“One of the pioneering firms in web3 solutions, digital assets and tokenization, recognized for its innovation and solid reputation across Spain and Latin America.”
Jorge CorredorLawyer, Rincón Cuéllar & Asociados
We are your blockchain development company in France
We build blockchain products for companies in France with our in-house team, designing each project around MiCA, the split between the AMF and the ACPR, and the French rules that allow securities to be recorded on distributed ledgers.
Tell us about your project
Blockchain development in France, from idea to production
We turn your use case into a product that can be launched, operated and extended. A single team designs the architecture, writes the contracts and integrates them with your systems.
Tell us what you want to buildThe French framework, from the architecture
We tell a MiCA crypto-asset apart from a security recorded on a distributed ledger, because the supervisor and the permission change. The AMF authorises PSCA providers and the ACPR covers ART and EMT issuers and payment services.
Smart contracts ready for review
We build your business logic with tests and peer review, and prepare the code for an external audit and a staged deployment before it reaches production.
In English, within your working day
You work in English, or in Spanish if your team prefers, with the people who design and write the code. Meetings go in your working hours, and the rest moves forward through shared documentation and a stable technical channel.
A foundation that keeps evolving
We document the code and plan deployments and monitoring, so your team can maintain the product and add features on a foundation it understands.
Services
Blockchain development services in France
We cover the full Web3 product lifecycle, from idea and MVP to mainnet, audits and maintenance.
Connect your operations
Represent assets and rights
Use cases
Blockchain use cases in France
Cases that build on rules France already applies, from champagne's minimum time on its lees to the number on every energy performance diagnosis.
Distributed ledger securities
Since the December 2017 ordinance, France has allowed certain securities to be recorded on a distributed ledger, with authentication safeguards at least equivalent to a securities account.
Blockchain for Banking & Finance
Champagne ageing
Champagne rests on its lees for at least 15 months after the second fermentation, with bottling from 1 January after the harvest; the record follows each lot from tirage to disgorgement.
Blockchain for Agribusiness
Unsold fashion stock
The AGEC law bans disposing of unsold non-food goods by incineration or landfill: they must be reused first, or else recycled; the record shows where each lot ends up.
Blockchain for Fashion & Luxury
Home energy diagnosis
Every DPE carries an ADEME identification number, without which it is not valid, and since 2025 a home rated G cannot be let; the record keeps the property's energy history.
Blockchain for Real Estate
Technologies we build blockchain with in France
Our stack covers every layer of your product: smart contracts, blockchain networks and integration with your systems. It is what we use to build, test and deploy software tailored to your business.
- Solidity
The smart contract language for verifiable rules on EVM networks.
- Rust
Performance and memory safety for contracts, nodes and Web3 tooling.
- Ethereum
EVM contracts, tokens and final settlement on an open Proof of Stake network.
- Hardhat
An environment to compile, test and deploy contracts on EVM networks from Node.
- Foundry
Solidity tests, invariant fuzzing and command-line tooling for EVM networks.
- Chainlink
Oracles for external data, randomness and cross-chain messaging for contracts.
- Polygon
Polygon PoS: EVM contracts secured by its own validators, with low fees.
- Solana
Programs, accounts and parallel execution on a high-throughput layer 1.
- OpenZeppelin
Audited Solidity contracts for tokens, access control and upgradeable systems.
European Union: MiCA / AMF · ACPR
Blockchain regulatory framework in France
In France, MiCA applies directly: the AMF authorises and supervises crypto-asset service providers (PSCA, the MiCA CASP) and the ACPR covers ART and EMT issuers and services that amount to payments. The former PSAN registration stopped being sufficient on 1 July 2026. For tokenized securities, Article L.211-3 of the Monetary and Financial Code allows them, in the cases set by law, to be recorded on a distributed ledger instead of a securities account.
See blockchain regulation in FranceFrench framework
Milestones enabling blockchain in France
The dates that set how securities are recorded on distributed ledgers and how a crypto-asset provider is authorised in France today. Each milestone links to its source.
See the regulation guide for FrancePublication of the shared ledger ordinance
The Official Journal publishes Ordinance 2017-1674 of 8 December on representing and transferring certain securities through shared ledgers. Publication is distinct from subsequent application.
Légifrance · Original publicationGeneral MiCA application and financial code amendments
General application of the regulation and the cited Article L.211-3 amendments on distributed ledgers begins.
MiCA · Article 149First AMF MiCA authorization: Deblock
The official register dates Deblock’s A2025-001 permission to 23 May. The following week, the AMF confirms its first authorization, distinct from the former PSAN registration.
AMF · Deblock registerPublication of approval of Lise’s rules
The AMF publishes its decision of 13 October approving the rules of Lise’s DLT multilateral trading facility, which also operates a settlement system under the pilot regime. This infrastructure milestone is distinct from crypto-asset service provider authorization.
AMF · Lise rulesEnd of the PSAN transitional regime
The former national entitlement ceases to be sufficient for continuing services subject to MiCA.
AMF · End of transition
Reviews in France
What do our clients think of Metlabs?
“We structured the tokenization of real estate projects with them, and I value the team's ability to understand our corporate needs and genuinely solve them.”
Joan MejíaManager, GLOBYNE
“They advised us on the feasibility of tokenizing real estate assets in Uruguay with direct, cordial treatment. A professional team, responsive and always available.”
Álvaro Silva SantamaríaCEO, Sp Inmuebles
“Great professionals at structuring tokenized projects, with technical command and attention to detail that inspire full confidence at every stage of the work.”
Francisco BetancourtVerified Google review
“As a blockchain lawyer, I value their experience and professionalism in consulting and executing tokenization projects. Technology partners you can fully trust.”
Vanessa RivasBlockchain lawyer, El Salvador
“Great professionals, very attentive to their clients and always mindful of every detail. Working with their team has been a genuine pleasure from start to finish.”
CriptorentVerified Google review
“A very professional yet approachable company that empathizes with your doubts and needs. Highly recommended for entrepreneurs with a tokenization project.”
Javier EspasaTokenization entrepreneur
“Exceptional in every sense. From legal support I value their rigor and transparency: working with Metlabs means professionalism, innovation and security.”
Pedro A. Agúndez MéndezGoogle Local Guide
“Excellent service across blockchain development, asset tokenization and consulting. A very professional team that I recommend wholeheartedly, without reservation.”
José Luis DíazVerified Google review
“I have worked with them on several projects and they are very professional. A guarantee that everything turns out perfectly. Without a doubt, 100% recommended.”
Ignacio Fernández JiménezVerified Google review
“One of the pioneering firms in web3 solutions, digital assets and tokenization, recognized for its innovation and solid reputation across Spain and Latin America.”
Jorge CorredorLawyer, Rincón Cuéllar & Asociados
“Great professionals at structuring tokenized projects, with technical command and attention to detail that inspire full confidence at every stage of the work.”
Francisco BetancourtVerified Google review
“A very professional yet approachable company that empathizes with your doubts and needs. Highly recommended for entrepreneurs with a tokenization project.”
Javier EspasaTokenization entrepreneur
“I have worked with them on several projects and they are very professional. A guarantee that everything turns out perfectly. Without a doubt, 100% recommended.”
Ignacio Fernández JiménezVerified Google review
“We structured the tokenization of real estate projects with them, and I value the team's ability to understand our corporate needs and genuinely solve them.”
Joan MejíaManager, GLOBYNE
“As a blockchain lawyer, I value their experience and professionalism in consulting and executing tokenization projects. Technology partners you can fully trust.”
Vanessa RivasBlockchain lawyer, El Salvador
“Exceptional in every sense. From legal support I value their rigor and transparency: working with Metlabs means professionalism, innovation and security.”
Pedro A. Agúndez MéndezGoogle Local Guide
“They advised us on the feasibility of tokenizing real estate assets in Uruguay with direct, cordial treatment. A professional team, responsive and always available.”
Álvaro Silva SantamaríaCEO, Sp Inmuebles
“Great professionals, very attentive to their clients and always mindful of every detail. Working with their team has been a genuine pleasure from start to finish.”
CriptorentVerified Google review
“Excellent service across blockchain development, asset tokenization and consulting. A very professional team that I recommend wholeheartedly, without reservation.”
José Luis DíazVerified Google review
Security
Security in blockchain development in France
Every delivery goes through the same checklist before it reaches mainnet. What changes between projects is the depth of each control, because an MVP does not carry the same risk as a contract that holds third-party funds.
Before mainnet
- Roles and permissions defined for every critical function
- Unit and invariant tests, and fuzzing on the logic that moves value
- Static analysis and peer review of every change
- Multisig and timelock on administration when the risk justifies it
- Custody and rotation of the deployment keys agreed
- External audit when the value at risk requires it
We work with leading audit firms
FAQ
Frequently asked questions about blockchain development in France
What we are asked before a project starts.
Talk to our teamWhich regulations apply to a blockchain project in France?
MiCA governs crypto-asset issuance and services: the AMF grants PSCA authorisation and certain financial entities can use the Article 60 notification, while ART and EMT issuers follow ACPR procedures. If the token is a financial instrument, it is assessed under the Monetary and Financial Code and, where relevant, the DLT Pilot Regime. AML obligations also apply. We analyse the fit of your case before writing any code.
Do you work with both startups and established companies?
Yes. We support startups from MVP validation to a product they can show in a funding round, and established companies on tokenization, traceability and digital identity projects with strict compliance requirements. In every case, smart contracts go through tests and review before they reach mainnet.
How do you work with French companies?
In English or Spanish, in direct contact with the people who design and build the product. We schedule meetings within your team's working day. Shared documentation, written decisions and a stable technical channel keep the work moving.
How long does blockchain development take?
The timeline depends on product complexity, integrations and the level of review required. Before development we define the scope, dependencies and deliverables of each phase, so you can decide what reaches production first and what waits for a second iteration. That way an MVP is never mistaken for a complete architecture.
Which blockchain network is right for my project?
We do not choose the network by trend. For EVM projects we assess Ethereum, Polygon, Arbitrum or Base on finality, costs, tooling, interoperability, custody and compliance, and we consider non-EVM networks when they fit better. The recommendation covers contracts, indexing, wallets and operations, and comes from the product requirements and who will use it.
Let's build the rails for your project in France
Tell us about your case and we'll propose architecture, timeline and budget within a week.
Where we work in France
We work remotely with teams throughout the country, and on site where the project calls for it.
Territorial coverage
- Auvergne-Rhône-Alpes
- Bourgogne-Franche-Comté
- Brittany
- Centre-Val de Loire
- Corsica
- Grand Est
- Hauts-de-France
- Île-de-France
- Normandy
- Nouvelle-Aquitaine
- Occitania
- Pays de la Loire
- Provence-Alpes-Côte d'Azur
- Guadeloupe
- French Guiana
- Martinique
- Mayotte
- Réunion
Blog
Articles on regulation and tokenization
MiFID II and tokenization: classification, services and limits
MiFID II and tokens: financial instrument classification, investment services and the distinction from MiCA before designing an issuance.
What are the differences between security tokens and utility tokens?
How to distinguish financial rights from service access, what legal classification examines and why a token’s name does not determine its regulation.
Blockchain in real estate: documents, payments and milestones
How blockchain can coordinate documents, payment approvals and construction milestones, and what to test before using it in a real estate transaction.
Where we are
Blockchain development in France and worldwide
Metlabs Offices
Av. García Sabell, 1, Edificio Proa 15009 A Coruña, Spain
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