answer the following short question

/in /by

  • Is it possible to modify the data once it is written in a block? can you discuss how you would be able to modify the data on a block?
  • How do you think testing can be carried out in a public blockchain where there is no restriction to the contributions?
  • What exactly is needed in understanding the security of a blockchain network?
  • How blockchain is different from the conventional system?
  • What is a cryptographic hash?
  • How ethereum is different from bitcoin?