Questions tagged [proof-of-existence]

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17 votes
6 answers
7k views

Can I use Bitcoin to permanently prove that "there exists a file with content at this point of time"?

I have some files (e.g. of 10MB in size, think of it as a paper, an article, a photo, etc), and want to permanently prove that "at 2022.05.24, I already come up with such a file with such content&...
  • 271
1 vote
2 answers
364 views

Is OP_RETURN combined with a hash, appropriate for proof of existence of an asset?

I want to store a hash (of a tweet) in a way that is : Censorship proof Public Unchangeable Persistent Non centralized Less expensive as possible, obviously free if possible Technology offered by ...
  • 111
1 vote
1 answer
197 views

Why was the chain with the largest work chosen as the metric of consensus?

There seems to be a myriad of ways to find consensus (PoW, PoS, PoD, PoE and various other methods and hybrid approaches). What was the reasoning behind bitcoin being PoW and treating the chain with ...
8 votes
1 answer
426 views

Legal status of Blockchain proof-of-existence TX (USA court)

Is there any real USA court cases with Bitcoin's Blockchain used as an proof-of-existence/timestamp service (without BTC transfer)? Can Bitcoin's Blockchain be used as a 'signing' utility same as ...
7 votes
2 answers
3k views

What are the key differences between factom and tieron?

At a headline level, both Factom and Tieron appear to offer an identical service: ability to use the bitcoin blockchain to publish proofs of existence in a scalable way (i.e. by multiplexing multiple ...
  • 173
2 votes
1 answer
228 views

Is anyone using the blockchain (or other core Bitcome technology) for device registration?

I've been reading about several alternate uses for the underlying technology behind Bitcoin: Proof of Existence (digital notary) Namecoin (for DNS as well as identity and messaging) I was wondering ...
4 votes
2 answers
829 views

Does Proof of Existence lose bitcoins?

http://www.proofofexistence.com/about -- "Use our service to anonymously and securely store an online distributed proof of existence for any document." The document is certified via embedding its ...