answerability, both visible.
Ledger
$ chargemark stamp --in draft.pdf
> error: AI disclosure incomplete.
> --ai-drafted-by and --ai-reviewed-by required.
> Stamp refused.
the gate.
no AI declaration,
no receipt.
Chapter III — The anatomy

every receipt. six answers.

A ChargeMark is a small block of information attached to a file. It answers six questions a reader can verify without opening the file itself.

Chapter IV — The AI Nutrition Label™

the AI nutrition label,
printed on every file.

Borrowed from the grocery aisle. Same idea: if it’s in the file, it’s on the label. Drafted by whom. Reviewed by whom. Scope of review. All cryptographically bound to the PDF bytes -- change any character and the seal breaks.

Drafted by Reviewed by Scope every time you issue a receipt

AI Nutrition Label™

Rev 1
serving: one file, one receipt
Ingredients the three that matter
Drafted byClaude Sonnet 4.5
Reviewed byRoger Berent, AIA
Scope of reviewDeclared full review
Stamped by
SignerRoger Berent, AIA
LicenseMI Arch #1301052381
FirmRoger Berent Architects, PLLC
Ledger record
Receiptcm_ab3f9x
Work26.05 Safe Haven · Rev 1
Timestamp2026·04·24 · 14:32:10 UTC
SHA-2562467ec…58e5

* Percent daily value of human judgment: 100%. No artificial signatures. No autopilot approvals. Every line above is cryptographically signed into the PDF -- change any character and the seal breaks.

Chapter V — The fingerprint

sixty-four characters.
one file, one receipt.

SHA-256 · 26.05 Safe Haven
Rev 1 · 2026·04·24
2467ec0a37a9aa673369ca75c39b9f02d8864c97b7a57252cbcd4476635c58e5

one bit flips.

The whole hash changes. A typo, a moved pixel, a missing comma -- the fingerprint won’t lie.

collision is not the risk.

Substitution is. The hash binds this exact file to this exact receipt. Swap a byte, swap a page, swap the whole PDF, and the hash no longer matches.

this string is the whole claim.

The rest of the page is theater. These 64 characters are the signature.

Chapter VI — Try it live

verify a file.
nothing leaves
your browser.

File bytes stay on your machine. The browser hashes them locally and compares the answer to the public ledger record. Verification is free. Forever. Runs in any browser.

↓

drop a receipted file here

or click to choose a file

No stamped PDF on your laptop? See a live receipt and walk through the same verification path a building official would.

expected
2467ec…58e5
your file
[waiting]
“
when something goes wrong, someone will ask who signed. the answer has to be a person.
-- The first question in every E&O claim, after 2026

AI exclusions are entering commercial liability language. As carriers, boards, owners, and attorneys sort out AI-assisted work, the practical question gets sharper: who was in responsible charge, what did they review, and what record proves it?

In Michigan, professional practice law already recognizes the need for a person in responsible charge. ChargeMark makes that responsibility visible at the file level.

Under the hood

boring, public,
well-worn cryptography.

PAdES-B-T

The PDF signature standard. Every major reader checks it.

ISO 32000-1
RFC 3161

Third-party timestamp. Binds the signing moment to an attested time.

freetsa.org
SHA-256

Local fingerprint of the whole file. 64 characters. No ambiguity.

NIST FIPS 180-4
OpenTimestamps
+ Bitcoin

Public blockchain witness. Every stamp, aggregated into a Bitcoin OP_RETURN transaction. Confirmable by any node, forever.

opentimestamps.org