[
  12, / type code                                          /
  4,  / block number                                       /
  1,  / flags - block must be replicated in every fragment /
  0,  / CRC type                                           /
  h'8101020182028202018382014c5477656c766531323132313282020182040081
    81820150efa4b5ac0108e3816c5606479801bc04'
]