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- Would It Be Technically Possible To Delete Old Blocks From A Blockchain . . .
From what I understand, a cryptocurrency mine needs to store a copy of the entire blockchain in order to be able verify transactions, which is why most wallet owners are not miners The more centra
- sha 256 - How to deal with collisions in Bitcoin addresses . . .
Well, I know that occurrences of such collisions will happen with a very low probability And, this is fine for me But, at least, I would have expected that, during the creation of a BTC address, one would check that the current address does not appear in the blockchain But, still, this is not enough as the creation should occurs in a decentralized manner, so two addresses in collision
- hash - Step-by-step conversion of Private Key in Hex to WIF (Wallet . . .
But private keys are generally only seen by your own wallet, and so every wallet can decide on a different way to present or store a private key E g I think the popular electrum wallet will only let you see your seed words, and won't even show you a hex representation of your private key
- Is it bad to expose the public key? - Cryptography Stack Exchange
Yes, hypothetical quantum computers usable for cryptanalysis would allow an adversary to attack a known public key of the kind we use now (and in the blockchain) On the other hand Currently, available quantum computers are less useful for cryptanalysis than available lightsabers are to break into a bank's safe room
- Using a blockchain for secure communication - Cryptography Stack Exchange
I've recently heard of the idea of using a blockchain for secure communication No details were given so it's a little hard for me to say that it can't be done But as far as I know: Secure communi
- dsa - Comparisons of ECDSA, EdDSA and BLS Signatures in Blockchain . . .
As we know, the most used digital scheme in Blockchain is ECDSA For now, more and more blockchain projects, I've noticed, are considering substituting EdDSA and BLS signature scheme as the new one
- hash - Finding the private key with the transaction signature . . .
"I have two ETH transactions (both belonging to the same address) that both have the same r value in the transaction signature, is it possible to extract the private key from it?" is directly about an on-topic cryptographic problem; but it's a duplicate The values of the hashes and signatures are off-topic, per policy on questions consisting mostly of ciphertext values
- Downsides of not using deterministic ECDSA signatures for blockchain . . .
I've noticed that in many Bitcoin wallet implementations, as well as other blockchains, deterministic ECDSA signatures are being used (generally based on RFC 6979) There seems to be some benefits
- Whats the purpose of key-rotation? - Cryptography Stack Exchange
Key rotation doesn't decrease the risk of keys being breached It mainly limits the amount of data encrypted under a certain key, so one may say it's done to so if a future key gets breached past comms are safe (r)
- Why hashing when generating account from public key?
I guess the OP is referring to PKH style BTC addresses, where hashing the pubkey is a way to avoid pubkey in UTXO (UTXOs can live on blockchain for long time before being spent: it should be impossible to get privkey from pubkey, but implementation bugs in wallet could make this easier than computationally stated) In a non-postquantum algos world could also give some sort of quantum attack
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