UNDERCOVERLAB
Digital signature · blockchain
Tsubasign
Digital signing where blockchain guarantees the immutability of signatures: nobody can tamper with them afterwards. Our product, not a demo.
Service
Block
chain.
Nine times out of ten, when someone sells you blockchain, you don't need it. We tell you when you're in the other ten percent, and then we build it for real. No hype, no smoke, no free token.
The problem
Blockchain has been oversold
until it means nothing
For years, "blockchain" was the word slapped in front of anything to make it look like the future. Most of those projects needed blockchain for nothing: a normal database did the same job, cheaper and faster.
All that noise leaves you with a fair question: does my case genuinely need it, or is it just another fad someone wants to sell me?
Almost always the answer is "no". But when it's "yes", it makes all the difference.
How we do it
We tell you what others won't: when you DON'T need it.
Anyone who makes a living selling blockchain will never tell you that you don't need it. We will, because it isn't our living: it's one more tool in the box, not our business.
Blockchain only makes sense for something very specific: a record that can't be altered, that nobody (not even you) can falsify afterwards, or several parties who don't trust each other sharing the same truth without a middleman. If that's your case, then yes.
What we build
Blockchain development
for businesses.
01
Verification and authentication
Proving that something is what it claims to be, with no way to fake it. Documents, identities, certificates. This is where tamper-proofing genuinely pays off.
verification · eIDAS 202
Digital signatures and traceability
Records that can't be tampered with after the fact, with proof of when and who. Useful when trust has to sit in the system, not in someone's word.
signature · traceability03
Crypto payment integration
When your business genuinely needs it, we add it where and how it makes sense, without turning it into the centre of anything.
payments04
Diagnosis before building
The most valuable service: we tell you whether your case needs blockchain or not. Often the answer saves you an entire project.
judgementThe question everyone asks
When does a business actually
need blockchain?
Rarely, and it's worth knowing before you spend anything. Blockchain delivers real value in three situations only: when you need a record nobody can alter afterwards (certificates, traceability), when several parties who don't trust one another must share the same information without a trusted middleman, or when proof of authenticity has to be verifiable by anyone without depending on you.
If your case is none of those three, a conventional database is cheaper, faster and easier to maintain. That's why we always recommend a diagnosis before building: blockchain misapplied is expensive and slow with no upside. Applied well, it solves things nothing else does.
We don't talk about it, we've built it
Real blockchain.
In production.
Unlike most, we don't sell you blockchain with a PDF of promises. We have our own product, up and running, built on real blockchain.
Verification · eIDAS 2
ResidenceSafe
Residence verification on blockchain, with eIDAS 2 validity. Proof of days of residence that stands up to a tax inspection. Built, published and in use.
It's not "we know a thing or two": it's that we use it where we believe in it, on our own products. The best proof that we know when it's worth it is that we've used it for ourselves.
Before you ask
What everyone wants to know.
Do I actually need blockchain or is it just hype?
Most projects don't need it, and we'll tell you straight. Blockchain makes sense when you need proof that nobody can alter later: a certification, a signature, a record that has to stand up to an audit. If a normal database solves what you need, we'll recommend that and spare you the complexity.
Have you done real blockchain projects, or is it just theory?
We have our own product in production built on real blockchain. ResidenceSafe seals proof-of-presence certifications with eIDAS 2 validity, and Tsubacheck and Tsubasign handle identity verification and signing on the same foundation. Not a demo: published apps that work every day.
Do I have to use cryptocurrencies or tokens?
No. Blockchain as a record-keeping and certification technology involves no crypto or tokens. What we bring is the tamper-proof record, not the speculation. If your case genuinely needs digital assets, we cover that too, but we never bolt it on when there's no need.
What is eIDAS 2 validity?
eIDAS 2 is the European regulation that gives legal value to electronic identities and signatures. A certification with eIDAS 2 validity isn't just any seal: it carries legal recognition across the EU, and that's what makes it useful before a public authority or a court.
How much does a blockchain project cost?
It depends on the scope: what needs sealing, what volume and how it integrates with what you already have. We don't quote off a price list. The first conversation is free and, if we see your case doesn't need blockchain, we'll tell you before charging you anything.
Do you work with companies outside Andorra?
Yes. We're from Andorra and we know the ground, but we work with clients in Monaco, Belgium and beyond. Good judgement travels.
Got a case that needs proof that holds up?
Tell us about it. We'll look at whether blockchain genuinely adds value, how to do it and what it would cost. You leave with a clear idea of the next step, no strings attached.
Let's talk about your project → or reach out however suits you best