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slaveforanunnak1
Very nice, thank you for the link!
redsn0w
When I learn to mess with OP_RETURN, I'll give that a try. Beginner here, NONE of my friends are into any of this.
Topic: Using the blockchain to post permanent documents. A contest! (Read 2010 times)
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Comments on my doc are welcome here on this thread. I just started it, it is meant for BEGINNERS (like me).
I already do understand that putting up a link to a document that can later change is not worth much.
(this post edited)
Comments on my doc are welcome here on this thread. I just started it, it is meant for BEGINNERS (like me).
I already do understand that putting up a link to a document that can later change is not worth much.
(this post edited)
You should put a link of a pastebin as op_return, the hash of a file works only if that file will be not modified (again).
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Continuing my education, I sent a link to a Google doc as a "Public Note" at the below blockchain transaction:
4b1cd9f9e68a348eba331c9458ed59f59464ff993a0262905ef643439c153bb9 (probably at block 344274)
The message:
http://goo.gl/k7zxjp
* * *
blockchain.info shows the "Public Note".
Do other tools show that as well?
* * *
Comments on my doc are welcome here on this thread. I just started it, it is meant for BEGINNERS (like me).
I already do understand that putting up a link to a document that can later change is not worth much.
(this post edited)
Continuing my education, I sent a link to a Google doc as a "Public Note" at the below blockchain transaction:
4b1cd9f9e68a348eba331c9458ed59f59464ff993a0262905ef643439c153bb9 (probably at block 344274)
The message:
http://goo.gl/k7zxjp
* * *
blockchain.info shows the "Public Note".
Do other tools show that as well?
* * *
Comments on my doc are welcome here on this thread. I just started it, it is meant for BEGINNERS (like me).
I already do understand that putting up a link to a document that can later change is not worth much.
(this post edited)
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odolvlobo
Both of your comments are correct.
I should have written my comment better (that they post the HASH, not the document itself), good eye, thank you for the correction.
odolvlobo
Both of your comments are correct.
I should have written my comment better (that they post the HASH, not the document itself), good eye, thank you for the correction.
The other day I ran into proofofexistence.com. They have a service which will allow almost anyone to do something like that: post documents on the blockchain.
They don't post the document in the block chain. They post a hash of the block chain. That way if someone asks you to prove that the document existed before a certain date, you can show them the timestamped hash in the block chain.
Quote from: http://proofofexistence.com/about
What is proof of existence?
Use our service to anonymously and securely store an online distributed proof of existence for any document. Your documents are NOT stored in our database or in the bitcoin blockchain, so you don't have to worry about your data being accessed by others.
Use our service to anonymously and securely store an online distributed proof of existence for any document. Your documents are NOT stored in our database or in the bitcoin blockchain, so you don't have to worry about your data being accessed by others.
There is no way to determine the original document just from the hash.
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But, how do I know it's not a scam? That way I am only out BTC0.05...
LOL
But, how do I know it's not a scam? That way I am only out BTC0.05...
LOL
Considering that SHA256 is virtually unbreakable, I find BTC0.05 to be very low for a reward.
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About a year ago, I read that the the blockchain can be used to store documents. Even corporate founding documents (I believe that a company has already been formed on the blockchain). More recently (at TNABC) I ran into a company called factom.org, they want to write for developers that would put permanent & un-alterable documents on the blockchain. factom wants to do that by using "hash values" of such documents.
The other day I ran into proofofexistence.com. They have a service which will allow almost anyone to do something like that: post documents on the blockchain. I did that just today. It costs about $1.25 (in BTC) to do that. I had a little bit of trouble figuring it out, but eventually I did. Here is "their" version of my message after their SHA-256 hashing of my document:
09c388c5e1ef405751fb5dccb0767ed5f77f5f7f209def56ccae6433a111761b *
The above was posted onto the blockchain (block number 344121). The transaction (hash) number on the blockchain for this is:
cc890677133beb1edefff00bab4266da12eb2a5b675907233012f7ef1721d7ee
A contest (for anyone who would like to take a shot this). If you can tell me what my original message was (from the first hash-value above, in green), I will pay a prize of 0.05 BTC, but you must be the FIRST one to claim the prize, HERE, and you must explain HERE how you solved it.
Good luck!
* * *
For the purists around here, I will make a donation to the Bitcoin Foundation (as I believe that they are coordinating the developers working on new versions of BTC software).
"Blockchain Bloat" appears to be a (future) problem that they will solve, so I would like to do my part.
* EDIT:
In case you DO solve it, please leave out my real name, thanks! Otherwise, post the message in this thread.
About a year ago, I read that the the blockchain can be used to store documents. Even corporate founding documents (I believe that a company has already been formed on the blockchain). More recently (at TNABC) I ran into a company called factom.org, they want to write for developers that would put permanent & un-alterable documents on the blockchain. factom wants to do that by using "hash values" of such documents.
The other day I ran into proofofexistence.com. They have a service which will allow almost anyone to do something like that: post documents on the blockchain. I did that just today. It costs about $1.25 (in BTC) to do that. I had a little bit of trouble figuring it out, but eventually I did. Here is "their" version of my message after their SHA-256 hashing of my document:
09c388c5e1ef405751fb5dccb0767ed5f77f5f7f209def56ccae6433a111761b *
The above was posted onto the blockchain (block number 344121). The transaction (hash) number on the blockchain for this is:
cc890677133beb1edefff00bab4266da12eb2a5b675907233012f7ef1721d7ee
A contest (for anyone who would like to take a shot this). If you can tell me what my original message was (from the first hash-value above, in green), I will pay a prize of 0.05 BTC, but you must be the FIRST one to claim the prize, HERE, and you must explain HERE how you solved it.
Good luck!
* * *
For the purists around here, I will make a donation to the Bitcoin Foundation (as I believe that they are coordinating the developers working on new versions of BTC software).
"Blockchain Bloat" appears to be a (future) problem that they will solve, so I would like to do my part.
* EDIT:
In case you DO solve it, please leave out my real name, thanks! Otherwise, post the message in this thread.
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