[Description] This is the offset of the block within the fractal heap's address space (in bytes). The number of bytes used to encode this field is the Maximum Heap Size (in the heap's header) divided by 8 and rounded up to the next highest integer, for values that aren't a multiple of 8. This value is principally used for file integrity checking. [Field Name] 
Block Offset
S i g n a t u r e
V e r s i o n
H e a p H e a d e r A d d r e s s
B l o c k O f f s e t
C h i l d D i r e c t B l o c k # K A d d r e s s
S i z e o f F i l t e r e d D i r e c t B l o c k # K
F i l t e r M a s k f o r D i r e c t B l o c k # K
C h i l d I n d i r e c t B l o c k # N A d d r e s s
C h e c k s u m