IABTechLab · ChristianPavilonis · Mar 25, 2026
diff --git a/.claude/agents/issue-creator.md b/.claude/agents/issue-creator.md
@@ -79,7 +79,7 @@ Output the issue URL and type.
 - Use issue **types**, not labels, for categorization.
 - Every issue should have clear done-when / acceptance criteria.
 - Use the affected area dropdown values from the templates:
-  - Core (synthetic IDs, cookies, GDPR)
+  - Core (Edge Cookies, GDPR)
   - Integrations (prebid, lockr, permutive, etc.)
   - HTML processing / JS injection
   - Ad serving (Equativ)

diff --git a/.claude/agents/repo-explorer.md b/.claude/agents/repo-explorer.md
@@ -11,7 +11,7 @@ implementation details.
 
 This is a Rust workspace with three crates:
 
-- `crates/trusted-server-core/` — core library (integrations, HTML processing, synthetic IDs, GDPR)
+- `crates/trusted-server-core/` — core library (integrations, HTML processing, Edge Cookies, GDPR)
 - `crates/trusted-server-adapter-fastly/` — Fastly Compute entry point
 - `crates/js/` — TypeScript/JS build pipeline (per-integration IIFE bundles)
 

diff --git a/.github/actions/setup-integration-test-env/action.yml b/.github/actions/setup-integration-test-env/action.yml
@@ -71,7 +71,7 @@ runs:
       env:
         TRUSTED_SERVER__PUBLISHER__ORIGIN_URL: http://127.0.0.1:${{ inputs.origin-port }}
         TRUSTED_SERVER__PUBLISHER__PROXY_SECRET: integration-test-proxy-secret
-        TRUSTED_SERVER__SYNTHETIC__SECRET_KEY: integration-test-secret-key
+        TRUSTED_SERVER__EDGE_COOKIE__SECRET_KEY: integration-test-secret-key
         TRUSTED_SERVER__PROXY__CERTIFICATE_CHECK: "false"
       run: cargo build --package trusted-server-adapter-fastly --release --target wasm32-wasip1
 

diff --git a/CLAUDE.md b/CLAUDE.md
@@ -6,7 +6,7 @@
 ## Project Overview
 
 Rust-based edge computing application targeting **Fastly Compute**. Handles
-privacy-preserving synthetic ID generation, ad serving with GDPR compliance,
+privacy-preserving Edge Cookie (EC) ID generation, ad serving with GDPR compliance,
 real-time bidding integration, and publisher-side JavaScript injection.
 
 ## Workspace Layout
@@ -366,7 +366,7 @@ both runtime behavior and build/tooling changes.
 | `crates/trusted-server-core/src/tsjs.rs`                  | Script tag generation with module IDs             |
 | `crates/trusted-server-core/src/html_processor.rs`        | Injects `<script>` at `<head>` start              |
 | `crates/trusted-server-core/src/publisher.rs`             | `/static/tsjs=` handler, concatenates modules     |
-| `crates/trusted-server-core/src/synthetic.rs`             | Synthetic ID generation                           |
+| `crates/trusted-server-core/src/edge_cookie.rs`           | Edge Cookie (EC) ID generation                    |
 | `crates/trusted-server-core/src/cookies.rs`               | Cookie handling                                   |
 | `crates/trusted-server-core/src/consent/mod.rs`           | GDPR and broader consent management               |
 | `crates/trusted-server-core/src/http_util.rs`             | HTTP abstractions and request utilities           |

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/OPTIMIZATION.md b/OPTIMIZATION.md
@@ -35,7 +35,7 @@ This document presents a performance analysis and optimization plan for the Trus
 | ~2% | `IntegrationRegistry` | Route lookup + attribute rewriting + initialization |
 | ~0.8% | Memory allocation (`RawVec::reserve`) | Buffer growth during processing |
 | ~0.5% | Logging (`fern` / `log_fastly`) | Minimal overhead |
-| ~0.5% | Synthetic ID generation | HMAC computation |
+| ~0.5% | EC ID generation | HMAC computation |
 | ~0.5% | Header extraction | `fastly::http::handle::get_header_values` |
 
 ### Key Takeaways
@@ -271,7 +271,6 @@ let settings: Settings = postcard::from_bytes(SETTINGS_DATA)
 | `eq_ignore_ascii_case` for compression detection | `streaming_processor.rs:47` | 5 |
 | `Cow<str>` for string replacements | `streaming_replacer.rs:120-125` | 5-10 |
 | Remove base64 roundtrip in token computation | `http_util.rs:286-294` | 10-15 |
-| Replace Handlebars with manual interpolation | `synthetic.rs:82-99` | ~20 |
 | Cache `origin_host()` result per-request | `settings.rs` | 5-10 |
 
 ---

diff --git a/PUBLISHER_IDS_AUDIT.md b/PUBLISHER_IDS_AUDIT.md
@@ -11,7 +11,7 @@ This document lists all publisher-specific IDs and configurations found in the c
 - `server_url = "https://securepubads.g.doubleclick.net/gampad/ads"` (line 15)
 
 **Equativ Configuration:**
-- `sync_url = "https://adapi-srv-eu.smartadserver.com/ac?pgid=2040327&fmtid=137675&synthetic_id={{synthetic_id}}"` (line 8)
+- `sync_url = "https://adapi-srv-eu.smartadserver.com/ac?pgid=2040327&fmtid=137675&ec_id={{ec_id}}"` (line 8)
   - Page ID: `2040327`
   - Format ID: `137675`
 
@@ -20,9 +20,8 @@ This document lists all publisher-specific IDs and configurations found in the c
 - `cookie_domain = ".test-publisher.com"` (line 3)
 - `origin_url = "https://origin.test-publisher.com"` (line 4)
 
-**KV Store Names (user-specific):**
-- `counter_store = "jevans_synth_id_counter"` (line 24)
-- `opid_store = "jevans_synth_id_opid"` (line 25)
+**KV Store Names:**
+*(Removed — `counter_store` and `opid_store` were removed in the EC rename; they were vestigial from the template-based SyntheticID generation.)*
 
 ## Hardcoded in Source Code
 

diff --git a/crates/integration-tests/Cargo.lock b/crates/integration-tests/Cargo.lock
diff --git a/crates/integration-tests/fixtures/configs/viceroy-template.toml b/crates/integration-tests/fixtures/configs/viceroy-template.toml
@@ -7,16 +7,6 @@
     [local_server.backends]
 
     [local_server.kv_stores]
-        # These inline placeholders satisfy Viceroy's local KV configuration
-        # requirements without exercising KV-backed application behavior.
-        [[local_server.kv_stores.counter_store]]
-            key = "placeholder"
-            data = "placeholder"
-
-        [[local_server.kv_stores.opid_store]]
-            key = "placeholder"
-            data = "placeholder"
-
         [[local_server.kv_stores.creative_store]]
             key = "placeholder"
             data = "placeholder"