Questions tagged [proof-of-existence]
The proof-of-existence tag has no usage guidance.
7
questions
3
votes
1
answer
2k
views
Price of storing a hash SHA3 in Ethereum and Bitcoin
I'm involved in a Proof of Existence project and I need to know if it is convenient to create a private blockchain or we can use Bitcoin or Ethereum.
I would like to know the price of storing a SHA3 ...
- 2,733
3
votes
0
answers
473
views
Get proof that a transaction was included within a block
I see that the web3 api has the getProof method: https://web3js.readthedocs.io/en/1.0/web3-eth.html#getproof
My question is - is there a similar way to get (and verify) a proof that a transaction x ...
- 165
2
votes
2
answers
530
views
Can the modified Patricia Merkle Tree prove non-inclusion of a key-value pair?
i understand that Ethereum leverages modified Patricia Merkle Trees, and that they are capable of proving that a particular key-value pair exists within a tree.
i'd like to know if modified Patricia ...
- 33
2
votes
1
answer
87
views
Prove that an Event didn't happen in the Blockchain
I'm working on a Solidity token-vesting contract that allows users to claim tokens based on how long they met certain conditions.
To illustrate, let's assume holders of a specific NFT can claim 100 ...
- 121
1
vote
1
answer
835
views
How to search through blockchain?
I m doing project for document verification using blockchain in which we don't have to carry documents everywhere, hash key of block will fetch data of doc from blockchain.I m not getting how to ...
- 11
1
vote
0
answers
106
views
Building receipts proofs using only information from RPC
I tried to build a proof of inclusion for a particular receipt in a block, but I noticed that in some cases, the receipt was serialised together with the partial state root hash after executing this ...
- 111
0
votes
1
answer
429
views
Proof Of Existence (POE) input data first 8 numbers
I am trying to implement POE model based on Ethereum blockchain. Basically, I get sha-256 hash from a document, then I send a 0 ether transaction to myself and add document's hash to the "Data" field. ...
