Can a coinbase transaction contain only data: 03 - length and 030303 - coinbase itself, or should the coinbase itself contain the height of the block?
Add height as the first item in the coinbase transaction's scriptSig, and increase block version to 2. The format of the height is "serialized CScript" -- first byte is number of bytes in the number (will be 0x03 on main net for the next 150 or so years with 223-1 blocks), following bytes are little-endian representation of the number (including a sign bit). Height is the height of the mined block in the block chain, where the genesis block is height zero (0).
in this case, what should the part of the coinbase transaction look like now? example block 511824: ffffffff INDEX 55 LENGTH_COINBASE 0350cf0741d6a6ae79d8f62841d6a6ae79d8dba22f4254432e544f502ffabe6d6da64c1ef0a6cd6ffdecd9966246e336b366c8ba6ef07e9122485bb61b992bf61a8000000000000000fa00b68d1b3d000000000000 COINBASE (scriptsig) ffffffff SEQUENCE, where height block? Mar 10, 2018 at 15:06
O, yes, i understund: 03 - ??? what is??? 50cf07(hex little endian) == 511824(dec) Mar 10, 2018 at 15:10
okay, i'm little stupid) 03 - length height block and 50cf07 is height block, after 0350cf07 next may come the any text in the range of 100 bytes? what is the encoding that will be deciphered on the sites as a coinbase? I want to write there vbujym Mar 10, 2018 at 15:34