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I am working on blk file parser and there is problem with one of coinbase tx.

hex:

00000000: 0b11 0907 cf44 0e00 0000 0020 7f00 6e33  .....D..... ..n3
00000010: 4287 2eb8 c047 5d7c 16de 070e 5d88 1958  B....G]|....]..X
00000020: 91c2 6460 7104 0000 0000 0000 bef7 a5e4  ..d`q...........
00000030: 017b 7455 9f92 e883 d556 e21f ce14 aeb7  .{tU.....V......
00000040: 88c9 b2e2 ffec 2c6f 4b14 a901 0cb5 1358  ......,oK......X
00000050: cc2c 051a e9b8 2286 fdaf 0201 0000 0000  .,....".........
00000060: 0101 0000 0000 0000 0000 0000 0000 0000  ................
00000070: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000080: 0000 ffff ffff 3603 7e76 0f00 040c b513  ......6.~v......
00000090: 5804 b761 0630 0ce8 3a09 58c5 f700 0000  X..a.0..:.X.....
000000a0: 0000 000a 636b 706f 6f6c 122f 4e69 6e6a  ....ckpool./Ninj
000000b0: 6150 6f6f 6c2f 5345 4757 4954 2fff ffff  aPool/SEGWIT/...
000000c0: ff02 0e2a d213 0000 0000 1976 a914 876f  ...*.......v...o

Let's decode it according to bitcoin developer reference specification.

0b11 0907 - testnet3 magic number
cf44 0e00 - block size

Block header begins:
0000 0020 - block version
7f00 6e33 4287 2eb8 c047 5d7c 16de 070e 5d88 1958 91c2 6460 7104 0000 0000 0000 - previous block hash
bef7 a5e4 017b 7455 9f92 e883 d556 e21f ce14 aeb7 88c9 b2e2 ffec 2c6f 4b14 a901 - merkle root hash
0cb5 1358 - time
cc2c 051a - bits
e9b8 2286 - nonce
Block header ends;

fdaf 02 - transactions in block

And now the problem:
01 0000 00 - transaction version
00 - inputs counter
0101 - 2 unknown bytes.

I didn't found any information about this 2 unknown bytes. Any help appreciated.

  • this block is valid. blk file from bitcoin-core client – axvm Nov 20 '16 at 10:56
3

I found the answer. This 'unknown bytes' described in bip144

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