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Do digital signatures still get stored after validating a transaction for a blockchain ?

I would assume it gets dumped after validation and only the message/data is stored.

Additional info on this scenario:

  • Private blockchain (PoA consensus)
  • More signature size heavy PQC digital signature algorithms (2500 to 4000 Bytes per signature)
  • Recording sensor data
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  • I believe digital signatures are typically stored as part of the transaction data even after the transaction has been validated. But don’t quote me on that. Commented Jul 4 at 6:10

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Surprisingly enough, there is actually a fair amount of decent information on the web on blockchain systems. But for exact answers it took a lot of research.

To answer your question, digital signatures are for transaction integrity and authenticity, and they are stored as part of the transaction data on the blockchain- typically. I say typically because this probably isn’t always the case.

The Binance Academy explains that in the Bitcoin blockchain, as am example,

the Elliptic Curve Digital Signature Algorithm is used to authenticate transactions,

ensuring that

only the rightful owner of the cryptocurrency can authorize its transfer.

I assume this permanent storage allows for independent verification of the transaction validity- making sure the blockchain keeps its integrity.

even in private blockchains using Proof of authority consensus, storing digital signatures is used for ensuring that recorded information, such as sensor data for example, remains verifiable and tamper-proof.

And despite the larger size of post-quantum cryptographic m digital signatures, which can range from 2500 to 4000 bytes, it’s clear that they are necessary for maintaining security.

101 Blockchains states that digital signatures

are capable of offering better security with reduced possibility of identity theft or impersonation,

and they are vital for

proving that the message could originate from a particular source.

I hope this answers your question- and again, conclusively, most of the time (but not all,) blockchains do store signatures to, in short, stop replication.

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