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Create blockchain certificates for all the events of your business processes.
In Ethereum. At scale.

Blockchain certificates

 A blockchain certificate is an irrefutable proof of the existence of a digital content stored in a blockchain network.

Only non-permissioned and secure public networks such as Ethereum can guarantee the immutability and data timestamping of data to anybody.



Wudder allows you to build blockchain traces through linked blockchain certificates. 

For each new event in a trace, a blockchain certificate is generated, referencing the initial event of the trace.


Our blockchain certificates offer the guarantees of the digital signature (authenticity, integrity and non-repudiation), but also guarantee the persistence and timestamping present in open and secure blockchain networks such as Ethereum. 

The events are not publicly available, but their cryptographic hashes. They cannot be recovered nor predicted from public data.

The Unquestionable Witness

A blockchain certificate guarantees the origin and integrity of the data in a specific moment in time.  You can prove the existence and authenticity of the certified data in an irrefutable way.

The certified data is not stored in any blockchain network, but an evidence of its existence (cryptographic hash).  Therefore, the original content cannot be recovered from the data stored in the blockchain network. 

The original data are not predictable since it is randomized prior to its certification through cryptographic techniques such as salting.

How our technology works

Thanks to our Layer 2 technology, we can offer a service for large volume generation of blockchain certificates with fixed costs in secure and open blockchain networks such as Ethereum.

In order for blockchain certificates to have all the expected guarantees (persistence, authenticity, non-repudiation, integrity and a trustworthy timestamp), the first-layer blockchain has to be public and widely trusted. If the blockchain certificates were generated in a private blockchain network, these properties would be only guaranteed for the network members.  Therefore, blockchain certificates issued on private networks have no greater guarantees than those stored in any traditional database.

On the other hand, permissioned public networks allow witnessing the evolution of the blockchain and, therefore, detect alterations or inaccuracies in the temporary sealing.  They are mainly based on trust in the entities that agree on the status of the blockchain although they can be audited.

Public networks not permissioned, such as Ethereum, are not based on the trust of a set of entities and cannot be altered at will.

Why use wudder?

The main drawback when creating massive blockchain certificates in public and non-permissioned blockchain networks is the small volume they support and the associated cost.  These restrictions limit in principle the use of networks such as Ethereum for the mass issuance of blockchain certificates.

Thanks to our second layer technology, blockchain certificates are instantly issued on a public blockchain that is attesting in real time.  After a brief period, blockchain certificates are grouped together and individual evidence of their presence in the Ethereum blockchain is generated.


Blockchain certificates are issued on  not permissioned public networks with consensus protocols that offer great security on the persistence and timing of data issuance.  In addition, it is impossible to recover certified content through it.

easy to use

No knowledge about blockchain is necessary and the service can be used through a web interface.

predictable cost

Unlike certificates issued on public blockchains directly, there is no volatility regarding the cost of issuing a certificate.  In addition, thanks to our second layer solution, this cost represents a fraction of the usual cost enabling massive use cases such as food traceability.

integration through api/sdk

It’s easy to make integrations through our HTTP API with our SDKs.


For each certificate issued it is possible to prove authorship and certified content separately.  In addition, the content can be modularized, so certain parts of it can be tested without revealing the rest with the same certificate.

Certified content will always be unpredictable no matter how simple it is thanks to cryptographic techniques such as salting, thus guaranteeing confidentiality.

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Contact us and discover how easy is to create blockchain certificates all the events of your business processes. Without obligation.

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Techno compliance and conformance desk