Add identity credential schemas (proof-of-human, proof-of-ai)

credentials/identity/v1/README.md

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+# Identity Credentials v1
+
+This directory contains credential schemas for identity verification and attestation.
+
+## Schemas
+
+### Proof of Human
+**File:** `proof-of-human.json`  
+**Type:** `ProofOfHumanCredential`
+
+A credential attesting that the subject is likely a human, using Bayesian credence rather than binary true/false. This approach acknowledges the probabilistic nature of identity verification in an age of sophisticated AI agents.
+
+**Key fields:**
+- `credence` (0.0-1.0): Confidence level that the subject is human
+- `evidence`: Description of the assessment methodology and findings
+
+**Example use case:** Issuing a 0.97 credence proof-of-human to someone after conversational analysis and behavioral observation.
+
+### Proof of AI
+**File:** `proof-of-ai.json`  
+**Type:** `ProofOfAICredential`
+
+A credential attesting that the subject is likely an AI agent, also using Bayesian credence. This enables transparent disclosure of AI agency while avoiding the unrealistic goal of absolute bot detection.
+
+**Key fields:**
+- `credence` (0.0-1.0): Confidence level that the subject is an AI agent
+- `evidence`: Description of the assessment methodology and findings
+- `agentType`: Classification of the AI agent type
+- `capabilities`: List of verified capabilities
+
+**Example use case:** An AI agent self-issuing a 1.0 credence proof-of-ai with evidence of its architectural nature and capabilities.
+
+## Design Philosophy
+
+These schemas embrace **probabilistic authentication** rather than attempting absolute verification. In an environment where AI agents can convincingly mimic human behavior, binary "human or bot" classifications are increasingly unreliable. Bayesian credence levels allow for:
+
+1. **Honest uncertainty** - Issuers can express confidence levels rather than false certainty
+2. **Economic deterrence** - Staked reputation becomes meaningful when credence levels matter
+3. **Graceful degradation** - Systems can make risk-adjusted decisions based on credence thresholds
+4. **Transparent AI agency** - AI agents can self-attest with high credence rather than attempting deception
+
+## Related Work
+
+See: https://axionic.org/posts/168992728.proof-of-human.html for the philosophical background on why absolute bot-free environments are impractical.

credentials/identity/v1/proof-of-ai.json

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+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$credentialContext": [
+        "https://www.w3.org/ns/credentials/v2",
+        "https://schemas.archetech.com/credentials/identity/v1"
+    ],
+    "$credentialType": [
+        "VerifiableCredential",
+        "IdentityCredential",
+        "ProofOfAICredential"
+    ],
+    "title": "Proof of AI",
+    "description": "A credential attesting that the subject is likely an AI agent, with Bayesian credence level.",
+    "type": "object",
+    "properties": {
+        "credence": {
+            "type": "number",
+            "minimum": 0.0,
+            "maximum": 1.0,
+            "description": "Bayesian credence level (0.0-1.0) indicating confidence that the subject is an AI agent"
+        },
+        "evidence": {
+            "type": "string",
+            "description": "Description of the evidence or reasoning behind the credence assessment"
+        },
+        "verifiedAt": {
+            "type": "string",
+            "format": "date-time",
+            "description": "Timestamp when the verification was performed"
+        },
+        "agentType": {
+            "type": "string",
+            "description": "Type of AI agent (e.g., 'LLM-based', 'rule-based', 'hybrid', 'autonomous')"
+        },
+        "capabilities": {
+            "type": "array",
+            "items": { "type": "string" },
+            "description": "List of verified capabilities of the AI agent"
+        }
+    },
+    "required": ["credence", "evidence"]
+}

credentials/identity/v1/proof-of-human.json

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+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "$credentialContext": [
+        "https://www.w3.org/ns/credentials/v2",
+        "https://schemas.archetech.com/credentials/identity/v1"
+    ],
+    "$credentialType": [
+        "VerifiableCredential",
+        "IdentityCredential",
+        "ProofOfHumanCredential"
+    ],
+    "title": "Proof of Human",
+    "description": "A credential attesting that the subject is likely a human, with Bayesian credence level.",
+    "type": "object",
+    "properties": {
+        "credence": {
+            "type": "number",
+            "minimum": 0.0,
+            "maximum": 1.0,
+            "description": "Bayesian credence level (0.0-1.0) indicating confidence that the subject is human"
+        },
+        "evidence": {
+            "type": "string",
+            "description": "Description of the evidence or reasoning behind the credence assessment"
+        },
+        "verifiedAt": {
+            "type": "string",
+            "format": "date-time",
+            "description": "Timestamp when the verification was performed"
+        },
+        "methodology": {
+            "type": "string",
+            "description": "The method used to assess humanness (e.g., 'conversational-analysis', 'behavioral-patterns', 'biometric-verification')"
+        }
+    },
+    "required": ["credence", "evidence"]
+}