Smart contract formal verification from specialist firms
Prove your critical properties hold in every reachable state, not just the ones tested.
- in RFP budgets posted
- $1.2M
- saved, 44.5% vs single direct quotes
- $525K
- vetted firms quoting on the platform
- 70+
- first quotes typically land within the hour
- <1 hour
How smart contract formal verification works
25firms on Procur3 offer formal verification.
CredShields
HackenProof
Coinspect
KannAudits
Quantstamp
Hacken
Consensys Diligence
OtterSec
Sherlock
Shred Security
Hexens
Nethermind
Veridise
No.Witness Labs
HYDN Security- +10 more
How it works
Get formal verification quotes- 01
Post
Share the contracts and the properties you care about.
- 02
Compare
Specialists quote with properties, method and team.
- 03
Select
Award the work and track delivery in one place.
When you need formal verification
Most protocols don't need it for everything. It earns its cost on a few properties where a single failure is catastrophic.
- Your protocol has invariants like solvencyTotal assets must always cover liabilities, in every state.
- You rely on non-trivial mathsAMM curves, interest models and pricing break in rare cases.
- You're upgrading or optimising live codeEquivalence proofs show behaviour didn't change.
- The value at stake is very largeThe cost of a missed bug outweighs the cost of the proof.
Procur3 fills a gap no other platform serves: matchmaking between protocols and audit firms. No rounds of calls just to get a quote — for our Base contracts we compared multiple high-quality providers at once and weighed their strengths per project. We'll keep doing business with them.
Security isn't an afterthought for TermMax. Thanks @procur3 for helping us run a clean RFP to find specialized Daml auditors ahead of our Canton Network launch.
Frequently asked questions
What is formal verification of smart contracts?
Formal verification uses mathematical methods to prove that a smart contract satisfies a written specification for every possible input and state. Where testing checks chosen cases, a proof covers all of them, within the assumptions it states.
What's the difference between formal verification and a smart contract audit?
A smart contract audit is a broad manual review that looks for any kind of bug. Formal verification proves specific properties hold. Audits find issues nobody wrote a property for; proofs rule out entire classes of failure for the properties they cover. High-value protocols use both.
Does formal verification prove a contract is secure?
It proves the stated properties hold under the stated assumptions. A wrong or incomplete specification, an unrealistic assumption, or a bug outside the properties can still cause a loss.
Which languages can be formally verified?
Solidity and EVM bytecode have the most tooling, including the Solidity compiler's SMTChecker and symbolic tools like Halmos and hevm. Move has the Move Prover. Rust programs and protocol designs can be verified with model checkers and proof assistants, usually by specialists.
Should formal verification happen before or after an audit?
Usually alongside or after, once the code is stable. Writing the specification often surfaces design issues early, so some teams start it during development.
Is it free to request quotes?
Yes. Posting a request and comparing quotes is free. You agree the price and terms with the firm you choose.