Switch to ArdorForum

It would be possible to include a new feature in the NRS that would be used as a notary? I am thinking in services like stampery, that uses the bitcoin blockchain to register the reality, ownership and integrity of any digital file (contract, photo, music...), so it works like a free notary and a free proporty register.
I imagine that using the arbitrary messaging it will be easy: the user should drop the file into the NRS, and it will generate a hash that will be writed permanently on the blockchain.
What do you think about it?

Yes, I think it would be great to have such a feature that would propose a standard way of doing it. Right now people can use AM, but this is unfortunally not a very formal and uniform way to register things on the blockchain.

This is a plugin job. There is already plenty of features in the core for notary stuff. The difficulty is now in the market side. Why and how the marlet is willing to use it?

I have been thinking about this for month, and find many ways to do the same thing.

What we may need are standard ways to treat various use cases.

You can sale a property with singleton assets but also with a private document notarized (public message hash) without the need of tagged data.

It depends what buying allows you to. How you want conflicts to be solved, or if they could be any.

Then there are all the use cases no one ever thought about since NXT or the new features did not exists before.


Envoyé de mon GT-I9195 en utilisant Tapatalk

You may want to play with my notary bot : https://notbot.me

It uses Nxt and Bitcoin. It is Free.
I pay for the Nxt transactions and the Bitcoin transactions : once per hour for Nxt and once per day for bitcoin.

From a blockchain perspective, it is better to notarize documents in groups like I do (merkel tree). It costs only one transaction for any number of document to notarize.

Once the transaction is confirmed, the site returns a certificate like that : https://notbot.me/certificate/207
you download, archive with your document and you are fine.
It is basically your document hash + blockchain transaction hash + merkel leaf (few hashes) and a formula to recompute the transaction hash from your document hash. This is enough to demonstrate, in the futur, the proof of existence of the document in the past.

Thank you I sent you a PM for details.

Thank you for this great service. I think it is a great idea that you do a dual Nxt-Bitcoin blockchain notary. Just a small typo you may want to amend:

"The NXT blockchain certify that..." change to "The NXT blockchain certifies that..." Same for the Bitcoin section

You may want to play with my notary bot : https://notbot.me

It uses Nxt and Bitcoin. It is Free.
I pay for the Nxt transactions and the Bitcoin transactions : once per hour for Nxt and once per day for bitcoin.

From a blockchain perspective, it is better to notarize documents in groups like I do (merkel tree). It costs only one transaction for any number of document to notarize.

Once the transaction is confirmed, the site returns a certificate like that : https://notbot.me/certificate/207
you download, archive with your document and you are fine.
It is basically your document hash + blockchain transaction hash + merkel leaf (few hashes) and a formula to recompute the transaction hash from your document hash. This is enough to demonstrate, in the futur, the proof of existence of the document in the past.

Thank you all for your enthusiasm. After all that time of lonely thinking, puzzling, coding, debuging.. I really appreciate

Its a fun project on which many things could be added and brings some surprises.

For instance, I had a good one when trying it with my android smartphone.

When I pressed the "Free Request Certificate" button, it gave me options..

Select file, but also: Take photo, Take video, Record voice 

And when I recorded my voice, the file was naturally saved locally, automatically hashed by the javascript of the website which result went straight in my set up and ended up in both blockchains ! The same with pic and videos : So you have direct records timestamps to the blockchains in only one click ! I dreamed to build an app for that (which I do not know how to yet). But I don't need to. 

Originally I wanted to create a Nxt account for each user and register their notary hashes with messages sent by me to their account, which would have created a registry for them available even if my service disappear. I could still list it in a friendly manner if they liked me. But I finally considered that it was not optimum and only too much "nxt-centric". 

It was not optimum because it needs one message per user batch, which requires the user to pay something. And having the list of hashes in one account, despite looking nice at a first glance, is useless because in every case, you must pay attention to the archive of your original document. Without it, the hash and the blockchain timestamp are useless.

So if the user has to pay attention to his archive, archiving along a certificate is not more work nor difficult. And if the certificate becomes a bit complex (merkel leafs and formula) who cares ? This switch of thinking turned out that in one transaction, an unlimited number of certificate also coming from different users, could be combined.. which then allows to offer the service for free.

Of course, I still have now to add some business model to it, I first thought at sponsoring to increase the frequency of the transactions (I don't know may be I still should), but, so far I've been more considering an optional offline archive service beside of it. Once your ability to recompute the hash of a document in a far futur has some legal consequences, it seems logical to me that you should invest "a bit" in reducing your probability to encounter a bad surprise in 10, 20, 30 years (and more) from now, because they are quite a number of "not so unlikely" threats.

"The NXT blockchain certify that..." change to "The NXT blockchain certifies that..." Same for the Bitcoin section

I corrected the typo, thank you very much.