Hi. I probably misunderstood something.
In your example #57 (first 200 bit + last 56 bit) =
0000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000011101011001001011100100100000111100101 011101011000011100
HEX: 00000000000000000000000000000000000000000000000000eb25c90795d61c => 1J9zB6p4dRgyinst2eCVsyXvgYXtNhw2Y2
This is not a private key for #57
What did I miss?
I forgot '1' at the beginning of the number:
last 56 bit of the private key#57:
1101011001001011100100100000111100101011101011000011100
but there are only 55 bits
Correct-->
last 56 bit of the private key#57:
11101011001001011100100100000111100101011101011000011100
0000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000011110101100100101110010010000011110010
1011101011000011100
HEX 0000000000000000000000000000000000000000000000000
1eb25c90795d61c