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Changelog

Unreleased

Performance and Scalability

  • Concurrent Ethereum block processing path (#1383): runs event processing and internal data fetch in parallel; timeout/cancel control moved to caller for earlier aborts, reducing latency and wasted RPC work on failures.
  • Single-pass BTC block JSON parsing (#1385): removes duplicate block unmarshalling by parsing header and transactions in one pass, lowering ingestion overhead.
  • Batched ERC20 balance RPC calls (#1388): replaces per-contract eth_call with JSON-RPC batching for fungible token balances, adds configurable batch size and safe fallback for unsupported backends.
  • Dual HTTP/WS RPC client model for EVM chains (#1400): splits transport usage to HTTP for calls and WS for subscriptions.
  • Faster BTC mempool resync with batching + outpoint cache (#1403): adds optional batch tx fetch with bounded concurrency and a temporary resync outpoint cache to avoid repeated parent lookups.
  • Ethereum address-contract indexing micro-optimizations (#1417): adds hot-address LRU/index map to remove O(n) contract scans, bounds cache growth, and improves ERC20 aggregation hot-path overhead.
  • WebSocket/API perf + fiat observability improvements (#1423): batches fiat enrichment with robust fallback reasons, improves client-facing error behavior, and reduces log noise.

Reliability and Correctness

  • UTXO reorg detection fix in raw-parse path (#1398): populates BlockHeader.Prev for raw-parsed blocks to prevent missed fork detection that can stall sync on wrong tips.
  • Base newHeads burst handling fix (#1407): coalesces head notifications as hints and enforces strictly increasing block-number processing with a catch-up loop.
  • Reliable SIGTERM shutdown + clean RocksDB close (#1408): reworks signal fan-out so main shutdown always runs, unblocks workers, and stops periodic state writes during shutdown.
  • Resync recovery on errors (#1409): detects errors in parallel/bulk sync and triggers controlled resync restarts on rollback/reorg to avoid infinite retry stalls.
  • Fixed scientific notation parsing error (#1429): AmountToBigInt now safely handles scientific notation (e/E), keeps a fast path for plain decimals, and rejects pathological exponent expansion.

Configuration and Deployment

  • Configurable backend RPC endpoints for builds/tests (#1392): adds per-coin BB_RPC_URL_* overrides for non-local backends, BB_RPC_BIND_HOST_*/BB_RPC_ALLOW_IP_* for safer network exposure, plus rpc_url_ws_template and BB_RPC_URL_WS_* overrides.

Observability

  • Syncing/caching Prometheus metrics (#1420): introduces many new metrics for syncing throughput and cache behavior.
  • WebSocket/API perf + fiat observability improvements (#1423): adds Prometheus metrics for fiat enrichment and API behavior.

Fiat Pipeline

  • Fiat worker refactor + broader tests (#1424): extracts fiat logic from a large worker module, improves historical-fetch handling and deadline retry paths, and expands HTTP/WS fiat test coverage.

Testing

  • API-level E2E suite + deploy workflow (#1426): adds E2E tests against live Blockbook endpoints plus GitHub Actions build/deploy stages that wait for sync and run filtered E2E validation after deploy.

Security

  • Potential DoS fix for oversized pagination inputs (#1363): validates extreme page and pageSize values to prevent resource-exhaustion requests.
  • Security hardening: CSP + XSS fixes in templates (#1397): adds CSP headers and fixes XSS vulnerabilities in templates.
  • WebSocket origin allowlist (#1421): adds optional origin checks with explicit logging to reduce cross-origin websocket exposure when not protected by a proxy.
  • Request-size and template hardening (#1434): limits /api/sendtx body size, rejects oversized websocket messages, and avoids template.JSStr.

New Features and Chain Support

  • ENS resolver support (#1289).
  • Zcash upgrade (#1402).
  • Tron network support (#1273): adds Tron support to Blockbook.
  • Opt-in ERC-4626 vault enrichment for EVM tokens (#1431): adds REST/WS protocols=erc4626 batched vault detection and response enrichment under protocols.erc4626.
  • Contract metadata API with protocol enrichments: adds REST/WS single-contract lookup so clients can fetch current contract metadata and optional protocol payloads without reloading full accountInfo.

Backend Compatibility

  • Adjusted ZebraRPC for new zebrad backend version (#1377).