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diff --git a/sem7/dist/opgblock.md b/sem7/dist/opgblock.md new file mode 100644 index 0000000..39b8889 --- /dev/null +++ b/sem7/dist/opgblock.md @@ -0,0 +1,23 @@ +# Questions + +> What can be said about privacy and confidentiality in blockchains? Which kind of identity privacy can be kept? Can data be kept confidential, and how? + +Because transactions are stored immutably in the blockchain, it is possible to see all previous interactions for a specific public key. +If i where to use the same key for everything, that would not give me much privacy as my friends would probably also know that identity. + +If i want to keep my transactions private, i would have to make new identities for each purpose. +This would require alot of managing of resources, as each identity has it's own wallet. + + +> Is it possible to remove all the "transaction data" of a block from the disk, and keep only the Merkle tree head? In which cases? + +Yes it is possible, especially if all the money contained in it is spent. +Because the hash of the block only covers the Merkle tree head, one can remove the rest from disk. + +However this is stupid if one want's to keep historical data of transactions. + +> Why is the miner protected from a "while(true) {...}" Denial of Service attach in Ethereum / Solidity? + +The program can't run forever before reaching the computation limit, which i think is galled gas. +That way a while loop would quickly run out of gas, and the execution will stop. +In that way it is only the owner of the contract who wastes their money. |