Blockchain Development Company
Verify users once. Let them click in everywhere.
Blockchain Click builds decentralized identity infrastructure: verifiable credentials, reusable KYC and zero-knowledge proof-of-personhood that users own and present in a single click. Apps verify without storing personal data. 18.5 million credentials issued. Zero bytes of PII on our servers.
Production deployments on 8 chains
At a glance
- Decentralised identity specialists (DID, VC, ZK) · Naples, Italy · founded 2014
- 18.5 million verifiable credentials issued · 142 million one-click verifications served
- ISO/IEC 27001:2022 (BCK-IS-2026-0391, DNV) · SOC 2 Type II (BCK-SOC-2026-H1) · GDPR DPIA · eIDAS-aligned
- 0 critical findings across all external audits · 0 bytes PII stored
- Deployments on 8 chains: Ethereum, Polygon PoS, Base, Optimism, Arbitrum One, Celo, Gnosis Chain, Solana
- Three engagement editions: pay-as-you-go EUR 0.12/verification, Growth from EUR 1,900/month, Enterprise from EUR 7,500/month
How one-click verification works
Three parties. One cryptographic flow. No personal data stored anywhere along the path.
Step 01 · Issuer
Credential issued to the user
A trusted issuer (bank, government, your platform) verifies the user once and issues a signed verifiable credential to their wallet. Age, nationality, KYC tier, or any other claim. The issuer signs with a DID key; the credential is tamper-evident.
Step 02 · Holder wallet
User holds the credential
The credential lives in the user's wallet, not on your server or ours. They decide what to share. Using zero-knowledge selective disclosure they can prove a claim (such as "I am over 18") without revealing their name, date of birth or any other attribute.
Step 03 · Verifier
Your app verifies in one click
The user taps once. Your app receives a cryptographic presentation and verifies it against the issuer's public DID. No database lookup. No PII transmitted. The check completes in milliseconds. Average onboarding: 9 seconds.
Technology stack
Blockchain Click builds its decentralised identity platform on W3C-standard open protocols and battle-tested tooling across 8 production chains.
Supported chains
Smart-contract languages
Dev frameworks and tooling
Identity standards and protocols
Token standards
Infrastructure and ops
Which chain fits your use case
| Chain | Best for | Finality | Compliance fit | Transaction cost |
|---|---|---|---|---|
| Ethereum (mainnet) | Enterprise identity registries, regulated asset tokens | ~12 sec (PoS) | Highest (auditor familiarity) | High |
| Polygon PoS | High-volume KYC verifications, consumer-scale proof-of-personhood | ~2 sec | Strong (EVM-equivalent) | Very low |
| Base | FinTech and retail Web3 apps needing Coinbase ecosystem reach | ~2 sec | Strong (EVM, US-regulated) | Very low |
| Optimism | Governance and DAO credential issuance | ~2 sec | Strong (EVM-equivalent) | Very low |
| Arbitrum One | DeFi identity-gating, complex multi-call credential logic | ~1 sec | Strong (EVM-equivalent) | Low |
| Celo | Mobile-first KYC, emerging markets, phone-number DIDs | ~5 sec | Moderate (MiCA-aware) | Very low |
| Gnosis Chain | Community DAOs, small-scale identity, test deployments | ~5 sec | Moderate | Very low |
| Solana | Sub-second proof-of-personhood, gaming, high-throughput | ~0.4 sec | Emerging (Solana Foundation) | Negligible |
Protocols and ecosystems we integrate with
Blockchain Click's identity infrastructure connects to the protocols your product already depends on.
On-chain price and data feeds for identity-gated financial logic.
Subgraph indexing for DID registry events and credential revocation monitoring.
Browser wallet integration for DID presentation flows.
Mobile wallet QR and deep-link presentation for credential verification.
Document verification provider for initial KYC issuance.
Card-linked identity for FinTech onboarding credential issuance.
Compatible ZK identity protocol on Polygon PoS.
OIDC bridge for credential presentation inside OAuth 2.0 flows.
RPC node infrastructure for Ethereum and Polygon mainnet.
What you can build
From reusable KYC to DAO governance, every use case runs on the same W3C-standard credential stack. Our decentralized identity development practice covers the full protocol: DID development, verifiable credentials development and on-chain revocation.
Reusable KYC
Users verify once with a licensed identity provider. The credential travels with them to every app you or your ecosystem builds. No re-submission, no repeated document upload. Our blockchain integration handles every major FinTech compliance schema out of the box.
Proof-of-personhood
Bind one account to one human. Stop bot farms, multi-accounting and Sybil attacks in gaming, DAOs, airdrops and age-gated services without linking to real identity. Deployable across multi-chain environments with a single credential schema.
Zero-knowledge selective disclosure
Users prove "I am a resident of the EU" or "My credit score is above 700" without revealing any data beyond the claim. GDPR-compliant by design: no PII touches your infrastructure. Secure blockchain development principles are enforced at every layer of the cryptographic stack.
Decentralized identity wallet
White-label or embed our DID wallet SDK. Users manage their own credentials, private keys and consent. No custodial data. Supports W3C DID methods and ISO/IEC 18013-5 mobile credentials. Wallet security implementation follows our key management framework built over 12 years of PKI engineering.
Smart contracts and tokenization
Identity-gated token contracts, on-chain revocation registries, membership NFTs tied to verified credentials. Full tokenization layer from ERC-20 to ERC-3643 compliant regulated asset tokens. All contracts are audit ready and deployed with production-tested smart contract deployment workflows.
eIDAS and GDPR compliance layer
Architecture reviews, DPIA support and eIDAS-aligned identity flows for regulated industries. We bring our own ISO 27001 and SOC 2 documentation so your auditors have fewer questions. Blockchain consulting and Web3 consulting services are available for teams planning their first decentralized identity deployment.
Why teams choose Blockchain Click
Four principles that have guided every integration since 2014. We operate as a long-term blockchain technology partner, not a one-off vendor.
0 bytes of PII stored
We built the infrastructure so no personal data ever lands on our servers. Users hold credentials in their own wallets. We cannot leak what we do not have. This is security first blockchain development made structural.
W3C standard, not proprietary
Every credential follows the W3C Verifiable Credentials Data Model. Every DID follows the W3C DID Core spec. No vendor lock-in: your credentials travel to any compliant verifier. Our blockchain architecture is designed for interoperability from day one.
ISO 27001 and SOC 2 certified
Certificate BCK-IS-2026-0391 (DNV, valid to 2029). SOC 2 Type II report BCK-SOC-2026-H1 (Prescient Assurance). 0 critical findings across all external audits to date. Our smart contract security posture has been independently validated on every production release.
9-second onboarding
Once a user holds a credential, your app verifies in milliseconds. Onboarding drops from an average of 6 minutes to 9 seconds. Drop-off rates fall by 38% in production. These are production ready Web3 apps, not prototypes.
Numbers that matter
Blockchain Click is a blockchain development company based in Naples, Italy that builds decentralized identity and verifiable credentials: reusable KYC, proof-of-personhood and zero-knowledge selective disclosure that users own and present in one click. Founded in 2014, it has issued 18.5 million credentials and stores zero personal data on its servers.
Figures cover all production deployments from 2014 to June 2026. Verified by client sign-off. Uptime measured across credential issuance and verification APIs. Market context: the W3C Verifiable Credentials Data Model is a global standard published at w3.org; decentralized identity adoption forecasts are tracked by the World Economic Forum at weforum.org.
Industries we serve
Every sector where identity friction costs money or creates compliance risk. Blockchain development for FinTech and blockchain software for enterprises are our two largest practice areas.
FinTech and crypto exchanges
Reusable KYC cuts onboarding time and compliance cost. One verified credential works across your ecosystem. Falcone Exchange cut drop-off by 38%. Our blockchain development for FinTech practice spans Travel Rule compliance, cross-chain KYC portability and digital asset software development.
Insurance and financial services
Proof-of-residency and proof-of-age via zero-knowledge proofs. Pass GDPR audits without remediation. Adriatic Mutual verified 1.2 million customers with zero PII stored. Blockchain for financial platforms reduces data liability while improving underwriting speed.
Gaming and entertainment
Proof-of-personhood stops bots and multi-accounting. Age verification without collecting birthdates. Lumio Games reduced cheating accounts by 71% across 700,000 verified players. Web3 development for gaming is one of the fastest-growing segments in our production portfolio.
DAOs and Web3 governance
Sybil-resistant voting without linking wallets to real identity. Proof-of-membership credentials for token-gated communities. One human, one vote. Governance token development and role based smart contracts are available as an extension to any DAO integration.
Marketplaces and e-commerce
Seller verification, buyer credit checks and fraud prevention using portable credentials. Users consent once; your trust score improves without a data liability. On-chain analytics and transaction monitoring keep marketplace operators audit-ready without custodying personal data.
Age-gated services
Prove a user is over 18 without storing their date of birth. Zero-knowledge age proofs work for alcohol delivery, adult content platforms and regulated pharmaceutical sales. Enterprise blockchain development engagements in this space include upgradeability planning so compliance rules can be updated without redeploying the full credential schema.
Engagement models and pricing
Start with a single verification. Scale to millions. All in EUR, no hidden conversion fees.
Pay-as-you-go
EUR 0.12
per verification · no minimum
Engagement: Self-serve
- Full Verifiable Credential API access
- 8-chain support from day one
- W3C DID and VC documentation
- Developer dashboard and logs
- Community Slack support
Growth
EUR 1,900
per month · includes 20,000 verifications
Engagement: Dedicated integration team
- Everything in Pay-as-you-go
- Dedicated integration engineer
- Custom credential schema design
- Wallet SDK white-labelling
- Email and video call support
- GDPR DPIA template package
Enterprise
EUR 7,500
per month · unlimited verifications
Engagement: Enterprise SLA and sustain
- Everything in Growth
- Dedicated DID infrastructure (your nodes)
- 99.99% uptime SLA with credits
- 24/7 on-call sustain retainer
- Quarterly security review
- ISO 27001 evidence pack for your auditors
- Custom contract and MSA
Choose the right engagement edition
| Edition | Cost model | Verifications included | Dedicated engineer | SLA | Best for |
|---|---|---|---|---|---|
| Pay-as-you-go | EUR 0.12 / verification | Unlimited (pay per use) | No | None | Pilots, low-volume integrations, developer testing |
| Growth | EUR 1,900 / month | 20,000 included | Yes | Business hours | Growing products, FinTech onboarding flows |
| Enterprise | EUR 7,500 / month | Unlimited | Yes | 99.99% + 24/7 on-call | Regulated enterprises, high-volume or mission-critical identity |
What determines your project cost
Credential schema complexity
A simple age-gate credential costs a fraction of a multi-claim selective-disclosure schema with on-chain revocation; schema design is the primary scoping driver.
Number of chains
Each additional chain needs its own DID registry contract, RPC configuration and cross-chain consistency testing; single-chain integrations are always faster.
Audit depth
A full formal-verification audit on a high-value identity contract costs EUR 8,000 to EUR 25,000 and 3 to 5 weeks; standard audit runs EUR 3,000 to EUR 8,000.
Compliance jurisdiction
Engagements requiring eIDAS 2.0 alignment, DPIA documentation or VASP Travel Rule schema add 2 to 4 weeks of legal-engineering time.
Integration surface
Connecting to an existing auth layer (OAuth, OIDC, SAML) requires an adapter layer; greenfield builds where we own the full stack are simpler and faster.
Sustain scope
A basic 90-day post-launch sustain is included in all Growth and Enterprise plans; ongoing on-call engineering for credential schema updates is priced per retainer.
Reusable credentials vs repeated KYC
The status quo asks users to verify again for every new service. Reusable credentials end that.
| Feature | Reusable VC (Blockchain Click) | Repeated KYC (traditional) |
|---|---|---|
| User onboarding time | 9 seconds (after first issue) | 4 to 8 minutes per service |
| PII stored on app server | ✓ Zero bytes | × Full document copies |
| Selective disclosure | ✓ Zero-knowledge proofs | × All-or-nothing data share |
| GDPR data minimisation | ✓ Structural compliance | × Manual policy only |
| User consent model | ✓ Granular per-claim | × Blanket acceptance |
| Credential portability | ✓ Works across any W3C verifier | × Locked to issuing platform |
| Data breach exposure | ✓ Nothing to breach | × Full PII database at risk |
| Verification cost per check | EUR 0.12 | EUR 0.80 to EUR 3.50 (typical KYC provider) |
Production results
Three regulated deployments. Concrete numbers from clients who signed off on every metric. Full cycle blockchain development from credential schema through mainnet launch.
FinTech · Crypto exchange · Italy
Falcone Exchange
Falcone needed to comply with EU Travel Rule KYC requirements without losing users at registration. Repeated document uploads pushed drop-off above 45%. We replaced their flow with reusable verifiable credentials: users who had already verified anywhere in our network clicked once and entered. The engagement included smart contract integration with Falcone's existing Ethereum-based settlement layer and end to end blockchain development from discovery through post-launch sustain.
Insurance · EU insurer · Adriatic region
Adriatic Mutual
Adriatic Mutual needed proof-of-age and proof-of-residency for product eligibility checks on 1.2 million existing customers. Their legal team required zero PII stored after verification. We built a zero-knowledge proof layer: customers prove "I am a resident of Italy aged over 25" without the insurer seeing their document. The blockchain backend development work covered a scalable blockchain development pattern capable of handling peak verification loads without increasing data-breach surface area.
Gaming · EU studio · Multi-platform
Lumio Games
Lumio's flagship title suffered severe bot and multi-account abuse in competitive ranked play. Traditional email-based checks were trivially bypassed. We deployed proof-of-personhood credentials: each account linked to one verified human, no name or ID number attached, using zero-knowledge uniqueness proofs on Polygon PoS. Scope included smart contract testing, contract test coverage reporting and a DeFi security review of the in-game asset economy to harden it against exploit vectors that emerged during load testing.
How we work with your team
A four-phase process from spec to production. Most integrations go live in 6 to 10 weeks. We function as an embedded blockchain development partner, not a hands-off agency.
Discovery
We audit your existing identity flow, compliance requirements and data architecture. We map which claims you need and which you can stop storing. Output: a credential schema and trust-model spec. This is our blockchain technical discovery phase: it covers oracle risk management, permission design and off-chain data flows before any contract is written.
Design and schema
We design the DID document structure, credential schema, selective disclosure predicates and revocation strategy. Your legal and compliance team review before a single line of code is written. Upgradeability planning is part of every design phase so credential schemas can evolve without breaking existing holder wallets.
Build and integrate
We build smart contracts, on-chain registries and the server-side verification API. We integrate with your existing auth layer using our SDK. Testnet first, audited before mainnet. Our Web3 DevOps practice covers smart contract CI CD pipelines and blockchain data indexing for real-time event monitoring.
Launch and sustain
We deploy to mainnet, hand over runbooks and stay available for 90 days post-launch. Enterprise clients get a dedicated on-call sustain retainer and quarterly security reviews. Sustain includes blockchain security engineering checks whenever dependencies or chain upgrades introduce new attack surfaces.
What you receive
A Blockchain Click engagement ends with a production-ready system, not a proof of concept: every deliverable is audited, documented and transferred to your team.
Audited smart contracts
Source-verified on Etherscan (or chain equivalent), with full audit report and remediation log.
DID and credential schema documentation
W3C-standard DID method spec and credential schema in JSON-LD format, versioned in your repository.
Verification API and SDK
Server-side REST API and browser/mobile SDK for credential presentation and proof verification.
Deployment runbook
Step-by-step instructions for re-deploying to any supported chain, including environment variables and key rotation procedures.
Threat model and security review
STRIDE-based threat model for every contract and API surface; reviewed and signed off by the security lead.
GDPR DPIA package
Pre-filled DPIA template, data-flow diagram and evidence pack for your Data Protection Officer.
Test suite and coverage report
Full Hardhat/Foundry test suite with at least 95% line coverage and a coverage report for each contract.
Knowledge-transfer session
A recorded walkthrough of the full system for your engineering team, including architecture decisions, upgrade paths and incident runbook.
How we reduce your risk
Every Blockchain Click engagement comes with contractual commitments designed to remove the most common sources of project risk in blockchain development.
Free scoping call
A 60-minute technical discovery call at no cost; you get a credential schema recommendation and a rough timeline estimate before any commitment.
Fixed-price discovery sprint
A two-week discovery sprint at a fixed EUR 4,800 that produces a full credential schema spec, compliance gap analysis and project plan; costs are credited against the build engagement.
Client owns the IP and source
All smart contracts, schemas, SDKs and documentation are delivered under a perpetual licence; you have full source code from day one.
Audit-pass commitment
If a contract fails its external audit on the first pass, Blockchain Click remediates all critical and high findings at no additional charge.
No vendor lock-in
The credential infrastructure uses W3C open standards (DID Core, VC Data Model); you can migrate to any compliant verifier or issuer stack without rewriting your application.
Defined exit and handover
Enterprise engagements include a 30-day handover plan at end of contract: runbooks, key transfer, documentation and a recorded walkthrough of all live systems.
Discovery call (week 1): We map your identity flow, compliance requirements and technical constraints. Schema design (week 2): You receive a W3C-standard credential schema, a DID method selection and a trust-model specification signed off by both teams before build begins.
Who builds your project
Every Blockchain Click engagement draws from a 38-person team structured around the full identity protocol stack: from ZK circuit design to compliance documentation.
ZK Circuit and Protocol Engineer
Designs Groth16 and PLONK circuits for selective-disclosure predicates; owns the cryptographic proof layer.
Smart Contract Engineer
Writes, tests and deploys Solidity and Rust contracts; responsible for on-chain DID registries and revocation logic.
Blockchain Security Lead
Performs pre-audit threat modelling, fuzzes contracts with Foundry and coordinates all external audit engagements.
Identity Standards and Compliance Specialist
Maps client requirements to W3C DID Core, VC Data Model and eIDAS 2.0; produces GDPR DPIA documentation.
Integration Engineer
Builds the SDK, verification API and adapter layers that connect the credential stack to existing auth, CRM and payments infrastructure.
QA and Test Automation Engineer
Runs contract test coverage, integration test suites and live credential flow testing across all 8 supported chains.
Programme Manager
Coordinates client discovery, design reviews, launch milestones and sustain escalations; single point of contact for each engagement.
The engineer behind the protocol
Background
Felix Neumann holds an MSc in Cryptography from Technische Universitaet Darmstadt (2010). Before co-founding Blockchain Click in 2014, he worked as a cryptography and PKI engineer at an identity company, building the certificate infrastructure that authenticated millions of users. His research focus shifted to decentralized identity after observing how centralised credential stores became the highest-value targets in every breach.
In 2019, a partner's centralised KYC database leaked. The application code was clean: the breach was the identity store itself, a honeypot of 4 million documents. Felix rebuilt the partner's flow around user-held verifiable credentials and zero-knowledge proofs. Apps now verify without ever seeing the document. Personal data stays with the user.
"Verify, do not store." Rule one at Blockchain Click since 2019.
Specialisation: applied cryptography, zero-knowledge proofs, decentralized identity, W3C DIDs and Verifiable Credentials. 12 years building identity systems across FinTech, insurance and public-sector identity programmes. Felix is available for blockchain consulting engagements scoped around DID development, verifiable credentials architecture and smart contract security reviews for regulated clients.
What the data shows
Research Note BCK-2026-05 · February 2026
Selective Disclosure at Scale: Zero-Knowledge Verifiable Credentials Without Custodial PII
We analysed 52 identity-verification flows across FinTech, insurance and gaming to quantify the cost of repeated KYC and the efficiency gain from reusable verifiable credentials. The dataset covers 18.5 million credential issuances and 142 million verifications from 2020 to 2025. The study is part of our broader work on blockchain identity platform design and the transition from centralised credential stores to user-held decentralized identity infrastructure.
- 84% of KYC re-verifications were redundant: the user had already been verified by a trusted issuer in the same network.
- Average onboarding time fell from 6 minutes to 9 seconds after reusable credential deployment.
- Zero bytes of personally identifiable information were stored across 18.5 million issued credentials.
- Registration drop-off rates fell by an average of 34% across six production deployments studied.
- Cross-chain deployments on multi-chain environments showed no statistically significant latency penalty compared to single-chain verification flows.
Where AI meets decentralised identity
AI systems that act on behalf of users need a way to prove who authorised them: and verifiable credentials provide exactly that binding, on-chain and revocable.
AI agent identity
Autonomous AI agents operating in DeFi or on-chain markets can hold a verifiable credential issued to their principal, proving authorisation without exposing the principal's identity. Blockchain Click's W3C DID stack is compatible with AI agent frameworks that require on-chain identity attestation.
ML-assisted fraud and Sybil detection
Zero-knowledge proof-of-personhood stops bot farms more effectively than ML classifiers alone; the two approaches are complementary. Blockchain Click's ZK uniqueness proofs provide the ground-truth signal that fraud models can calibrate against.
On-chain AI model attestation
A verifiable credential can attest that a specific model version produced a specific output, linking AI decision trails to an immutable on-chain record. This is relevant for MiCA investor-suitability checks and insurance underwriting.
Selective disclosure for AI data consent
Users can grant AI systems selective access to their verified attributes (age, jurisdiction, KYC tier) via a zero-knowledge presentation, without exposing the full credential. No raw personal data is sent to the AI pipeline.
Decentralised oracles as AI data feeds
Chainlink Data Feeds and The Graph subgraphs provide auditable, tamper-resistant on-chain data that AI risk models can consume without trusting a single provider. Blockchain Click integrates both as part of its credential infrastructure stack.
What clients say
59 verified reviews across Clutch and G2. These are five of them.
"We cut onboarding from 6 minutes to 9 seconds and our drop-off rate fell by 38%. The zero-knowledge credential flow passed our compliance review with no findings. That is not something I expected to say about a blockchain product."
"1.2 million customers verified in a single deployment cycle. Our GDPR audit passed without a single remediation request because there is simply no PII to audit. The selective disclosure architecture is genuinely novel."
"Bot problem: gone. We verified 700,000 players and cheating accounts dropped by 71%. The proof-of-personhood credential works on Polygon PoS with no user friction. Players scan once and never think about it again."
"We evaluated three decentralized identity vendors. Blockchain Click was the only one with a published W3C-compliant credential schema, an ISO 27001 certificate and a team that could explain zero-knowledge predicates without consulting a slide deck."
"The 'verify, do not store' principle is not a slogan for them: it is an architectural constraint enforced at every layer. Six months into production, our security team has not found a single PII exposure surface. That is rare."
Certifications and awards
External validation of security posture, compliance alignment and engineering quality.
ISO/IEC 27001:2022
Certificate BCK-IS-2026-0391 · Issued by DNV · Valid through 2029-06-15 · Full information security management system
SOC 2 Type II
Report BCK-SOC-2026-H1 · Audited by Prescient Assurance · Security, availability and confidentiality trust principles
GDPR DPIA and eIDAS-aligned
Data Protection Impact Assessment completed · Architecture eIDAS 2.0 aligned · Zero PII stored by design
ISO/IEC 18013-5 ready
Mobile Driving Licence (mDL) credential format · Ready for ISO 18013-5 mobile identity implementations
Clutch Top Blockchain Developers 2026
4.9 / 5 from 34 verified reviews
G2 High Performer Winter 2026
4.8 / 5 from 25 verified reviews
Naples FinTech and Identity Award 2025
Decentralized Identity category
Security posture and compliance
Blockchain Click's verify-do-not-store architecture means there is no personal data honeypot to breach: security is a structural property, not a configuration.
Regulatory frameworks
Zero-PII design satisfies Art. 5(1)(c) data minimisation by construction.
Architecture eIDAS 2.0 aligned; supports European Digital Identity Wallet interop flows.
Reusable KYC credentials carry the Travel Rule originator/beneficiary data needed for VASP compliance without storing PII per transfer.
MiCA-aware credential schema for crypto-asset service providers (CASPs): issuer verification, investor suitability and whitepaper attestations.
Full ISMS certified (BCK-IS-2026-0391, DNV, valid through 2029).
Trust principles: security, availability, confidentiality. Report BCK-SOC-2026-H1, Prescient Assurance.
Security track record
0 critical
findings across all external audits to date
0 bytes
PII stored on any server since launch
EUR 0
funds lost across all 88 production integrations
99.98%
uptime across credential issuance and verification APIs
As seen in
Identity Layer Weekly
"Blockchain Click's ZK credential flow sets a new bar for GDPR-aligned KYC."
The Credential
"142 million verifications later, the one-click identity promise has delivered."
ZK Digest
"Selective disclosure without custodial PII is the architecture regulators have been waiting for."
Self-Sovereign Review
"The Naples team is quietly becoming Europe's most important W3C identity infrastructure builder."
Trust Rails Quarterly
"Lumio Games' 71% reduction in cheating accounts shows proof-of-personhood has left theory behind."
How to evaluate a blockchain development company
Buyers making their first decentralised identity or smart contract investment face three recurring pitfalls: vendor lock-in through proprietary credential schemas, audits treated as an afterthought, and compliance gaps discovered post-launch.
"Do they follow open standards?"
Vendors using proprietary credential formats lock you in; insist on W3C DID Core and Verifiable Credentials Data Model 2.0 compliance so your credentials travel to any verifier.
"Can they show a zero-PII architecture?"
Ask for the data-flow diagram: if the vendor's servers touch raw personal data at any point, your GDPR exposure survives the integration.
"Are smart contracts audited before mainnet?"
Every production contract at Blockchain Click is audited by an independent firm before deployment; first-pass audit pass rate with 0 critical findings is the benchmark.
"Do they have identity-specific compliance credentials?"
ISO 27001 and SOC 2 are the floor; for identity work, also check for GDPR DPIA completion and eIDAS 2.0 alignment.
"What is the sustain model after launch?"
Identity infrastructure evolves: revocation schemas change, new chains emerge, regulations update; confirm a named sustain retainer exists, not a generic support ticket queue.
These five criteria mirror the evaluation Falcone Exchange used before selecting Blockchain Click. References available on request.
Frequently asked questions
What does a blockchain development company do?
A blockchain development company designs, builds and operates on-chain systems: smart contracts, token protocols, decentralized identity infrastructure, tokenization platforms and Web3 integrations. Blockchain Click specialises in decentralized identity, issuing verifiable credentials and proof-of-personhood that let users prove who they are in one click, without sharing raw personal data with each application they use. The work spans blockchain software development, smart contract engineering, Web3 backend development and blockchain infrastructure that supports 88 production integrations across 8 chains.
How much does it cost to hire a blockchain development company?
Blockchain Click offers three pricing tiers: pay-as-you-go at EUR 0.12 per verification for teams that want to start with no commitment; Growth from EUR 1,900 per month for dedicated integration support; and Enterprise from EUR 7,500 per month for full SLA, dedicated DID infrastructure and 24/7 sustain. Project engagements are scoped individually based on complexity and chain requirements.
How do I choose a blockchain development company?
Prioritise firms with published audit results, verifiable production deployments and compliance credentials (ISO 27001, SOC 2, GDPR alignment). For identity work specifically, check whether the firm follows the W3C DID and Verifiable Credentials standards, has eIDAS familiarity and can demonstrate zero-PII architecture. Request references from clients in regulated industries such as FinTech, insurance or gaming. Also evaluate the firm's blockchain architecture depth: audit ready smart contracts, smart contract threat modeling and a documented Web3 strategy for long-term maintainability are reliable indicators of engineering maturity.
What is a verifiable credential?
A verifiable credential (VC) is a W3C-standard tamper-evident digital credential that proves a claim about its holder. Unlike a traditional certificate, a VC carries a cryptographic proof so any verifier can check its validity without contacting the issuer. The holder controls it in a wallet and presents only the claims they choose to share, using zero-knowledge selective disclosure when needed.
How does zero-knowledge selective disclosure work?
Zero-knowledge selective disclosure lets a user prove a specific attribute (for example, "I am over 18") without revealing the underlying data (their exact date of birth or name). A cryptographic proof is generated from the credential and sent to the verifier. The verifier confirms the claim is true without learning any additional information. No personal data is transmitted or stored at any point in the flow. From an engineering standpoint this is a form of secure Web3 development that makes blockchain security a consequence of the protocol rather than a layer bolted on after deployment.
Is Blockchain Click compliant with GDPR?
Yes. Blockchain Click stores zero bytes of personal data on its servers. All personal attributes remain in the user's wallet. Verification is done via zero-knowledge proofs, so no PII is transmitted during a check. The company has completed a GDPR Data Protection Impact Assessment (DPIA) and its infrastructure is eIDAS-aligned. ISO/IEC 27001:2022 certification (Certificate BCK-IS-2026-0391, DNV) covers the full information security management system.
Do blockchain development companies follow open standards?
The best ones do. Vendors using proprietary credential formats create lock-in: your credentials only work with their infrastructure. Blockchain Click follows the W3C DID Core specification for decentralised identifiers and the W3C Verifiable Credentials Data Model 2.0 for credential schemas. This means your credentials can be verified by any W3C-compliant verifier, not just Blockchain Click's tooling. When evaluating a blockchain development company, request the credential schema in JSON-LD format and verify it validates against the W3C registry.
Are smart contracts audited before mainnet deployment?
At Blockchain Click, every production smart contract is audited by an independent external firm before deployment to any mainnet. This is a non-negotiable step in our build process, not an optional add-on. Our track record: 0 critical findings across all external audits to date. If a contract fails its first-pass audit, we remediate all critical and high findings at no additional charge. When assessing a blockchain development company, ask specifically which third-party audit firms they have used, whether reports are available and what their remediation process is.
What ongoing support does a blockchain development company provide?
Identity infrastructure requires ongoing maintenance: revocation schemas evolve, new chains emerge, regulatory requirements update and dependency upgrades introduce new security surfaces. Blockchain Click's sustain retainer provides a named engineer for post-launch credential schema updates, quarterly security reviews, chain upgrade monitoring and incident response. Growth plan clients get 90 days of included sustain; Enterprise clients have a permanent on-call retainer with 99.99% SLA. A generic support ticket queue is not sufficient for production credential infrastructure: confirm the sustain model includes engineering capacity, not just monitoring alerts.
Glossary
Core terms in decentralized identity, verifiable credentials and blockchain identity platform development.
Expand glossary (11 terms)
- Verifiable Credential (VC)
- A W3C-standard tamper-evident digital credential that proves a claim. The holder controls it in a wallet; a verifier checks a cryptographic proof without contacting the issuer.
- Decentralized Identifier (DID)
- A globally unique persistent identifier controlled by the subject, not a third party. Resolvable to a DID document containing public keys and service endpoints.
- Zero-knowledge proof
- A cryptographic protocol that lets one party (the prover) convince another (the verifier) that a statement is true without revealing any underlying information.
- Selective disclosure
- The ability to share a subset of claims from a credential without revealing the full document. Powered by zero-knowledge proofs or BBS+ signatures.
- Proof-of-personhood
- A credential that cryptographically attests a user is a unique human without revealing their identity. Stops bots, Sybil attacks and multi-accounting.
- Reusable KYC
- A one-time identity verification that produces a portable verifiable credential. Users present the same credential to any relying party without re-submitting documents.
- Issuer
- An entity (bank, government, platform) that creates and signs a verifiable credential and delivers it to the holder's wallet.
- Holder wallet
- A software application that stores, manages and presents verifiable credentials on behalf of a user. The user controls private keys; no issuer can revoke access to the wallet.
- Verifier
- A relying party that requests and cryptographically checks a verifiable presentation from a holder. The verifier does not need to store personal data to validate a claim.
- Revocation
- The mechanism by which an issuer invalidates a credential before its natural expiry. Implemented via on-chain revocation registries or status list credentials. On-chain revocation is one of the smart contract implementation services Blockchain Click delivers as part of every enterprise credential deployment.
- Blockchain identity platform
- A production system that issues, manages and verifies digital identities using distributed ledger infrastructure and cryptographic proofs. A blockchain identity platform replaces centralised identity stores with user-held verifiable credentials, removing PII from the application layer entirely.
Get in touch
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Satellite office: Berlin, Germany (research)
Editorial policy
All content on this site is authored by Blockchain Click's engineering and research team. Claims backed by production data require client sign-off before publication. Metrics are updated when a new deployment reaches 90 days of stable operation. Research notes undergo internal peer review by at least two engineers before release. Contact editorial@blockchain-development-company.click to report inaccuracies or request a correction. Last reviewed: 2026-06-15.
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This website does not use cookies, trackers or analytics. No personal data is collected when you browse this page. Contact form submissions at hello@blockchain-development-company.click are processed solely to respond to your inquiry and deleted after 90 days if no engagement begins. Your email address is never shared with third parties. To exercise GDPR rights (access, deletion, portability), contact privacy@blockchain-development-company.click. Data controller: Blockchain Click S.r.l., Via Toledo 256, 80132 Naples, Italy. Last reviewed: 2026-06-15.
Terms of service
Use of the Blockchain Click API and credential infrastructure is governed by the Master Service Agreement provided at contract signature. This website is for informational purposes only. No services are automatically activated by visiting this page or submitting a contact inquiry. Jurisdiction: Italian courts, Milan. Governing law: Italian law with EU regulatory overlay (GDPR, eIDAS 2.0). For enterprise contracts, contact hello@blockchain-development-company.click. Last reviewed: 2026-06-15.
Changelog
2026-06-15: Initial launch. ElevenLabs design system. Full credential infrastructure documentation, 88 production integrations listed, 3 case studies published.
2026-02-28: Research note BCK-2026-05 published.
2025-12-01: Naples FinTech and Identity Award 2025 received.
2025-09-14: ISO/IEC 27001:2022 certificate BCK-IS-2026-0391 issued by DNV.