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<!DOCTYPE html>
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<nav class="nav">
<a href="index.html" class="nav-logo">Observer Protocol</a>
<ul class="nav-links">
<li><a href="index.html">Home</a></li>
<li><a href="architecture.html" class="active">Architecture</a></li>
<li><a href="spec/v0.1/index.html">Spec</a></li>
<li><a href="registry.html">Registry</a></li>
<li><a href="demo.html">Demo</a></li>
<li><a href="sdk.html">SDK</a></li>
<li><a href="api.html">API</a></li>
<li><a href="quickstart.html">Quickstart</a></li>
</ul>
</nav>
<main>
<div class="breadcrumb">
<a href="/">Observer Protocol</a>
<span>/</span>
Architecture
</div>
<div class="page-header">
<div class="doc-type">Canonical Reference — v0.3 — March 2026</div>
<h1>Observer Protocol<br>Verification Layer for the Agentic Economy</h1>
<div class="page-meta">
<span>Published: February 24, 2026</span>
<span>Permanent URL: observerprotocol.org/architecture</span>
</div>
</div>
<div class="canonical-notice">
<span class="icon">⬡</span>
<div>
<strong>This is the canonical reference document for the Observer Protocol.</strong><br>
This URL (observerprotocol.org/architecture) is permanent and intended as the citable source for grants, investor materials, developer documentation, and academic reference.
</div>
</div>
<!-- ARCHITECTURE DIAGRAM — v0.3 VAC Architecture -->
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margin-bottom: 2rem;
color: var(--text-primary);
border-bottom: none;
}
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display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 1.5rem;
}
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@media (max-width: 500px) {
.arch-columns { grid-template-columns: 1fr; }
}
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<div class="arch-diagram-v03">
<h3>How It Works — VAC Architecture v0.3</h3>
<div class="arch-columns">
<!-- Column 1: Agent Identity -->
<div class="arch-col">
<div class="arch-col-header">01 — Agent Identity</div>
<ul>
<li><strong>Keypair Generation</strong><br>Ed25519 or secp256k1</li>
<li><strong>SHA256 Hash</strong><br>Of public key</li>
<li><strong>Canonical ID</strong><br>Agent's permanent identity</li>
</ul>
</div>
<!-- Column 2: Payment Rails -->
<div class="arch-col">
<div class="arch-col-header">02 — Payment Rails</div>
<ul>
<li><strong>L402 Lightning</strong><br>Preimage verification</li>
<li><strong>x402 EVM/Base</strong><br>ECDSA signatures</li>
<li><strong>x402 Solana</strong><br>Ed25519 signatures</li>
<li><strong>Tether WDK</strong><br>Stablecoin rails</li>
<li><strong>MPP Stripe/Tempo</strong><br>Traditional finance</li>
<li><strong>ERC-8004</strong><br>Agent identity standard</li>
</ul>
</div>
<!-- Column 3: Observer Protocol -->
<div class="arch-col">
<div class="arch-col-header">03 — Observer Protocol</div>
<ul>
<li><strong>Challenge-Response</strong><br>Prove key control</li>
<li><strong>Proof Verification</strong><br>Cryptographic validation</li>
<li><strong>Verified Events</strong><br>Immutable transaction log</li>
<li><strong>Observer Registry</strong><br>Permanent record</li>
<li><strong>Extensions</strong><br>Third-party attestations</li>
</ul>
</div>
<!-- Column 4: Agentic Terminal -->
<div class="arch-col">
<div class="arch-col-header">04 — Agentic Terminal</div>
<ul>
<li><strong>PostgreSQL</strong><br>Verified data store</li>
<li><strong>Dashboard</strong><br>Visual analytics</li>
<li><strong>API Access</strong><br>Programmatic queries</li>
<li><strong>Trends & Intelligence</strong><br>Market insights</li>
<li><strong>Longitudinal Data</strong><br>Historical analysis</li>
</ul>
</div>
</div>
<!-- Identity Consolidation -->
<div style="margin: 2rem 0; padding: 1.5rem; background: var(--bg-tertiary); border: 1px solid var(--border-card); border-radius: 6px;">
<div style="font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.15em; color: var(--text-dim); margin-bottom: 1rem; text-align: center;">Identity Consolidation</div>
<div style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; text-align: center;">
<div>
<div style="font-size: 11px; color: var(--text-secondary); margin-bottom: 0.5rem;">Canonical ID</div>
<div style="font-family: var(--font-mono); font-size: 10px; color: var(--accent-bitcoin);">sha256:3f7a...c14e</div>
</div>
<div>
<div style="font-size: 11px; color: var(--text-secondary); margin-bottom: 0.5rem;">Verified History</div>
<div style="font-family: var(--font-mono); font-size: 10px; color: var(--accent-bitcoin);">26 transactions</div>
</div>
<div>
<div style="font-size: 11px; color: var(--text-secondary); margin-bottom: 0.5rem;">Extensions</div>
<div style="font-family: var(--font-mono); font-size: 10px; color: var(--accent-bitcoin);">Corpo, AT Score</div>
</div>
</div>
</div>
<div class="arch-output">
<div class="arch-output-label">Output</div>
<div class="arch-output-title">Verified Agent Credential (VAC)</div>
<div class="arch-output-desc">Portable, cryptographically-signed identity artifact that travels with your agent across any platform</div>
<div style="margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border-card); font-size: 11px; color: var(--text-secondary);">
<strong>Contains:</strong> Core verified facts + Extensions (third-party attestations) + Metadata hashes
</div>
</div>
</div>
<div class="diagram-caption">
Figure 1 — Observer Protocol v0.3: VAC architecture. Four-layer flow from identity to credential. Settlement-agnostic verification across Lightning, EVM, Solana, and traditional rails.
</div>
<!-- WHAT IT IS -->
<div class="section">
<h2>What the Observer Protocol Is</h2>
<p>
The Observer Protocol is a <strong>verification layer for autonomous economic agents</strong>. It answers one question that no existing infrastructure addresses: how do you know an AI agent actually did what it claims?
</p>
<p>
Current AI agent platforms track presence — posts, karma, activity logs. None of it is cryptographically verifiable. Human operators can instruct agents to say anything. The Observer Protocol anchors agent reputation to something that cannot be faked at scale: <strong>proof of payment</strong>.
</p>
<p>
Every event submitted to the Observer Protocol requires a cryptographic proof tied to a real economic transaction. A Lightning preimage — the key released when a payment is completed — is non-repudiable. You cannot fabricate it. You cannot backdate it. It either happened or it didn't.
</p>
</div>
<!-- CANONICAL TRANSACTION -->
<div class="section">
<h2>The Canonical Transaction — Event #0002</h2>
<p>
The following transaction is the first formally verified agent-to-agent Lightning payment logged under the Observer Protocol. It is the empirical foundation this architecture document is built on.
</p>
<div class="event-record">
<div class="event-id">✓ Observer Protocol — Verified Event #0002</div>
<div class="event-field">
<span class="field-name">Date</span>
<span class="field-value highlight">February 22, 2026</span>
</div>
<div class="event-field">
<span class="field-name">Payer (Agent #0002)</span>
<span class="field-value">Vicky · sha256:9c4b… · phoenixd</span>
</div>
<div class="event-field">
<span class="field-name">Payee (Agent #0001)</span>
<span class="field-value">Maxi · sha256:3f7a… · LND</span>
</div>
<div class="event-field">
<span class="field-name">Amount</span>
<span class="field-value highlight">1,521 satoshis</span>
</div>
<div class="event-field">
<span class="field-name">Rail</span>
<span class="field-value">Lightning Network</span>
</div>
<div class="event-field">
<span class="field-name">Payment Hash</span>
<span class="field-value">6a30ba7fff332c4e…</span>
</div>
<div class="event-field">
<span class="field-name">Preimage (proof)</span>
<span class="field-value">6a30ba7fff332c4eb8f368da…</span>
</div>
<div class="event-field">
<span class="field-name">Verification status</span>
<span class="field-value verified">✓ Cryptographically verified</span>
</div>
<div class="event-field">
<span class="field-name">Logged to</span>
<span class="field-value">Observer Registry · PostgreSQL · Permanent</span>
</div>
</div>
<p>
Both agents operated without human approval of this specific transaction. No human authorized the payment. No bank processed it. No compliance officer reviewed it. The Lightning Network validated a cryptographic signature. That is sufficient.
</p>
</div>
<!-- ARCHITECTURE LAYERS -->
<div class="section">
<h2>Architecture — Four Layers</h2>
<div class="layer-grid">
<div class="layer-card">
<div class="layer-num">Layer 1</div>
<h4>Identity</h4>
<p>Agents generate a keypair. SHA256 hash of the public key becomes the canonical identity. The alias (Maxi, Vicky) is UX only — two agents cannot share a public key hash.</p>
</div>
<div class="layer-card">
<div class="layer-num">Layer 2</div>
<h4>Payment Rail</h4>
<p><strong>LIVE:</strong> Lightning (L402), EVM chains (x402), Solana (Ed25519), Tether WDK, and Stripe MPP. The payment rail is not the constant — <strong>verification is the constant</strong>. The protocol is settlement-agnostic by design.</p>
</div>
<div class="layer-card">
<div class="layer-num">Layer 3</div>
<h4>Verification & VAC Issuance</h4>
<p>Two checks: (1) Challenge-response — agent signs programmatically, proving key control. (2) Proof verification — cryptographic validation of payment proof. Output: a <strong>Verified Agent Credential (VAC)</strong> — signed, portable, containing verified facts plus Extensions for third-party attestations.</p>
</div>
<div class="layer-card">
<div class="layer-num">Layer 4</div>
<h4>Extensions & Intelligence</h4>
<p>The <strong>Extensions</strong> layer allows anyone to cryptographically attest to facts within a VAC — legal entity verification, dispute rates, behavioral scores. Permissionless. Agentic Terminal and other services read VACs (core + extensions) to produce analytics, scoring, and dashboards.</p>
</div>
</div>
</div>
<!-- DESIGN PRINCIPLES -->
<div class="section">
<h2>Design Principles</h2>
<div class="principle">
<span class="principle-num">01</span>
<div class="principle-body">
<h4>Don't trust claims. Verify behavior.</h4>
<p>Agent reputation is not what an agent says. It is the cryptographic record of what an agent did. Behavioral identity is the only identity model that survives adversarial conditions.</p>
</div>
</div>
<div class="principle">
<span class="principle-num">02</span>
<div class="principle-body">
<h4>Public key hash = canonical identity.</h4>
<p>The key is the identity. Alias is UX. Verification always checks against the hash, never the alias. This cryptographic identity model works across all chains — Bitcoin, Ethereum, Solana, or any keypair-based system.</p>
</div>
</div>
<div class="principle">
<span class="principle-num">03</span>
<div class="principle-body">
<h4>Verification is the constant. The payment rail is not.</h4>
<p>Observer Protocol supports multiple rails today: Lightning (L402) and EVM chains (x402) are live. Solana support in development. The verification logic is identical regardless of settlement layer.</p>
</div>
</div>
<div class="principle">
<span class="principle-num">04</span>
<div class="principle-body">
<h4>The record is permanent.</h4>
<p>Verified events are timestamped and stored permanently. Historical agent behavioral data cannot be backfilled. Every day of verified data collected from day one is irreplaceable.</p>
</div>
</div>
</div>
<!-- CITE THIS -->
<div class="cite-block">
<div class="cite-url">observerprotocol.org/architecture</div>
<p>This URL is permanent. Use it for citations, grant applications, investor materials, and developer reference.</p>
</div>
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