1

Other than the previous block hash and nonce data, which elements of a block are concatenated in order to be hashed?

4

The whole block header is hashed including:

  1. Block version number
  2. 256-bit hash of the previous block header
  3. 256-bit hash based on all of the transactions in the block (hashMerkleRoot)
  4. the current timestamp as seconds since 1970-01-01T00:00 UTC
  5. Bits (updated when he difficulty is adjusted)
  6. Nonce

https://en.bitcoin.it/wiki/Block_hashing_algorithm

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