Security-First Blockchain Development at 7Block Labs

At 7Block Labs, we’re all about putting security at the forefront of our blockchain projects. In today’s rapidly evolving digital landscape, ensuring the safety and integrity of your blockchain solutions is more important than ever. Here’s how we do it.

Our Approach to Security

We take a multi-layered approach when it comes to security. This means we don’t just slap on some protective measures but create a comprehensive security framework that tackles potential vulnerabilities from every angle.

1. Code Audits

Before any project sees the light of day, our team conducts thorough code audits. This helps us identify and fix issues early on in the development process. We adhere to best practices and industry standards to ensure the highest level of security.

2. Smart Contract Testing

Smart contracts are at the heart of many blockchain applications. Our rigorous testing process ensures these contracts perform as intended without any loopholes. We simulate various scenarios to make sure everything runs smoothly.

3. Security Best Practices

We follow a set of security best practices throughout the development lifecycle. This includes:

• Adopting a secure coding standard.
• Regularly updating our libraries and dependencies.
• Implementing strict access controls.

Collaboration with Security Experts

We believe that collaboration is key to enhancing security. Our team works closely with external security experts to get fresh insights and validate our security measures. This ongoing partnership helps us stay ahead of potential threats.

In-House Security Training

Security isn’t just a checkbox for us - it’s part of our culture. That’s why we provide in-house training for our developers to keep them updated on the latest security trends and techniques. Empowering our team means we can build safer products.

Stay Updated with Us

Want to keep up with our security initiatives and blockchain developments? Check out our blog for the latest updates and insights. We’re committed to sharing our knowledge and learning along the way.

Conclusion

At 7Block Labs, we’re dedicated to building secure blockchain solutions that you can trust. Our proactive approach, combined with a strong commitment to security, ensures we deliver top-notch products that stand the test of time. If you’re ready to embark on a secure blockchain journey, let’s connect!

Who this is for (ICP: Enterprise)

This is aimed at CIOs, CTOs, and Heads of Platform/Risk and Procurement. Here are some keywords that are probably on your radar: SOC 2 Type II, ISO 27001, SBOM, SLSA 1.1, SLAs, RFP/RFI, KMS/HSM, IAM, SOAR, and SIEM.

the specific technical headache derailing your roadmap

• Protocol churn breaks your plans. Ethereum’s Dencun (mainnet launching March 13, 2024) has shaken things up with new execution behaviors, like EIP‑4844 blobs and EIP‑1153 transient storage. While Layer 2 fees have plummeted for those blob-ready rollups, the blob congestion events have flipped cost models on their heads overnight. If you were budgeting based on “calldata-era” fees, you might want to rethink that as it’s now way off. (blog.ethereum.org)
• Wallets and AA are moving targets. The ERC‑4337 shared mempool just hit its stride in late 2024. Before that, inclusion guarantees were pretty flimsy, and the risk of censorship was higher. Teams are still relying on private queues, misconfigured paymasters, or sometimes just skipping redundancy altogether. (docs.erc4337.io)
• Tooling deprecations land mid-project. Mark your calendars: OpenZeppelin Defender is saying goodbye on July 1, 2026. That means you’ll need to migrate your monitors and relayers or you might end up with some serious blind spots and disrupted change workflows. (blog.openzeppelin.com)
• ZK libraries keep shifting. Updates to Solidity and gnark have brought in new features and patched some real vulnerabilities; however, hardware-accelerated provers (like ICICLE Groth16) are changing the game when it comes to build-vs-buy decisions. Using the wrong backend--or even the wrong version--could expose witness data or bust your proving budget. (soliditylang.org)
• Cross-chain remains the largest single blast radius. Bridges are still a hot spot for laundering and have been responsible for a staggering share of multi-hundred-million losses. Design missteps in this area can pose serious risks at the board level. (chainalysis.com)

the risk to your P&L and audit clock

• Missed milestones and budget variance: So, blobs were anywhere from about 50 to 600 times cheaper than calldata during low contention periods, but then the first blob congestion event hit, and fees skyrocketed. Teams that didn’t have blob-aware throttling totally blew their cost SLOs. Check it out here.
• Audit and compliance whiplash: When procurement comes knocking, they want SOC 2-aligned SDLC evidence, SBOMs, and provenance. If you don’t have SLSA-compliant attestations (think sigstore/in-toto), you’re going to find yourself stuck in the InfoSec review limbo. Here’s more on that.
• Exploit asymmetry: In 2025, we saw record-breaking service-level thefts thanks to a handful of “mega-hacks” that really skewed the numbers. Bridges are still the top choice for laundering, meaning your incident response window just got squeezed down to mere minutes. Read more here.
• AA/7702 pitfalls: With delegated auth (7702) and 4337 pipelines, there are new phishing and replay risk factors popping up. If your validation is mis-scoped or your paymaster policy isn’t tight, you could be opening the door to some serious systemic loss. Learn more about this risk.
• Compiler/stack risk: Watch out for bugs in your language or libraries (like Vyper’s reentrancy-guard bug that was used against Curve) and mis-audited logic (remember Euler’s donateToReserves path?). These issues can lead to major downstream failures. Dive into the details here.

7Block’s Security-First Approach Aligned with Enterprise Outcomes

We design with a focus on verifiable security, predictable costs, and smooth procurement approval. Our methodology is modular, meaning that every stage produces deliverables that your auditors and PMO can easily work with.

1) Governance-by-default SDLC (SOC 2/NIST-aligned)

• Policy: We’re all about threat modeling and control mapping that lines up with SOC 2 Trust Services Criteria and NIST 800‑53. We create the kind of control evidence that your assessors are looking for, like design reviews, change logs, and RBAC matrices. Check it out here.
• Supply Chain: We follow SLSA 1.1 for provenance and use SBOMs that are signed with sigstore cosign v3. Our attestations seamlessly connect with GitHub Artifact Attestations and in-toto, which has now graduated to CNCF. This approach really helps us minimize risks during vendor reviews and speeds up the RFP process. Learn more here.
• Key Management: Our signing method is backed by HSM, using secp256k1 through Azure Key Vault (Managed HSM) or AWS KMS (ECC_SECG_P256K1) with flexible rotation options. We’ve integrated approvals and separation of duties right into our deploy and upgrade flows to keep everything secure. For details, visit this page.

2) Solidity Engineering with Upgrade Safety and Gas Determinism

• Compiler Strategy: We’re sticking with Solidity 0.8.28 to take full advantage of transient storage support for value types and to boost IR compilation performance. By locking solc in our CI, we also keep tabs on any EVM feature usage (like EIP‑1153 and EIP‑5656). This way, we dodge those pesky “works on my machine” bytecode issues and cut down on cold build times. Check out the details on soliditylang.org.
• Upgradeability: We recommend using UUPS along with ERC‑1967 storage slots to steer clear of any collisions. We set up explicit upgrade gates via AccessControl and Timelock, ensuring there's no “god owner” situation. Plus, we back this with slither-check-upgradeability in our CI process. More info can be found on docs.openzeppelin.com.
• Analysis Stack: Our toolkit includes Slither (for static analysis), Mythril (symbolic execution), Echidna (property fuzzing), and Foundry proptest combined with gas snapshots. We establish coverage and gas budgets for each feature and make sure to fail PRs that cause any regressions. If you want to dive deeper, check out our setup on github.com.

3) Post-Dencun Cost Engineering (ROI You Can Forecast)

• L2 Data Costs: We're switching up how we handle calldata by using blob transactions whenever we can, and we're batching them to keep things under those pesky blob base fee cliffs. This means you could see costs drop by a jaw-dropping 10-600 times when things are chill. Of course, we’re also preparing for those worst-case scenarios (like that "blobscriptions" event on March 27, 2024), so we’ve got throttles and surge controls in place just in case. (investopedia.com)
• Operational Guardrails: We'll set up alerts to keep an eye on any wild swings in blob base fees. If prices go over our set thresholds, we’ll automatically switch to deferred settlement. Plus, we’ll share cost Service Level Objectives (SLOs) tied to your key performance indicators (like txn/unit and cost/DAU) and show the results after 30, 60, or 90 days.

4) Zero-knowledge with bounded risk, measured throughput

• Backend selection: We go for Groth16 when you need lightning-fast on-chain verification (using BN254 and 3 pairings), and PlonK is our choice for universal setups or when recursion is on the table. If you’re using gnark v0.10 or newer, you can get both and even export Solidity verifiers! We keep an eye on CVEs, like the commitment issue with gnark versions below 0.11. You can check it out here.
• Prover acceleration: Our ICICLE-snark is a game changer for speeding up Groth16 proving; we actually benchmark proofs per watt to help us forecast infrastructure needs. If we have to, we break down circuits into smaller pieces (micro-proofs) to meet SLAs. You can find more details here.
• Circom/Noir ecosystem: We’re all about making circuit reproducibility standard (thanks to circom 2.2.x), ensuring builds are deterministic, and pinning transcripts. Plus, we’ve got some solid toxic-waste custody procedures for trusted setups (or we just sidestep that with PlonK). Check it out here.

5) Wallets, AA, and EIP‑7702 Without Foot‑Guns

• Inclusion guarantees: By default, we’re using ERC‑4337 shared mempool bundlers to keep things running smoothly. Plus, our multi-RPC submission and resubmission policies help lower the risk of censorship and single-bundler issues. You can find more details about this here.
• Validation policies: We’re all about keeping validateUserOp both deterministic and cost-effective to meet that 7562 requirement. We're also shifting some heuristics off-chain with signed contexts, and we cap the sponsored gas and velocity for each user/paymaster. Just so you know, we’ve got internal playbooks for the changes in EntryPoint from version 0.6 to 0.8 and for 7702 interoperability. If you’re curious, check the details here.
• 7702 risk controls: To stay safe, we’re putting up gates for authorizations using allowlists, session scopes, and auto-expiry features. We even run simulations on delegated code paths to dodge those pesky “persistent execution control” phishing tactics that have popped up in recent research. You can read more about that here.

6) Runtime operations and incident response

• Monitoring: We take care of moving Defender monitors and relayers to supported stacks and set up Forta premium feeds and bots (like the attack detector, anomalous transfers, and sanctions) to catch any signals before or during an exploit. Alerts get sent straight to PagerDuty or Opsgenie, and we’ve got playbooks ready to help us pause operations, suggest fixes, and implement them using multisig. You can find more info here.
• Access and kill-switches: We use AccessControl/AccessManager along with TimelockController for those admin ops that need a bit of delay; we also implement Pausable on critical flows to keep the impact as minimal as possible. During tabletop exercises, we really emphasize our cancel paths and guardian roles to stay prepared. Check out more details here.

7) Cross‑Chain Exposure Minimization

• It's a good idea to stick with canonical L2 bridges or go for CCIP-style providers that use slashed or attested oracles. When it comes to asset flows, we’ve set up a time-bounded mint/burn strategy with circuit-breaker outflows. Plus, we keep an eye on bridges, since they’ve been key players in laundering (over 50% of hacked value in H1-2025 was funneled through bridges) to help us quickly tackle any incidents. (bitcoinke.io)

UUPS Upgrade Path That Passes Audit and Ops Muster

Problem

You’ve got some Transparent proxies hanging around with delicate admin keys and no delay windows.

Our Approach

• Migrate to ERC‑1967 UUPS. We’ll use explicit proxiableUUID checks and make sure upgradeToAndCall is gated by AccessControl and a TimelockController. Check out the details over at OpenZeppelin Docs.
• Implement EIP‑1153 transient reentrancy guards where it makes sense. This will help cut down on SSTORE churn. For more on this, take a look at the Ethereum Blog.
• Continuous Integration: We’ll run slither checks for upgradeability, compare storage layouts, keep an eye on Foundry’s .gas-snapshot budget, and run Echidna invariants for pause/unpause and role drift. You can find Slither right here: GitHub.

Business Outcome

With this setup, we can expect fewer on-call alerts for upgrade risks, solid evidence of changes for SOC 2 compliance, and we’ll see measurable gas savings on the hot paths.

ZK Compliance Proofs with Bounded Costs

The Challenge

You need to prove certain attributes--like eligibility and limits--without giving away any personally identifiable information (PII), make sure everything gets verified on-chain, and keep those transaction costs predictable.

Our Approach

• We’re using a circuit in gnark v0.10+; employing Groth16 on BN254 for 3-pairing verification on the Ethereum Virtual Machine (EVM); plus, we leverage GPU-assisted provers to meet our service level agreements (SLAs). Check it out on GitHub.
• We make sure to attest the circuit version and parameters in our Software Bill of Materials (SBOM). We also have cosign attestation linked to GitHub Artifact Attestations to ensure we have that CI/CD provenance covered. Want to know more? Dive into the details at Sigstore Blog.
• Lastly, we generate a Solidity verifier from the verification key (vk). We put a cap on the gas costs for on-chain verification and have a circuit-ID registry in place for those phased rollouts.

L2 Cost Model and Guardrails Post-Dencun

• The Issue: You initially projected that by April 2024, we'd see consistent savings of 100x, but when those October 2025 invoices rolled in, that just wasn’t the case.
• Our Game Plan:
  • We switch to blob posting when the blob base fee drops below a certain threshold. If it’s above, we hold off and batch things up smartly. We keep an eye on any spikes in blob base fees (like that big surge on March 27, 2024) and make sure we can adapt smoothly. Check out more about this here.
  • Our contract analytics connect blob prices, batch sizes, and inclusion latency to key product metrics. We project costs at the 90th percentile while also setting hard caps and throttles that users can actually see.
• The Result: We’re looking at more predictable costs of goods sold (COGS), fewer surprises when it comes to escalations, and variance bands that finance can get on board with.

GTM Metrics We Target and Report

• Build throughput: We're seeing a boost of 10-25% faster IR pipeline compiles and a notable 50-80% decrease in solc memory usage on bigger projects by sticking with version 0.8.28 (all measured in CI). Check it out here.
• Cost efficiency: When blobs aren't congested, we're talking about a staggering 10-600x reduction in L2 data costs, with surge protection in place to dodge those worst-case spikes. More details can be found here.
• Secure SDLC readiness: We're implementing SLSA 1.1 provenance and sigstore/in‑toto attestations for every release, plus we’ve got SOC 2 auditor-consumable control evidence that aligns with NIST 800‑53. You can read more about it here.
• On‑chain risk telemetry: With Forta feeds and custom bots keeping an eye on funding, prep, and exploit phases, we’re working hard to reduce mean time to detect (MTTD). Oh, and we’ve migrated governance and ops monitors off Defender before the 2026 sunset--check the details here.
• Wallet/AA reliability: We're using shared mempool bundlers, multi-endpoint routing, and off-chain policy enforcement to cut down on failed inclusions and help prevent paymaster abuse. You can find more info here.

What We Deliver (Artifact-Driven, Audit-Friendly)

• We provide a solid architecture and threat model that aligns perfectly with SOC 2 and NIST 800‑53 controls. Check it out here: (aicpa-cima.com).
• You’ll get an SBOM along with SLSA 1.1 provenance and cosign/in-toto attestations. More details can be found at (slsa.dev).
• Our security test harness includes tools like Slither, Mythril, Echidna, and Foundry config, with gas budgets and fuzz/invariant suites to ensure thorough testing. Dive into it here: (github.com).
• We focus on formal properties where they really make an impact, using Certora Prover for those critical rules. Plus, we integrate proofs into CI and keep track of counterexamples. Learn more at (docs.certora.com).
• Our runtime operations pack features Forta playbooks, a detailed Defender migration plan, and AccessControl/Timelock and Pausable wiring, all set up with emergency runbooks for your peace of mind. Check it out: (docs.openzeppelin.com).

How We Engage (and Where to Learn More)

• Design and Build: Check out our custom blockchain development services and smart contract solutions, crafted for enterprise-grade delivery, all backed by strict security measures.
  • Links: custom blockchain development services, smart contract development, web3 development services, dApp development
• Assurance and Audits: We offer independent security reviews, formal property assessments, and red-team simulations to keep your projects safe.
  • Links: security audit services, DeFi development services
• Systems Integration and Scale: Our support includes KMS/HSM custody, seamless ERP/CRM integration, cross-chain connectivity, and efficient rollup data pipelines.
  • Links: blockchain integration, cross-chain solutions development, blockchain bridge development

Notes on Current Best Practices We’ll Apply on Day One

• Let’s go with EIP‑1153 transient storage for our reentrancy locks and any temporary state when it makes sense. Just remember to document how we're using assembly and test the gas implications for each path. You can find more details here.
• For upgrades, let's stick with UUPS and ERC‑1967, using Timelock and role‑scoped upgrades. We'll also need to make sure we don't allow emergency upgrades without a quorum, unless things are "paused" and under some strict time limits. Check out the specifics here.
• When it comes to AA, it's best to use bundlers that are part of the shared mempool. We should also test how inclusion works across different bundlers. Let's keep the validateUserOp function strict and deterministic while making the paymaster logic lightweight. More info can be found here.
• For our ZK backend, we should default to Groth16 when the verification gas is a big deal and the circuits are stable. If we expect a lot of changes or recursion, then PlonK is the way to go. Let's keep an eye on the gnark release notes and any CVEs. You can track that here.
• Finally, let’s keep a close watch on bridges, treating them as both targets and potential laundering routes. We should rate-limit outflows and implement anomaly models during the funding, preparation, and exploitation phases. There's more guidance here.

The Cost of Waiting

Every month you put off blob-aware batching, AA policy hardening, or migrating to Defender, you're piling up operational and audit debt. The numbers reveal that attackers can shift billions through bridges in no time; without ready-made playbooks and monitoring systems, you're risking your brand relying on manual Slack threads. (chainalysis.com)

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