# Proof21 — Brand Identity v1.1

Status: founder-selected direction, recorded 2026-09-06; presentation refresh approved 2026-09-07. Apply this identity to the website, documentation, GitHub presentation, social assets, examples, and partner material. Product claims remain subject to implementation and evidence.

## Name and domains

- Primary name: **Proof21**. Do not insert a space or change capitalization.
- Shorthand: **P21**. This names the project/protocol shorthand, not a live token.
- Primary domain: **proof21.xyz**.
- Reference agent: **Witness**, a proposed first-party interface, not a second company.

## Visual direction

Translate the founder's supplied silver/e-paper device reference into a calm instrumentation aesthetic: neutral e-paper, brushed-aluminum neutrals, charcoal text, fine rules, rounded rectangular controls, generous space, and small signal-orange details. This is a design interpretation, not an identification of the reference's original fonts or a reproduction of its product identity. Do not copy its hardware, logos, meeting names, or product copy.

No purple gradients, neon crypto graphics, glossy token renders, stock finance photography, invented dashboards, or decorative frog imagery in this identity. Preserve a light default appearance. Do not invent a dark theme without review.

## Color tokens

| Token | Hex | Role |
| --- | --- | --- |
| Paper | #F5F5F3 | Main canvas |
| Surface | #FFFFFF | Raised cards and input fields |
| Aluminum | #D6D8D5 | Quiet material accents |
| Line | #D4D6D1 | Decorative separators; not the only indication of an input boundary |
| Ink | #181A18 | Main text and primary buttons |
| Muted | #666A65 | Secondary text and visible control boundaries |
| Signal | #EF5B2A | Small highlights, dots, and decorative brand accents |
| Signal ink | #AD3616 | Accessible orange text and focus indicators on light backgrounds |

Orange is an accent with more intentional presence (roughly 5–8% as a design guide, not a quota): primary CTA, the 21 wordmark accent, diagram nodes, and selected instrument details. Use ink text on signal-orange fills, not small white text. On the paper background, ink has about 16.03:1 contrast, muted 5.04:1, and signal ink 5.80:1; signal orange is about 3.10:1 and is not the default small-text color. Values are calculated from these chosen tokens, not sampled claims about the reference image. Contrast alone is not full accessibility conformance.

## Typography

- **Inter**: wordmark treatment, headings, navigation, body text, and buttons. Body 400; labels 500; headings 500–600. Use tabular numerals in tables.
- **IBM Plex Mono**: code, identifiers, transaction hashes, technical labels, and machine-readable examples. Disable ligatures in copied security-sensitive text.
- **Doto**: visible but selective display numerals and short instrument labels, at large sizes. Original dot-grid SVG glyphs may supply a font-independent identity treatment. Never use for addresses, hashes, financial amounts requiring exact inspection, body copy, or long code.
- Fallbacks: system sans-serif for Inter; system monospace for the other families.

These are selected equivalents for Proof21's direction, not verified names of the fonts in the photograph. Font binaries are not included. Acquire fonts through their official projects and follow their licenses. GitBook and social platforms may not expose every font/color control; preserve the closest supported roles rather than promising pixel-identical rendering everywhere.

## Layout and interaction

Use an 8px spacing rhythm, 1px fine rules, 12px card corners, approximately 8px control corners, and restrained shadows. Aim for 16px or larger body text, comfortable line length, visible keyboard focus, and touch-friendly controls. Muted illustrations loop while visible; the process narrative also responds to scrolling, with a compact mobile composition. Pause media offscreen and in hidden tabs. Honor device reduced-motion and data-saver settings, with a Reduce motion option inside Preferences. Keep a readable static fallback for every illustration and diagram; do not use floating stop or replay controls.

The first human surface is a small website, docs, GitHub, X, and LinkedIn. The machine surface must be actual text, schemas, examples, and executable interfaces, not screenshots.

## Voice and claims

Working descriptor: **Verification for agentic systems.**

Homepage headline: **Agents act. Systems verify.**

Supporting copy: **Proof21 is building a shared verification layer for AI agents and platforms to exchange evidence, evaluate actions, and apply their own policies.**

Lead with Bitcoin-native infrastructure for agentic systems. Describe protocol behavior directly: agents exchange evidence, evaluators produce findings, and consuming platforms apply their own policies. Put released-interface status in the implementation-status page and machine metadata. Keep caveats beside the technical mechanism they qualify, not beneath every illustration. Prefer specification statements over internal tasks or instructions to future developers.

Name the exact claim being checked. Distinguish a signed statement, a reproduced calculation, an independently observed chain fact, and a confirmed timestamp. Never imply that a signature, DMT label, or Bitcoin anchor proves all underlying claims true.

Use attributed marks only to identify referenced projects. Never invent partnerships, adoption, performance, audits, uptime, released packages, live APIs, MCP/A2A endpoints, or token availability. Keep proposed capabilities clearly identified in status and specifications; decorative graphics are not evidence of a live service.

## Change control

`brand/tokens.json` is the machine-readable token source. `brand/tokens.css` mirrors it. Keep both aligned. Update this document when changing names, palette, typography, or voice. Every coding agent must read this file through the repository's `AGENTS.md` before creating public-facing assets.

<!-- p21-ecosystem-payments-v09 -->

## Signal-orange identity

Use signal orange (#EF5B2A) for the entire 21 in header/footer wordmarks and the entire 21 in the dotted P21 motion mark. Keep P/Proof in ink. This branding exception does not change the darker accessible orange used for small text links. Journal listing cards and article illustrations share visible-only video playback, render-derived image recovery, a still fallback and authoritative reduced-motion controls.

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