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Questions tagged [validation]

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1 answer

Tangle : Algorithm to determine if a transaction is valid or not

A node needs to verify that all transaction that it receives are valid before adding it to its local copy of tangle. For this we would need an algorithm which given the cone of this transaction would ...
4 votes
2 answers

Fetch Encrypted Data ValueError: Request failed validation

I am trying to fetch bundles from the Tangle based on their tail transaction hashes. I am trying to follow step 7 of the Pyota Tutorial I successfully encrypted data and included it in a zero-value ...
0 votes
1 answer

Which feature/s will avoids SPAM or massive invalid transactions in a IOTA network?

Watching IOTA presentation there is a thing that is still unclear for me: Knowing that IOTA involves PoW but a much lighter one (in order to achieve thousands of transactions per second, but also ...
4 votes
1 answer

When is a transaction valid?

Which parts of a transaction need to have what value in order for it to be stored and broadcast by the IRI? I know that there are some bundle level conditions like valid signature sum of all values ...
4 votes
1 answer

How to verify a transactions sent by permanodes?

I don't have access to the old transactions anymore, so I have to trust (or permanodes in the future) that data from before the last snapshot is valid. How can I verify old transactions ...
3 votes
1 answer

How are nodes incentivised to be honest when approving transactions?

I am new to IOTA and would like to understand how nodes are incentivised to be truthful when approving transactions? Bitcoin: Say a miner approves a tx that is invalid (say bc it double spends). It ...
4 votes
1 answer

What does a node do if the two selected tips it has to validate are inconsistent?

Every article or blog post that I found only goes to the point where a node has selected two tips via the MCMC walk and checked them for consistency (and then states that if they are inconsistent the ...
2 votes
1 answer

How to validate bundle hash

I've been working with a C# port of the API and have managed to get messages posted to the tangle. As most of these are zero values I thought I'd try to help get them confirmed. When I ...
5 votes
2 answers

Why aren't timestamps validated?

So, I understand transactions are only validated syntactically, but I'm struggling to understand why that is the case? To be more specific, why isn't there an exactly once (and current timestamp > ...
8 votes
2 answers

How is ensured that a message sent in a transaction is immutable?

Zero value transactions can send a message instead of a signature, using the transactions signatureMessageFragment. However, as far as I understand the mechanism, only value, currentIndex, lastIndex, ...
6 votes
3 answers

How can I verify whether an address I've created offline is valid?

For security reasons I've created an IOTA address offline. Before I transfer into this address, how can I ensure this address is valid?
5 votes
1 answer

How does a full-node validate transactions?

A full-node "validates" the incoming transactions and discards invalid ones. What algorithms, mechanisms are involved in determining a valid transaction. Appending a transaction by doing the POW also ...