Summary: This is your go-to guide for decision-makers looking to dive into blockchain penetration testing. Let's dive into how we can spot potential threats in things like smart contracts, rollups, bridges, and account abstraction. We'll also showcase the tools you'll need in 2025 to spot those important issues. No need to stress-- we'll go over what deliverables to look for from your vendor. This way, you can make sure that fixes get rolled out quickly and that any risks are kept to a minimum.

Blockchain Penetration Testing 101: Threat Models, Tools, and Deliverables

So, if you're diving into blockchain solutions or already getting them out there, you might be wondering--it's not just about asking, "Do we need a pen test?" The real question is, "What does an awesome pen test for 2025 actually look like to steer clear of the next major disaster?"

Here’s a handy playbook that we use over at 7Block Labs. It’s all about how to scope out, test, and put in place fixes for things like on-chain code, rollups, bridges, and those cool account-abstraction stacks. We’ve got your back!

This isn’t your run-of-the-mill security tip. What you're looking at is a glimpse into what's happening right now. You'll find detailed threat models, useful tools that really work, and the kind of deliverables you should definitely be keeping an eye on.

1) Scope by threat model, not by repository

Modern blockchain apps are designed to work across different trust boundaries. If you only focus on "the Solidity repo," you're missing out on some pretty crucial stuff, like rollup escape hatches, bridge message validators, and account-abstraction paymasters. Trust me, these components can be pretty high-risk! A smart move is to kick things off by jotting down all your assets and figuring out the trust assumptions for each part of your stack.

1.1 EVM smart contracts (Solidity/Vyper)

Primary risks: There are a few important things we need to keep an eye on. First up, we’ve got the potential for misconfigurations in upgradeable proxies, whether it’s UUPS or the transparent ones. There’s also the chance of storage collisions popping up from ERC‑1967, which we definitely want to avoid. Additionally, we need to be aware of reentrancy issues and cross-function state corruption. Just something to keep in the back of our minds! Hey, just a quick reminder to keep an eye out for any authorization gaps with those modifiers. Also, watch out for price-oracle manipulation and invariant violations, especially when the order flow starts to get tricky or adversarial. And don’t overlook those pesky issues with signature and permit misuse--they can really sneak up on you! (eips.ethereum.org).
Some standards to compare yourself to: Hey, have you heard about the OWASP Smart Contract Security Verification Standard (SCSVS)? It's actually getting a makeover in 2024-2025. Definitely something to keep an eye on! It's going to have profiles along with a handy testing guide to go with them! (scs.owasp.org).
By the way, don't forget to watch out for the EEA EthTrust Security Levels v3 that's set to drop in March 2025. It's definitely something to keep on your radar! When it comes to audit depth and staying consistent, make sure you pay attention to this mapping in your report. It's really important! (entethalliance.org).
Heads Up: Just wanted to let you know that the historic SWC Registry isn’t getting updates anymore. Teams should definitely consider syncing their checks with EthTrust and OWASP SCSVS instead. It’s a smart move! (github.com).

1.2 Rollups and L2s

The threats you might face can vary quite a bit depending on the architecture you’re dealing with. When you’re diving into this stuff, you really need to think about a bunch of key points. Things like tackling fraud, understanding validity proofs, and looking closely at the assumptions surrounding the DA layer are super important. Plus, don't forget about upgrade keys, making sure there's censorship resistance, and figuring out those forced-withdraw paths. Oh, and let’s not overlook bridge contracts and ensuring client diversity. It’s a lot to keep in mind, but it’s all essential for a solid approach! If you really want to understand decentralization and trust minimization better, take a look at L2BEAT’s Stages framework (0-2). It’s a great resource that breaks down these concepts based on the different levels of risks we face. (l2beat.com). Hey there! If you need a reliable checklist for client risks, EVM compatibility problems, escape hatches, and data availability assumptions, you should definitely check out Quantstamp's L2 Security Framework. It's a great resource that covers all those bases! It’s super handy! (github.com).

1.3 Bridges and cross‑chain protocols

If you really want to maximize your value, try mixing on-chain verification with some off-chain relayer or committee controls. It’s a smart way to get the best of both worlds. Hey, just a quick reminder to make sure you run those tests for replay attacks and potential reorg situations. Also, don't overlook the entire lifecycle of the nonce and commitment. It's important stuff! Check this out: there was a real-world situation with ibc-go where a timeout-path reentrancy bug popped up. This little issue ended up making it possible to mint indefinitely and drain escrow using those CosmWasm IBC hooks. Crazy, right? Luckily, it got sorted out after someone pointed it out privately, and thankfully, no money was lost along the way.
Just a quick reminder: be sure to include tests for deleting commitments and checking the order of callbacks. It's important to get those covered! (asymmetric.re). Hey, so it turns out that when it comes to bridge exploits, research shows that design flaws in architecture happen way more often than just simple coding errors. It's really important to test out your architecture choices, whether you're leaning towards a light client, multisig, or optimistic setup, right alongside your code. (arxiv.org).

1.4 Oracles and interoperability networks

You can think of oracles like crucial third-party infrastructure. They play a key role in connecting different systems and providing important data. When thinking about Chainlink CCIP, it’s smart to think about a dual-layer defense strategy. This means mixing in OCR with a dedicated Risk Management Network. By doing this, you can keep different groups of nodes separate and make sure you’ve got a diverse lineup of operators. It’s all about layering your defenses to keep things secure! Don't forget to double-check those attestation paths on-chain, okay? Hey, just a quick reminder to keep an eye on those vendor security certifications! You know, things like ISO 27001 or SOC 2 when you’re looking at CCIP and Data Feeds. It's super important to make sure they’ve got those bases covered! (blog.chain.link).

1.5 Account abstraction (AA)

By 2025, we can expect to see ERC-4337 (that’s the EntryPoint on-chain) and EIP-7702, which brings us those “smart EOAs,” working together seamlessly. Exciting times ahead! Hey, when diving into threat models, it’s super important to think about things like bundlers, paymasters, and how the mempool works. They all play a big role in the bigger picture! Hey, did you know that according to Ethereum.org, there are more than 26 million smart wallets floating around? And get this, there are a staggering 170 million UserOperations! That's pretty wild! Don't forget to use the production telemetry to create realistic test volumes and run your DoS checks. And hey, always make sure you're on the same page with the EntryPoint version you're working with! (ethereum.org).

1.6 Non‑EVM stacks

Solana: When you're working with Solana, it's super important to validate those Anchor account constraints. Don’t forget to take care of PDA seed canonicalization and make sure you're bumping those properly. Keep an eye on authorities, set clear CPI boundaries, and manage those rent and allocation patterns like a pro! If you want to explore this topic further, just click here. Happy learning!
Move (Aptos/Sui): You can really benefit from using the Move Prover. It’s great for mapping out and verifying safety features, like making sure resource rules and access permissions are all in check. Plus, don’t forget to throw in some dynamic testing for good measure! If you’re looking for more details, you can find them here.

2) What “good” looks like: concrete tests that find real issues

So, here are the key test patterns we definitely want to spot in every blockchain pen test for 2025. If you notice they're not included in the plan, don’t hesitate to give your vendor a little nudge about it.

2.1 Upgradeable proxies: storage and authority

Don’t forget to set the ERC-1967 slots and lock them down with the right access controls. It’s super important they stay unchanged! Give messing around with the implementation and admin slots a shot by using delegatecall paths and some clever storage collisions. Hey, could you take a moment to review the UUPS _authorizeUpgrade logic? It’d be great to run through a few scenarios where we could imagine the admin key being compromised. Just want to make sure everything’s solid! (eips.ethereum.org). Alright, here’s the goal you’re working towards: a Foundry test that... You can fork either the mainnet or L2 at the block you choose.
Makes sure the slot is solid by using read proofs to check its integrity.
Attempts to make unauthorized upgrades using example transactions as proof.
It highlights the changes at the byte level, showing what things looked like before and after the attempts.

2.2 Invariants over business logic

Let’s get into Foundry invariant testing! It’s a great way to establish the core truths of your protocol. You want to make sure things like the total of all balances matches the total supply, your AMM is maintaining conservation properly, and that you're staying within your collateralization limits. It’s all about setting up a solid foundation! Why not let those random sequences bring some excitement into the mix? And to really kick things up a notch, combine that with Echidna for property fuzzing and Manticore to tackle those specific symbolic paths. It'll definitely make things more interesting! (learnblockchain.cn). Hey there! Just a heads up: keep an eye out for that "invariants catalog" that’s tied to your economic assumptions. It’ll be super helpful! Also, make sure to set up a CI job that runs those invariants pretty thoroughly. I’d recommend going for something like runs=2,000 and depth=256, and don’t forget to lock in those seeds. It’ll make a difference!

2.3 L2 forced withdrawals and censorship

Hey, just a quick heads up! Remember to kick off a withdrawal when the sequencer is down. It’s also a good idea to keep an eye on things during the challenge windows. And don’t forget to double-check that the escape hatch is working as it should, just based on what’s in the docs - no need to lean on any privileged relayer for that. Stay on top of it! Alright, let’s connect how serious the situation is to the L2BEAT Stage, along with your own Recovery Time Objective (RTO) and Recovery Point Objective (RPO). It’s important to see how these factors play together! (l2beat.com).

2.4 Bridges: replay, lifecycle, and reentrancy across callbacks

If you're diving into IBC-style or message-based bridges, it's super helpful to simulate those timeout and acknowledgment paths using hooks. It can really make a difference! Just a heads-up! Before any untrusted callbacks start running, make sure to double-check that all commitments are deleted. It’s a good way to keep things safe and sound! Make sure to check for reentrancy issues, especially when you're dealing with submessages and those tricky recursive timeouts. When it comes to the ibc-go case study, think of it as your trusty checklist. Your main goal is to make sure that commitment reuse is totally off the table. (asymmetric.re).

If you're diving into oracle-secured interoperability, like CCIP, make sure to double-check that the RMN “blessing/curse” gating is doing its job right on commits. Also, it’s super important that it operates separately from the committing DON. Feel free to give it a shot at mixing in some inconsistent roots and see if you can get past the signature threshold. (research.llamarisk.com).

2.5 AA stacks: bundler/paymaster and 7702 authorization

Alright, let’s get in there and mess with those UserOperations! We need to tackle a few things like validation gas griefing, signature malleability, replay problems across different chains, and those pesky paymaster denials. Let’s make it happen! Hey, just a quick reminder to check out how the fallbacks function when a bundler crashes or when the mempool gets a bit chaotic. It’s super important to know how everything holds up in those situations! When it comes to EIP-7702, let’s really push the boundaries! We should experiment with some unauthorized set-code changes and see if we can get the persistence to extend further than what was originally planned. Sounds like an interesting challenge, right? It’s really important to run this at production-scale volumes so we can spot any rate-limit issues that might pop up with specific IPs, factories, or senders. (ethereum.org).

2.6 Solana and Move specifics

Solana: Alright, let’s dive into those Anchor constraints! We’ve got has_one, seeds, and owner to check out, and we can’t forget about nailing down that PDA bump canonicalization, too. Hey, just a quick reminder--make sure to check for any CPI privilege escalations and realloc races while you’re at it! Make sure that the authorities are straightforward and can be easily taken back whenever needed. Take a look at this link: solana.com. You'll find some really useful info there!
Move: Just a heads up--don’t forget to include specs that focus on resource conservation and access invariants when you're writing. It’s super important! If you come across any counterexamples that aren't working, go ahead and run them through the Move Prover. After that, you can turn those examples into fuzz cases. If you’re looking for more details, check this out: (aptos.dev). You’ll find a ton of useful info there!

3) Tools that actually surface issues in 2025

Your vendor's toolchain should really mix things up with a combination of static, dynamic, and formal methods.
Sure! Automation can be super handy, but when it comes to those tricky situations that need a bit of a human touch, don’t skip out on doing manual reviews. It really makes a difference!

Static analysis: If you’re looking for quick insights into your code structure, check out Slither! Back in 2025, they introduced Slither-MCP, which really amps up LLM-assisted reviews. It's awesome for sorting through issues and getting some solid refactoring advice. (trailofbits.com).

Hey there! If you're into property fuzzing, you should really check out Echidna. It's perfect for working with Solidity invariants. One of the coolest things about it is its hybrid fuzzing feature, which lets you explore those tricky edge cases that can trip you up. Give it a shot; you might find it super helpful! Plus, Foundry's built-in invariant engine really takes a load off for developers. It makes their lives a whole lot easier! (blog.trailofbits.com).

Symbolic execution: Manticore is super handy when it comes to crafting exploit proofs tailored to specific paths and whipping up inputs. (github.com).
Formal verification: Awesome news! The Certora Prover is now open-source and free to use. This is a fantastic opportunity to help you create strong rules for your high-risk contracts. (certora.com). Make sure to use Move Prover for your Aptos and Sui packages. Oh, and remember to include the Prover.toml file and traces in your artifacts too! (legacy.aptos.dev).
Upgrades and proxies: If you're diving into OpenZeppelin, those upgrades plugins are a must-have! They really help you validate UUPS, transparent, and beacon setups directly in your CI, making your life a lot easier. (docs.openzeppelin.com).
Checking things out and the supply chain: Alright, so here’s the deal: the Sourcify APIv2 and its repository are super important if you want to make your source verification easy to replicate. You’ll want to aim for what they call an “Exact Match” for your bytecode and metadata. Plus, don’t forget to link the ABIs from the metadata into your Software Bill of Materials (SBOM). It’ll help keep everything in sync! (docs.sourcify.dev). Make sure to keep tabs on SLSA provenance checks for your CI artifacts, especially those that include validators, relayers, and bundlers. (github.com).
Monitoring/operations: Hey everyone! Just wanted to give you a quick heads up: OpenZeppelin Defender is going to be phased out. So, if you're thinking about signing up, make sure to do it before June 30, 2025, because after that, no new sign-ups will be allowed. And just a reminder, the whole thing is set to shut down on July 1, 2026. Hey, just a heads up! When you're mapping out your plans for 2025-2026, don’t forget to include the migration to an open-source Relayer/Monitor. Also, it’s a good idea to set up some self-hosted alerting while you're at it. It’ll make things way easier down the line! (blog.openzeppelin.com).

4) Prioritize with the right severity models

Don't forget to use CVSS v4! A solid method for scoring vulnerabilities in a modern and consistent way is definitely a must. When you're diving into DeFi, it's crucial to think about stuff like "subsequent system" impacts and other helpful metrics too. Things like Automatable and Value Density can really make a difference! Hey, just a quick reminder to make sure you link each finding to a CVSS-BTE vector and also note its impact on the business. It’s really important to keep everything connected! Check it out here.

Before you dive into those bounties, make sure to line everything up with Immunefi’s latest severity model. It’s super helpful to stay on top of that! Hey, just a quick reminder: they’re slowly getting rid of the old pages, so make sure you check out the latest guidance when you’re putting together your disclosures. It’ll help keep everything up-to-date! For more details, just click here. It's a great resource!

So, what's all the commotion about? Honestly, it's pretty clear that macro risks are starting to climb. In 2024, we noticed it was roughly around $2. Can you believe it? A staggering $2 billion was lost in just 303 hacks, and here we are in the first half of 2025, already on track to surpass that number. It's mainly due to some huge service breaches that have really shaken things up. So, that's why it’s super important for your pen test to really zero in on how far a private key compromise could go and to look out for any hiccups that might pop up because of centralized dependencies. (chainalysis.com).

5) Deliverables to demand (and why they matter)

These days, if your blockchain pen test only hands you a PDF, it's just not enough. Make sure you're picking up artifacts that fit easily into your engineering and SRE workflows.

5.1 Executive summary for decision‑makers

Here's a quick rundown of the risks we’re facing with our business operations. We need to think about which trust assumptions could potentially fall apart. Let’s also look at our exposure levels--like total value locked, number of users affected, and partners impacted. Plus, we should figure out how long it might take to sort things out and who’s responsible for taking the lead on fixing these issues. Let’s talk about the L2 readiness check. Right now, we’re somewhere between Stage 0 and Stage 2, and I want to take a closer look at what’s keeping us from moving up the ladder. Whether you’ve got your own rollup going or you’re depending on someone else’s, it’s important to pinpoint those roadblocks that might be holding us back. (l2beat.com).

5.2 Threat model and asset inventory

Alright, let’s break this down a bit. First off, we want to map out the trust boundaries -- basically, the limits of where we can rely on certain systems. Next, let’s talk about those authority keys; they’re super important for controlling access.

Now, when it comes to upgrade flows, we need to sketch out how updates will roll out smoothly. We can’t forget about off-chain dependencies, which are those external factors that could impact our system.

Then, we’ll touch on the DA layers -- think of these as the different levels that add depth to our architecture. Finally, let’s connect the dots with cross-chain connections; these are crucial for ensuring everything works well together, especially when interacting with other chains.

Hope that gives you a clearer picture!

Put together a clear assumption table. For instance, you might want to note something like “RMN needs to give the thumbs up on commits” for CCIP-based bridges. And for optimistic rollups, you could say, “the challenge window should be at least X.” If you're looking for more details, check out this link: (research.llamarisk.com). There’s a lot of great info there!

5.3 Reproducible exploit proofs

We've put together a pretty robust Foundry test suite that covers:. Alright, so we’re talking about stuff like mainnet and L2 forks, plus some cool seed-based fuzz tests and invariant tests. These are all important tools in the toolbox! Oh, and we’ve also connected any failing assertions to their specific issue IDs.

We’ve got some proxy slot reads and a few proof-of-concept exploits lined up for every upgradeable contract. Take a look at this link: (eips.ethereum.org). You might find it interesting! We're diving into some Echidna campaigns that spotlight properties and seeds, and we're also working on Manticore workspaces. These will help us develop some cool symbolic proofs of concept. If you're interested in diving deeper into that topic, check it out here: blog.trailofbits.com. It’s definitely worth a read! When it comes to bridges, we’re using scripts to handle things like replay, timeout, and acknowledging flows. This helps us make sure there’s no reentrancy or reuse of commitments. For systems like CCIP, we've also shown that inconsistent roots just can't get the green light. If you’re looking for more info, you can check it out here: (blog.asymmetric.re).

5.4 Standards mapping and compliance checks

We’ve put together some tables that illustrate how our findings match up with the OWASP SCSVS controls and the EEA EthTrust v3 requirements. On top of that, we’ve included coverage percentages so you can easily spot what’s still untested or outside the scope. Take a look at this: (scs.owasp.org). You might find it interesting!

5.5 Signed remediation PRs and retest

PRs that have been approved by reviewers and show test differences that indicate the invariants are working well. Hey there! Just a quick heads-up: make sure to include the latest retest letter that confirms the fixes for the deployed addresses. Oh, and don’t forget to attach the Sourcify verification links for any of the upgraded implementations too!
(docs.sourcify.dev).

5.6 Operations runbooks and guardrails

Kill-switch playbooks: So, this covers those essential multi-signature actions such as pausing things, rate-limiting, and turning off certain features. It also lets you know who's on-call to tackle these tasks when they come up.
Monitoring Rules (Self-Hosted): Get those event filters going! You’ll want to keep an eye on stuff like privilege changes, emergency functions, any weird minting or burning activity, changes in L2 bridge status, and any oddities with the CCIP RMN. This way, you’ll catch anything that seems off! We're switching to open-source Monitor/Relayer stacks because it looks like Defender is on its way out. If you want to dive deeper into this, just head over to this link: OpenZeppelin Blog. There's some really great info waiting for you!

5.7 Bounty and disclosure readiness

We've got some severity mapping and triage templates that match up nicely with what Immunefi is currently recommending. Take a look at the suggested max payout ranges, which are based on the impact class and the public scope statement. If you're curious to dive deeper into it, just check it out here: immunefisupport.zendesk.com. It’s got all the details you need!

6) Practical examples you can borrow today

ERC‑1967/UUPS hardening checklist

Just a quick reminder to double-check that the implementation and admin slots match up with the spec. Make sure to double-check that no outside requests are reaching _authorizeUpgrade unless they come through your secure route. We want to keep things safe! Make sure to fuzz test those initializer and upgrade paths so we can dodge any re-initialization headaches down the line. Oh, and don’t forget to include a Foundry test that tackles that known proxy-clobber pattern. We want to show that it doesn’t actually work, so let’s make sure it’s in there! (eips.ethereum.org).

Rollup escape hatch verification

If you're working with a forked setup, go ahead and pause the sequencer for a bit. Then, you can try running some forced withdrawals. Just a heads-up, we need to ensure that the proof generation, challenge window, and L1 finalization all run smoothly. Let’s keep things straightforward and avoid using any privileged relayers in the process. So, if your L2 is in Stage 0 or 1, it’s super important to watch out for how many keyholders you have and the time it takes to hit pause. These factors can really impact your operations, kind of like the CVSS supplemental things called “Provider Urgency” and “Recovery.” Just something to keep in mind! (l2beat.com).

Example C -- IBC timeout reentrancy regression test

Alright, here’s what you need to do: Create a test setup that reflects what we’ll have in the April 2024 class. You'll want to trigger those timeout callbacks and experiment with recursive MsgTimeout using hooks and submessages. Oh, and don't forget to ensure that any commitment deletions take place before the callback fires off. So, if there’s any bump in escrow balances or if IBC denoms get created without burning an equal amount, then the test is supposed to fail. Let’s make sure we keep this as a regular check in our continuous integration setup. (asymmetric.re).

Example D -- Account abstraction abuse cases

Create UserOps that: Make the most of the differences in gas fees when it comes to paymaster validation. You can replay transactions across different chains by using the same calldata, just make sure to swap out the chain IDs.
Take advantage of those 7702 delegation windows to hang onto your code a bit longer than you might have planned.
Run tests at a scale similar to what you'd see in production to uncover any weaknesses in how the mempool and bundler handle things. Also, make sure to check that the EntryPoint version assumptions in your tests are spot on. (ethereum.org).

Example E -- Oracle/CCIP vendor due diligence

Hey, don’t forget to grab the SOC 2 and ISO 27001 evidence for the services you depend on, like Chainlink CCIP and Data Feeds. It’s super important! Hey, could you take a moment to double-check the RMN independence controls? Thanks! Hey, just a quick reminder to make sure you include those attestations and the on-chain verification steps in your appendix! You can find some helpful info here.

7) Emerging best practices for 2025 roadmaps

You can think of "monitoring and response" like a set of instructions or code. Hey there! If you’re thinking about making the switch from Defender to open-source Monitor/Relayer stacks, it’s a good idea to start planning that out between Q1 and Q3 of 2026. Just a little heads up to help you get things rolling! It's a good idea to weave alerts and automatic pausing right into your CI/CD processes alongside your code reviews. Relying solely on dashboards isn’t the way to go. Trust me, having these features built into your workflow can really make a difference! (blog.openzeppelin.com).

Start incorporating formal methods right from the beginning stages. When it comes to your highest-risk modules, make sure to use Certora Prover. And for those Aptos and Sui packages, don’t just sit back and wait until everything’s done--go ahead and incorporate Move Prover while you're working on your feature pull requests. It's a good way to catch any issues early! (certora.com).

Just double-check that everything you put out there is fully verified. Make sure to use Sourcify’s “Exact Match” for all your contracts, and don’t forget to include ABIs and metadata in your Software Bill of Materials (SBOM). It’s super important for keeping everything organized! If the verification process isn't reproducible, your CI should definitely throw an error. (docs.sourcify.dev).

Make sure your risk assessment lines up with the actual loss trends we're seeing in the real world. According to data from Chainalysis, things can really shift in the landscape, especially after a couple of big breaches. Think about including some tabletop exercises for private-key compromises and beefing up your infrastructure in your plans. Even if your on-chain code is spot on, it's always good to be prepared! (chainalysis.com).

8) How to buy a great blockchain pen test (a short checklist)

Scope: So, here's what we're diving into: contracts, rollup bridges, and escape hatches, along with oracles and how everything connects. We’ll also cover the AA stack and the ops runbooks.
Method: We're getting creative with our approach! We're combining Slither, Echidna, Foundry, and Manticore, and we’re also throwing in some formal tools like Certora and Move Prover for good measure. And hey, we’ll also include some architectural reviews using the L2BEAT and Quantstamp frameworks, just to give you that extra layer of insight! Take a look at this: (trailofbits.com). You might find it interesting!
What You’ll Get: Get ready for some hands-on stuff! We’ll deliver reproducible tests and proofs of concept (POCs), along with a solid mapping of standards (we’re talking about OWASP SCSVS and EthTrust v3). You'll also see CVSS v4 vectors, a few remediation pull requests, and a retest letter. Plus, we’ll throw in some monitoring rules and templates to help you out with your bounty programs. More info here: (scs.owasp.org).
Important Dates: Don’t forget to check in with your vendor about EIP-7702 launching with Pectra on May 7, 2025. Also, give them a heads-up that Defender will be sunsetting by July 1, 2026. It's important they’re aware of these timelines! These changes are really important for your architecture and operations plans.
If you want to dive deeper into this topic, check out the details over at ethereum.org. It’s got some great info!

Final word

Pen testing blockchain systems in 2025 really means taking a good hard look at all your assumptions. You’ve got to keep questioning things at every boundary, whether that's the code, consensus mechanisms, cross-chain interactions, or even day-to-day operations. It’s about digging deep and staying curious! It's super important to roll out fixes that can actually deal with real-life traffic and potential threats. With all the models, tools, and deliverables we've discussed, you’ll be able to avoid those frustrating checkbox audits. Instead, you'll make real progress in reducing risks before the next incident decides to show up.