I want to adopt cardano blockchain as a proof of existence and authenticity of documents on my job. How can I do that?

Making some research I found cardano CFC but I am not sure if is working already and if there are other alternatives at low or not cost.

2 Answers 2


You may check this project out https://cardanowall.com/en/

  • Can you expand on your answer rather than just including a link? The How to Answer page has great guidelines.
    – gRebel
    Jan 11 at 5:35

While this is possible to do in principle, there is currently a lack of standards surrounding many potential such applications of blockchain tech. Establishing standards will require us to experiment a bit at first, tailoring each application to our specific needs. That being said, I'd imagine there's a few ways of going about document verification, depending on what your requirements are for user-friendliness, security, and accessibility. Here are a few naive ideas:

  • One can hash some document(s) using a popular hashing algorithm like SHA-256, and post the resultant hash on chain as metadata. Here are some basic introductions for attaching metadata to a transaction. If someone would then like to verify the authenticity of the document, they could hash it themselves and compare their result with what is posted on chain (provided you give them the tx-hash of the transaction so they could query it). Note: while this method is secure and works well for individual documents, it can get tedious keeping track of everything if there are many documents posted over a long period of time. One can write a piece of software that automates this process or:
  • One can securely generate a GPG keypair, whose fingerprint they post on-chain as metadata. Now, anything signed by the keys can be referenced by an external validator as being the same signatory whose key fingerprint is stored on chain. This method requires a higher level of trust in that the validator assumes your keys have not been compromised, but it is much easier to authenticate many documents since only your GPG fingerprint is stored on chain.

As far as paying for all of this goes, fees on cardano are deterministic, and it relatively cheap to submit basic transactions with metadata. Here is the formula for reference.

These are just a few spitballs of how I would begin going about solving your problem. However, I'm sure that, as time goes on, standards will evolve and cement themselves for such applications.

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