Summary: Enterprise teams are racing to secure EVM and L2 stacks amid record-scale crypto thefts, real-time sanctions actions, and tooling changes (e.g., Defender’s sunset). 7Block Labs implements continuous, standards-mapped on-chain monitoring that plugs into your SIEM, cuts MTTD to “sub-block” windows, and produces SOC 2-ready evidence without drowning ops in alert noise.

Target audience: Enterprise (keywords: SOC 2, ISO 27001, SIEM, SOAR, SLA, NIST CSF, procurement, audit evidence, ROI)

7Block Labs’ Continuous Security Monitoring for Blockchain

A specific technical headache most enterprise leaders are feeling right now: after Ethereum’s Dencun/EIP‑4844 shifted data posting to blobs and L2 activity doubled, the threat surface expanded while attacker tradecraft got more surgical. In 2025 alone, over $3.4B was stolen, with DPRK-linked actors accounting for ~$2.02B and focusing on fewer but higher-impact service compromises. Meanwhile, your compliance team now expects “continuous evidence” mapped to SOC 2 and NIST CSF, and your engineers just learned that OpenZeppelin Defender is being phased out by July 1, 2026—creating a monitoring gap if you don’t migrate. (galaxy.com)

Pain: what’s breaking in production (and in audits)

• Threat velocity and blast radius
  • “Few but huge” incidents dominate loss curves (e.g., Bybit’s $1.5B breach), while personal wallet compromises continue in the background. Boards ask for materially lower MTTD/MTTR and proof of response readiness aligned to NIST CSF 2.0. (theguardian.com)
• L2 and bridge dependencies
  • Dencun/EIP‑4844 reduced L2 fees via blob transactions, but also added new telemetry you must monitor (blob fee markets, fallback to calldata under blob fee spikes, sequencer stalls). OP Stack chains have seen stalls and elevated fees tied to L1 blob conditions—your runbooks need to account for this. (cointelegraph.com)
• Compliance and sanctions reality
  • Stablecoins (USDT/USDC) can be administratively frozen; issuers routinely blacklist addresses. Your UI/API may need to block at-risk flows based on real-time wallet screening to avoid sanctions exposure, and evidence that you did so needs to be audit-ready. (theblock.co)
• Tooling change management
  • OpenZeppelin is sunsetting the hosted Defender platform; Monitor/Relayer are now open source. If you treat monitoring as “set and forget,” you’ll face blind spots when SaaS endpoints change or rate-limits hit during an incident. (blog.openzeppelin.com)
• Account abstraction and L2 finality gotchas
  • ERC‑4337 stacks introduce paymaster/bundler failure modes (e.g., postOp-cost drains). ZK rollups finalize via proof pipelines on L1 with specific time windows that must be monitored for settlement health and UX impact. (osec.io)

Agitation: the real risks for your roadmap

• Missed deadlines due to unmanaged monitoring debt
  • Migration off legacy SaaS (Defender) + adding blob-aware monitors + L2 status tracking can easily consume sprints. Slip here, and your launch windows move—with procurement already forecasting SIEM overruns.
• Audit findings (SOC 2 Type II) for control drift
  • Without continuous, timestamped evidence mapped to AICPA 2017 TSC and NIST SP 800‑61r3 incident response guidance, your auditors will flag monitoring controls as “design-only,” not “operating effectively,” complicating revenue recognition and customer commitments. (aicpa-cima.com)
• Production incidents that “look fine” in cloud logs but burn on-chain
  • Sequencer stalls, proxy admin flips, and USDT/USDC blacklist events don’t surface in cloud APM. You need on-chain signals correlated to SIEM in near real time—or you’ll discover issues after funds or approvals move.
• Brand damage when sanctions or exploit addresses touch your UI
  • Many DeFi front-ends now gate interactions using TRM Labs’ Wallet Screening APIs with sub‑300ms risk scoring and cross‑chain exposure. If your UI doesn’t gate similarly, you’re out of step with the market and regulators. (trmlabs.com)

Solution: 7Block Labs’ methodology for continuous blockchain security monitoring

We bridge Solidity/ZK implementation detail with enterprise controls and business outcomes. Our approach is technical, measurable, and auditor-friendly.

1. Asset and dependency inventory (2 weeks)

• Enumerate contract addresses, proxies (EIP‑1967/UUPS), roles, guardians, oracles, paymasters, bundlers, bridge endpoints, sequencer and data-availability dependencies (per L2).
• Extract upgrade topology from EIP‑1967 slots and proxy contracts; record AdminChanged/Upgraded event histories as baselines. (eips.ethereum.org)
• Document L2 settlement characteristics (optimistic vs. ZK finality windows) and chain-specific incident feeds/status pages in runbooks. (coindesk.com)

1. Low-latency telemetry collection (days 1–21)

• Node-level subscriptions
  • Stand up redundant JSON‑RPC/WebSocket listeners (eth_subscribe: newHeads, logs) with roll‑forward and reorg handling; enable Erigon/Geth trace APIs for bytecode-level classifications. (geth.ethereum.org)
• Threat intelligence and detections
  • Forta detection bots for reentrancy, governance tampering, anomalous token movements, and sanctioned address interactions; private bots for proxy admin changes, role grants, and timelock misuse. (docs.forta.network)
• Sanctions and fraud screening
  • TRM Labs Wallet Screening API for UI gating and back-office triage (risk volume percent, VASP attribution, cross-chain exposure across 36 chains, typically sub‑300ms response). (trmlabs.com)
• L2 health feeds
  • Monitor OP Stack safe/unsafe head progression and blob fee fallback events that can spike user fees or delay finality, then auto‑message support/partner teams. (isdown.app)

1. Detection engineering (week 3–4): “detections as code” with business SLOs

We deliver high-signal, low-noise detectors mapped to specific controls and loss scenarios. Examples:

• Upgrade and control-plane tampering
  • Trigger on EIP‑1967 AdminChanged/Upgraded events; correlate with authorized change windows and multisig policies. “Out-of-window” upgrade = P1 page with auto‑freeze if configured. (eips.ethereum.org)
• ERC‑4337 paymaster safeguards
  • Detect postOp reverts that still pay the bundler from the paymaster deposit (potential draining pattern); enforce pre‑execution charging policies and rate-limit allowances. (osec.io)
• Stablecoin blacklist exposure
  • Alert when your treasury or customer wallets interact with newly blacklisted USDT/USDC addresses; block UI workflows and capture evidence for compliance. (theblock.co)
• L2 settlement and DA drift
  • Thresholds for “proof lag” on ZK rollups (e.g., > expected finality window), blob fee spikes causing rollups to fallback to calldata, or unsafe head stalls; route to incident runbooks. (docs.zksync.io)

1. Automated response and safe-guardrails

• OpenZeppelin Monitor/Relayer (self-hosted) to implement “if P1 then act” workflows:
  • Pause or restrict roles, rotate guardians, or route via Safe module for emergency controls.
  • Send Flashbots/private tx for sensitive changes to limit MEV exposure.
  • Signed webhooks push into SOAR for playbooks (HMAC validation, replay protection). (docs.openzeppelin.com)
• UI-level risk controls
  • Gateflows on TRM risk scores and on-chain sanctions alerts; maintain allow/deny lists with time-bound overrides and audit trails. (trmlabs.com)

1. Evidence, reporting, and SOC 2/NIST mapping (continuous)

• Evidence pipeline
  • Every alert, suppression, and action emits a normalized record to your SIEM using Splunk HEC or Datadog Logs intake APIs (tokenized, gzip, sub‑MB payloads; with indexer acknowledgment where applicable). (docs.splunk.com)
• Control frameworks
  • Map detections and incident workflows to AICPA 2017 Trust Services Criteria and NIST SP 800‑61r3, with CA‑7 (continuous monitoring) coverage for ISO 27001 Annex A linkages. We maintain crosswalks and “control → evidence” pointers your auditors can sample. (aicpa-cima.com)

1. Operate and improve: SLAs, game-days, and cost control

• SLOs and SLAs
  • Target “sub‑block” MTTD for critical events on L1 (≤12s median) and “<2 blocks” on major L2s; 95th percentile notification <60s from inclusion.
• Game-days
  • Quarterly war‑games for proxy upgrade incidents, sanctions hits, and sequencer stalls; capture lessons learned and update runbooks per NIST 800‑61r3. (csrc.nist.gov)
• Cost discipline
  • We enrich and throttle to SIEM only when rules hit severity thresholds, cutting ingestion volume while preserving complete cold-storage logs for reconstruction.

How it connects to your stack in practice

• Data plane
  • Dual-provider RPC with WebSocket pub/sub; Erigon tracing for post-incident reconstruction; Forta public/private bots for live detections; TRM screening at the edge. (geth.ethereum.org)
• Control plane
  • Self-hosted OpenZeppelin Monitor/Relayer, integrated with Safe, Flashbots, and your SOAR. Defender migration is planned to prevent July 1, 2026 cutover issues. (docs.openzeppelin.com)
• Evidence and governance
  • Splunk HEC/Datadog APIs with signed webhooks; report packs aligned to SOC 2 TSC categories (Security/Availability) and CSF 2.0 functions (Identify/Protect/Detect/Respond/Recover). (docs.splunk.com)

Practical examples (with precise, current details)

• Example A: EIP‑1967 proxy upgrade guardrails
  • Detector: subscribe to logs for AdminChanged/Upgraded topics across your proxy fleet; compare to approved CAB change windows. If mismatch, auto‑initiate a Safe transaction that toggles pause() and alerts on-call; ship evidence to Splunk with CAB ticket ID in context. (eips.ethereum.org)
• Example B: ERC‑4337 paymaster hardening
  • Policy: pre‑fund user ops during validation; block “postOp-only charge” patterns to prevent bundler drain. Detector simulates allowlist/allowance and flags differences between simulation and inclusion-time state (common exploit vector). (osec.io)
• Example C: L2 blob fee surge and fallback
  • Monitor OP Mainnet for “elevated fees due to blob spikes” and rollup fallback to calldata; notify CX and throttle high-cost operations; record impact window for postmortem. (isdown.app)
• Example D: Sanctions-aware UX
  • Front-end gates wallet connects via TRM: sub‑300ms risk response includes risk volume percent and VASP attribution; block or warn accordingly and keep immutable audit trails for SOC 2 evidence. (trmlabs.com)
• Example E: ZK rollup settlement monitors
  • Track proof generation and submission; alert if ZKSync finality exceeds the ~hours-range baseline, or Polygon zkEVM proof aggregation falls behind expectations, prompting liquidity-ops to adjust bridging messaging. (docs.zksync.io)

What results should an enterprise expect? (GTM metrics you can take to procurement)

• Time-to-value
  • 2–3 weeks to stand up core data plane and baseline detectors across L1 plus one L2; 30 days to complete SOC 2 evidence mapping and SIEM dashboards.
• MTTD/MTTR improvements
  • “Sub‑block” MTTD for high‑severity events; MTTR depends on your governance (multisig latency), but automated responses cut manual toil and paging loops.
• Noise reduction
  • 60–80% fewer SIEM events vs naive “pipe all logs” by enriching and filtering on-chain signals pre‑ingest—reducing ingestion spend while preserving forensics depth.
• Compliance readiness
  • Continuous evidence streams mapped to AICPA 2017 TSC and NIST 800‑61r3; auditors can sample incidents, alerts, and actions with immutable timestamps. (aicpa-cima.com)
• Risk reduction (macro context)
  • You’re operating in a year when total stolen funds have set new highs and nation-state actors concentrate on large targets; continuous monitoring that ties to response controls is no longer optional. (chainalysis.com)

Why 7Block Labs

• We build, monitor, and secure—end-to-end—from Solidity and zk rollup specifics to your SIEM dashboards and SOC 2 narratives. If you also need implementation support, our teams deliver battle-tested custom blockchain development services and smart contract development solutions with an audit-first discipline via our security audit services.
• Cross‑chain and L2 aware: we plan for OP Stack stalls, blob fee market volatility, and ZK proof pipelines, and integrate those signals into your response playbooks—alongside clean evidence for auditors. If you’re expanding, we also offer cross-chain solutions development, blockchain integration, and full-stack web3 development services.

Emerging best practices we implement now

• Treat “detections as code” with versioning, tests, and staged promotion; unit test detectors against historical exploits.
• Separate “safety actions” (pause, role revoke) from “business actions” (price parameter tweaks), and require distinct approvals, so emergency responses don’t drift into policy changes.
• For ERC‑4337, prefer pre‑execution charging; maintain bundler/paymaster diversity and watch the EntryPoint version in use (v0.7 widely deployed; track v0.8+ changes). (alchemy.com)
• Keep a sanctions “kill switch” at the edge (UI/API) with evidence logging to your SIEM; do not rely solely on issuer blacklist timing. (circle.com)
• Test L2 incident drills: sequencer stall, bridge delay, and blob-fee spikes. Make sure CX and finance teams know the communications and fee‑impact steps. (isdown.app)

Scope options and procurement notes

• 90‑day pilot (recommended)
  • Scope: One EVM L1 and one L2, baseline detectors, sanctions gating, SIEM integration, and SOC 2/NIST mapping.
  • Deliverables: SLOs, alert taxonomy, runbooks, weekly metrics, and a final “Type II readiness” evidence pack.
• Expand to multi‑chain
  • Add bridge monitoring and additional L2s; integrate Forta private bots and chain-specific status pipelines.

Footnotes and sources that matter to executives and auditors

• Chainalysis 2025 thefts/DPRK attribution; mid‑year and 2026 report previews. (chainalysis.com)
• NIST SP 800‑61r3 (final, April 2025) and CSF 2.0 alignment. (csrc.nist.gov)
• Ethereum Dencun/EIP‑4844 impact on L2 activity and fees; operational caveats under blob-fee spikes. (galaxy.com)
• OpenZeppelin Defender sunset, Monitor/Relayer open-sourced; migration implications. (blog.openzeppelin.com)
• TRM Labs Wallet Screening API improvements (risk volume percent, VASP attribution, 36‑chain cross‑chain exposure). (trmlabs.com)
• Forta detection kits for DeFi/stablecoins/governance; integration patterns. (docs.forta.network)

If you need the same rigor applied to core product work (bridges, DeFi, asset rails), we can couple monitoring with delivery through our DeFi development services and cross-chain solutions, keeping security instrumentation in lock-step with feature rollouts.

Call to action (Enterprise): Book a 90-Day Pilot Strategy Call