Add full Chain 138 integration: 8 steps, chain spec, app-ethereum config, docs

Co-authored-by: Cursor <cursoragent@cursor.com>
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2026-02-12 15:57:08 -08:00
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# Step 5 — API
Provide **RPC and explorer** details to Ledger. Use **rpc-explorer-config.ts**:
- **RPC_ENDPOINTS** — Public HTTPS and WSS URLs for Chain 138.
- **EXPLORER** — Blockscout at https://explorer.d-bis.org (EIP3091); optional apiUrl for indexer.
- **BLOCK_AVG_TIME_SEC** — ~2s for Chain 138 (Besu QBFT).
Ledger may run their own indexer or proxy; they will specify. Have these values ready for their config or env (e.g. `API_DEFI_ORACLE_META_NODE`).