soliton's_Bitcoin#4

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Across
  1. 3. attack
  2. 4. mining protocol
  3. 7. cold storage protocol
  4. 8. next upgrade
  5. 9. sidechain
  6. 10. op_code
Down
  1. 1. 1st block
  2. 2. wallet
  3. 5. payment type
  4. 6. PBKDF2 modificator