Questions tagged [data-validity]

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How to validate a transaction from any block in Blockchain

Given that we have a Blockchain with smart contracts. We have end users operating the platform for some time. Now one user wants to verify the claim of a transaction. Example, I have to prove that ...
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Is it possible for miner to tamper with the results when executing smart contracts?

When Miner A executes the smart contract, a result is generated and broadcast to the entire network. I want to know if this result may have been tampered with. If this is possible, how do other miners ...
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Detect orphant or uncle block

At a specificed time, I got a block from physical node with number 10074305 and it returned hash 0xdd30541695c4e574839d2356a01ff19e68c8c90c180b8955623c5e0b4b7e864a (#0), then after a period time, this ...
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Spending funds before the block is mined

Suppose I have an application that receives funds from users and instantly moves them into an associated cold storage account. If one of our nodes detects a transaction broadcast to one of our ...
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Why is NOT a protocol with a Turing-complete smart contract language able to use SNARKs to prove the validity of the chain?

In the following article (Link to the article: https://medium.com/nearprotocol/unsolved-problems-in-blockchain-sharding-2327d6517f43), the challenges of zk-SNARKs are mentioned as follows: The ...
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The “Fisherman” idea for indirectly determining the validity of the canonical chain?

The following article explains the problem of validating a block in a cross-shard transaction in a sharded chain, along with existing solutions. One of the mentioned solutions is the "Fisherman" idea ...