Add drivechain peg activity explorer

.github/workflows/ci.yml

@@ -0,0 +1,42 @@
+name: Build
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  locked-production-build:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: |
+            npm-shrinkwrap.json
+            client/npm-shrinkwrap.json
+            prerender-server/npm-shrinkwrap.json
+      - name: Install locked dependencies
+        run: npm ci
+      - name: Build Elements explorer
+        env:
+          API_URL: /api
+          IS_ELEMENTS: "1"
+          NATIVE_ASSET_ID: 11b705a6eaa8ebcb8cbdb9ae162d415afd3ed787385e541dc3224b88c2089057
+          NATIVE_ASSET_LABEL: L-BTC
+          BLIND_PREFIX: "4"
+          SITE_TITLE: LayerTwoLabs Liquid Signet Explorer
+          HOME_TITLE: LayerTwoLabs Liquid Signet
+        run: npm run dist
+      - name: Verify drivechain bundle
+        run: |
+          test -s dist/index.html
+          test -s dist/app.js
+          test -s dist/style.css
+          grep -q 'drivechain/pegs' dist/app.js
+          grep -q 'Peg activity' dist/app.js
+          grep -q 'peg-event-row' dist/style.css

API.md

@@ -382,6 +382,26 @@ Assets are returned in the same format as in `GET /asset/:asset_id`.
 
 The total number of results will be returned as the `x-total-results` header.
 
+### `GET /drivechain/pegs`
+
+Get the versioned BIP300 deposit, withdrawal, bundle commitment, and optional L1
+acknowledgement timeline for the active Elements sidechain.
+
+Query string parameters:
+
+- `start_height`: first sidechain height to scan. defaults to 0.
+- `count`: number of sidechain blocks to scan. defaults to 10000, maximum 10000.
+- `include_l1`: include normalized L1 CUSF lifecycle events. accepts `true`,
+  `false`, `1`, or `0` and defaults to `false`.
+
+The response includes `schema_version`, `sidechain_id`, `sidechain_tip`, the
+scanned `range`, and an `events` array. Event objects have stable `event_id`,
+`source`, `kind`, and `status` fields plus identifiers, values, and chain
+locations relevant to that lifecycle step.
+
+When `include_l1=true`, an unavailable L1 lifecycle provider returns HTTP 502.
+Clients can retry with `include_l1=false` to retain the sidechain-only timeline.
+
 ## Transaction format
 
 - `txid`

babel.config.json

@@ -1,4 +1,4 @@
 {
-  "presets": [ "@babel/env" ]
+  "presets": [[ "@babel/env", { "targets": { "ie": "11" } } ]]
 , "babelrcRoots": [ ".", "client" ]
 }

client/.babelrc

@@ -1,5 +1,5 @@
 {
-  presets: [ "@babel/env" ]
+  presets: [[ "@babel/env", { targets: { ie: "11" } } ]]
 , plugins: [
     ["@babel/plugin-transform-react-jsx", {"pragma": "require('snabbdom-pragma').createElement"}]
   ]