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I am having a tough time in understanding how Bitcoin payment verification works:

  1. How is Merkle tree related to Bitcoin blocks?
  2. Had Merkle tree not been there, what would have been the problem?
  • Sherlock, would you mind editing your question so that it only covers a single topic? (For example, editing your question so that it only contains 1 and 2.) It makes information easier to search for. Remember, it's totally fine to have multiple questions on the front page at once. – Nick ODell Oct 22 '14 at 21:28
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    Sure, I won't mind – Holmes.Sherlock Oct 22 '14 at 21:40