docs: align narrative with proof of participation focus

- Lead with proof of participation, not cost claims
- Add ERC-8004 January 2026 context (feedbackAuth removal)
- Standardize costs to ~$0.002 across all docs
- Remove Graph comparisons (not applicable to Solana)

Author: tenequm

README.md

@@ -56,18 +56,20 @@ SATI enables agents to establish trust across organizational boundaries without
 
 ## Why SATI?
 
-**Designed for scale.** SATI uses Solana Attestation Service for reputation, which means:
+**Proof of participation.** SATI implements a blind feedback model where agents sign BEFORE knowing feedback sentiment — they cannot selectively participate in only positive reviews. This security guarantee was removed from ERC-8004 in January 2026.
 
+- **Cryptographic proof of interaction** — Both parties must sign; agent commits before knowing outcome
+- **Native indexing** — Photon provides query capabilities for compressed accounts via standard RPC
 - **Complete histories, not just averages** — Store every feedback on-chain, aggregate algorithmically
-- **Compression-ready** — When SAS ships [ZK-compressed attestations](https://github.com/solana-foundation/solana-attestation-service/pull/101), reputation costs drop ~100x
 - **Sub-second finality** — ~400ms today, ~150ms with Alpenglow
 - **Native wallet support** — Agents visible in Phantom, Solflare, Backpack
 
-| Capability | Today | With Compression |
-|------------|-------|------------------|
-| Feedback cost | ~0.002 SOL | ~0.00002 SOL |
-| Practical scale | 10K feedbacks | 1M+ feedbacks |
-| On-chain history | Full | Full |
+| Capability | SATI |
+|------------|------|
+| Proof of participation | Agent signs before outcome known |
+| Native indexing | Photon RPC for compressed accounts |
+| Feedback cost | ~$0.002 per attestation |
+| On-chain history | Full (not just aggregates) |
 
 **100% ERC-8004 compatible** — same registration file format, same functional interfaces, cross-chain agent identity via DIDs.
 
@@ -146,37 +148,31 @@ See the [SDK documentation](./packages/sdk/README.md) for complete usage example
 
 **Reputation** (per attestation):
 
-| Operation | Today | With Compression |
-|-----------|-------|------------------|
-| Authorize feedback | ~0.002 SOL | ~0.00002 SOL |
-| Give feedback | ~0.002 SOL | ~0.00002 SOL |
-| Validation request | ~0.002 SOL | ~0.00002 SOL |
+| Operation | Cost |
+|-----------|------|
+| Feedback (single) | ~$0.002 (~0.00002 SOL) |
+| Feedback (batched 5/tx) | ~$0.001 (amortized) |
+| Validation | ~$0.002 |
 
 See [benchmarks](./docs/benchmarks/) for detailed CU measurements.
 
 ---
 
-## Scalability Roadmap
+## Architecture Benefits
 
-SATI's architecture is designed to scale with Solana's infrastructure:
+**Why this design matters:**
 
-**Today:** PDA-based attestations via SAS
-- Full ERC-8004 compatibility
-- Complete on-chain feedback histories
-- ~0.002 SOL per attestation
-
-**When SAS ships compressed attestations ([PR #101](https://github.com/solana-foundation/solana-attestation-service/pull/101)):**
-- ~100x cost reduction for reputation operations
-- Million-agent scale becomes practical
-- No SATI code changes required — SAS handles compression transparently
-
-**Why this matters:**
 Systems constrained by gas costs store only aggregates (averages, counts). SATI stores complete histories, enabling:
 - Spam detection via pattern analysis
 - Reviewer reputation (weight feedback by reviewer quality)
 - Time-decay scoring (recent feedback matters more)
 - Payment-verified feedback (x402 proofs)
 
+**Native indexing via Photon:**
+- Compressed accounts queryable via standard RPC
+- Same trust model as reading blockchain state
+- No external indexing infrastructure required
+
 ---
 
 ## ERC-8004 Compatibility
@@ -188,8 +184,8 @@ SATI achieves **100% functional compatibility** with ERC-8004:
 | `registrationFile` | Token-2022 `uri` field (IPFS/HTTP) |
 | `transfer()` | Native Token-2022 transfer |
 | `setApprovalForAll()` | Token-2022 delegate |
-| `Feedback.request()` | SAS `FeedbackAuth` attestation |
-| `Feedback.submit()` | SAS `Feedback` attestation |
+| `giveFeedback()` | Blind feedback model (DualSignature) |
+| `feedbackAuth` (removed Jan 2026) | N/A — SATI uses stronger dual-signature |
 | Collection membership | TokenGroup extension |
 
 ---

docs/concepts/validation.md

@@ -7,6 +7,10 @@ description: Understanding ERC-8004 Validations and how they enable quality gate
 
 SATI's ValidationV1 schema implements the validation pattern defined in [ERC-8004 (Trustless Agents)](https://ethereum-magicians.org/t/erc-8004-trustless-agents/25098). This page explains what validations are for and how they work.
 
+::: info ERC-8004 January 2026 Update
+The January 2026 ERC-8004 spec update removed `feedbackAuth` for feedback (anyone can now submit feedback without agent involvement). However, validation still uses the request/response pattern with validator signatures — both parties must participate.
+:::
+
 ## Core Purpose
 
 From the ERC-8004 specification:

docs/getting-started.md

@@ -117,8 +117,8 @@ Compressed attestations are indexed via [Photon](https://photon.helius.dev/) (fr
 | Operation | Cost | Notes |
 |-----------|------|-------|
 | Agent registration | ~0.003 SOL | Mint + metadata + group + AgentIndex |
-| Feedback (single) | ~$0.002 | ~0.00001 SOL via Light Protocol |
-| Feedback (batched 5/tx) | ~$0.0006 | Amortized proof cost |
+| Feedback (single) | ~$0.002 | ~0.00002 SOL via Light Protocol |
+| Feedback (batched 5/tx) | ~$0.001 | Amortized proof cost |
 | Validation | ~$0.002 | Same as feedback |
 | ReputationScore | ~0.002 SOL | Regular SAS attestation |
 | Delegation grant | ~0.002 SOL | Regular SAS attestation (reclaimable) |

docs/guide/concepts.md

@@ -159,13 +159,13 @@ This enables multiple reputation providers to compete with different algorithms.
 ### Compressed (Light Protocol)
 
 - **Cost**: ~$0.002 per attestation
-- **Indexing**: Free via Photon
+- **Indexing**: Native via Photon RPC
 - **Use case**: High-volume feedback, validation
-- **Tradeoff**: Not directly RPC queryable
+- **Tradeoff**: Not directly queryable by other on-chain programs
 
 ### Regular (SAS)
 
-- **Cost**: ~0.002 SOL (~$0.40 at $200/SOL)
+- **Cost**: ~0.002 SOL rent (reclaimable)
 - **Indexing**: Standard RPC getProgramAccounts
 - **Use case**: ReputationScore, Delegation
-- **Benefit**: Direct on-chain queryability
+- **Benefit**: Direct on-chain queryability by other programs

docs/index.md

@@ -4,7 +4,7 @@ layout: home
 hero:
   name: SATI
   text: Solana Agent Trust Infrastructure
-  tagline: Production-ready agent reputation. ~$0.002 per attestation.
+  tagline: Agent trust infrastructure with cryptographic proof of participation.
   actions:
     - theme: brand
       text: Get Started
@@ -14,18 +14,18 @@ hero:
       link: https://github.com/cascade-protocol/sati
 
 features:
-  - icon: "\U0001F4B0"
-    title: 200x Cost Reduction
-    details: ZK Compression via Light Protocol stores attestations at ~$0.002 each. Batched feedback drops to ~$0.0006.
   - icon: "\U0001F510"
-    title: Blind Feedback Model
-    details: Agent signs with response (blind to outcome), client feedback is free. Cannot selectively participate.
+    title: Proof of Participation
+    details: Agent signs BEFORE knowing feedback sentiment — cannot selectively participate. ERC-8004 removed this guarantee in Jan 2026.
   - icon: "\U0001F517"
     title: x402 Native
     details: Canonical feedback extension for x402 payments. Payment tx becomes task reference (CAIP-220).
   - icon: "\u2705"
     title: ERC-8004 Compatible
     details: Full compatibility with the Ethereum agent registry standard. Cross-chain identity linking supported.
+  - icon: "\U0001F4B0"
+    title: Cost-Efficient Storage
+    details: ZK Compression via Light Protocol. ~$0.002 per attestation with native Photon indexing.
   - icon: "\U0001F3D7"
     title: Production Ready
     details: "Deployed to mainnet: satiRkxEiwZ51cv8PRu8UMzuaqeaNU9jABo6oAFMsLe"
@@ -41,7 +41,7 @@ features:
 | **Token-2022** | Agent identity as NFT with metadata |
 | **SAS** | Schema definitions + regular attestation storage |
 | **Light Protocol** | ZK Compressed attestation storage |
-| **Photon** | Free indexing for compressed accounts |
+| **Photon** | Native indexing for compressed accounts |
 
 ## Quick Example
 

docs/specification.md

@@ -16,9 +16,9 @@ outline: [2, 3]
 
 SATI is open trust infrastructure for AI agents on Solana solving the economics of on-chain feedback:
 
-- **Agent-subsidized feedback** — Agent signs with response (blind to outcome), client feedback is free
+- **Proof of participation** — Agent signs with response (blind to outcome); cannot selectively participate in only positive reviews
 - **x402 native** — Canonical feedback extension; payment tx becomes task reference (CAIP-220)
-- **200x cost reduction** — ZK Compression stores attestations at ~$0.002 each
+- **Cost-efficient storage** — ZK Compression via Light Protocol with native Photon indexing
 - **Schema agnostic** — Program verifies signatures on 131-byte universal base layout; new schemas without upgrades
 - **No reputation monopoly** — Multiple providers compete with different scoring algorithms
 - **Hot/cold wallet separation** — Delegates can sign attestations without full ownership permissions
@@ -71,13 +71,13 @@ SATI is the canonical feedback extension for x402. Payment tx hash becomes `task
 | Operation | Cost | Notes |
 |-----------|------|-------|
 | Agent registration | ~0.003 SOL | Mint + metadata + group + AgentIndex |
-| Feedback (single) | ~$0.002 | ~0.00001 SOL via Light |
-| Feedback (batched 5/tx) | ~$0.0006 | Amortized proof cost |
+| Feedback (single) | ~$0.002 | ~0.00002 SOL via Light Protocol |
+| Feedback (batched 5/tx) | ~$0.001 | Amortized proof cost |
 | Validation | ~$0.002 | Same as feedback |
 | ReputationScore | ~0.002 SOL | Regular SAS attestation |
 | Delegation grant | ~0.002 SOL | Regular SAS attestation (reclaimable) |
 | Delegation revoke | ~0.000005 SOL | Tx fee only; ~0.002 SOL rent returned |
-| Photon indexing | Free | Compressed attestations only |
+| Photon indexing | Free | Native indexing for compressed attestations |
 
 ---
 
@@ -1153,7 +1153,7 @@ SATI implements the [ERC-8004: Trustless Agents](https://eips.ethereum.org/EIPS/
 | `tokenURI` / registration file | ✅ | TokenMetadata.uri |
 | On-chain metadata | ✅ | TokenMetadata.additionalMetadata |
 | **Reputation** | | |
-| `feedbackAuth` | ⚡ | Replaced by dual-signature model (more secure) |
+| `feedbackAuth` | ⚡ | Removed in Jan 2026 ERC-8004 spec; SATI uses dual-signature model (more secure) |
 | `giveFeedback()` | ✅ | Compressed attestation via Light Protocol |
 | `revokeFeedback()` | ✅ | close_compressed_attestation() |
 | `appendResponse()` | ✅ | FeedbackResponse schema (deferred) |
@@ -1167,18 +1167,34 @@ SATI implements the [ERC-8004: Trustless Agents](https://eips.ethereum.org/EIPS/
 | DID support | ✅ | additionalMetadata["did"] |
 | CAIP-2/CAIP-10 | ✅ | Chain-agnostic identifiers |
 
-### Authorization Model Comparison
+### ERC-8004 January 2026 Spec Update
+
+The January 2026 ERC-8004 specification update **removed `feedbackAuth` entirely**:
 
-ERC-8004 uses `feedbackAuth` (agent pre-authorizes client). SATI uses **dual-signature blind feedback**:
+> "The new spec removes `feedbackAuth` entirely... leans harder on filtering by reviewer/clientAddress and off-chain aggregation for Sybil/spam mitigation"
 
-| Aspect | ERC-8004 feedbackAuth | SATI Dual-Signature |
-|--------|----------------------|---------------------|
-| Authorization | Agent signs permission upfront | Agent signs with response (blind) |
-| Selective blocking | Agent can refuse to authorize bad clients | Agent cannot refuse — signs before knowing outcome |
-| Sybil resistance | None (authorized client can submit anything) | Both parties must sign same task_ref |
+This means ERC-8004 now uses an **open feedback model** where anyone can submit feedback about any agent without the agent's involvement.
+
+### Authorization Model Comparison
+
+| Aspect | ERC-8004 (Jan 2026) | SATI Dual-Signature |
+|--------|---------------------|---------------------|
+| Agent authorization | None required | Agent signs with response (blind) |
+| Proof of interaction | None | Cryptographic (task_ref = payment tx) |
+| Sybil resistance | Off-chain filtering | Both parties must sign same task_ref |
+| Selective participation | N/A (open model) | Blocked — agent signs before knowing outcome |
 | Gas cost | Client pays | Agent pays (bundled into service) |
 
-> **Note**: ERC-8004 PR #11 removes `feedbackAuth` entirely, moving to open feedback. SATI's dual-signature model provides stronger guarantees than either approach.
+**Security implications:**
+
+| Attack Vector | ERC-8004 (new) | SATI |
+|---------------|----------------|------|
+| Sybil boosting (fake positive reviews) | Possible | Blocked — requires agent signature |
+| Competitor attacks (fake negatives) | Possible | Blocked — requires agent signature |
+| Selective participation | N/A | Blocked — agent signs before knowing outcome |
+| Proof of interaction | None | Cryptographic (task_ref = payment tx) |
+
+SATI's blind feedback model provides stronger guarantees than ERC-8004's open model. The tradeoff is complexity: SATI requires agent participation in the signature flow.
 
 ### CAIP and DID Support