Breakdown of Bitcoin transaction

https://blockchain.info/tx/60b20eca2285b7ed8b64a1f98277c16fcc205b9e21413d6a72545880d2a3f341?show_adv=true

or to view hex:

https://blockchain.info/tx/60b20eca2285b7ed8b64a1f98277c16fcc205b9e21413d6a72545880d2a3f341?format=hex

Full original broadcast tx:

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

Tx ID:  60b20eca2285b7ed8b64a1f98277c16fcc205b9e21413d6a72545880d2a3f341
Tx ID created by byte_reverse(double_sha256(fullsignedtx))


Breakdown of tx:

01000000  -  byte_reverse(Version: 1, in hex, 4 bytes long)
02  -  Total number of inputs (starts at 1, not 0, so for this tx there are 2 total inputs not three)
17cbf067a9ad71b2f69ea66a1c94d04cee26f856b5b4bdccaeccb59761419668  -  byte_reverse(input_txid)
01000000  -  byte_reverse of vout num for prev_tx (starting at 0, so this is the second output from that tx)
8a  -  total byte length (in hex, 0x8a = 138) of following signature + pubkey, (plus prefix bytes to indicate length)
47  -  total byte length (0x47 = 71) of following signature
30  -  DER encoded signature
44  -  total byte length of following signature info
02  -  first value is an integer, represented in hex (DER format calls that 0x02 apparently)
20  -  byte length of first value (0x20 = 32 in decimal)
735364aea32db724e7f0179f48e4ad5a63a3b04f733e82ca5215097a91aa7123  -  r value (pub X coord of random nonce)
02  -  next number is also an int
20  -  next data is 32 bytes long
15846041c9564ff96fb269cb5e9b2f24dac003299e5d16d34fb9c699d55825c7  -  s value (signature for nonce,data,privkey tuple)
01  -  bitcoin signature type SIGHASH_ALL
       (tells miners how to verify signature.  some sig types sign only certain inputs or outputs, like in coinjoin tx's.  the standard SIGHASH_ALL signs your input and all outputs so no modifications can be made)
41  -  byte length of following public key (0x41=65)
04617f9e26b7f6f776e30cb4aa24ebef9e183caf6da25684862a32446589be20a53c2b37a7283430033bdfd2f31a96edaea88bf9ebf07498476cb34d16b47887ed  -  pubkey which is the key for the input address and which corresponds to the privkey used to make sig
ffffffff  -  sequence number, assigned just now in this tx, to this last input, for use with nlocktime in this tx
877a5dd62eab9f1fd28739a9ae7c68fcb0f075b2c2ede13cb3acff15d362e271  -  second input byte_reverse(tx_id)
01000000  -  second input byte_reversed vout number.  (again, starting at 0, so this is the second output)
8c  -  length of full signature and pubkey
49  -  length of following signature info
30  -  DER encoded signature
46  -  length of following signature info
02  -  first number is der int
21  -  length of first number data plus 00 prefix
00  -  DER prefixes integer with 00 if integer begins with 0x80 or higher.
d0af9e17b678ad7823ad331a04d5b50f2dc173715949718ef974314f9ddbf0fa  -  r value
02  -  next number is int
21  -  length of next number and 00 prefix
00  -  prefix, since next number starts at 0x80 or higher
98de23b9c6daad57e7c8a8748718c56ec8d20cd2686aa652c4fb85091a39c690  -  s value
01  -  SIGHASH_ALL
41  -  length of following pubkey
04617f9e26b7f6f776e30cb4aa24ebef9e183caf6da25684862a32446589be20a53c2b37a7283430033bdfd2f31a96edaea88bf9ebf07498476cb34d16b47887ed  -  pubkey for prevtx vout, which should be the same one used for the signature
ffffffff  -  sequence number assigned to input
01  -  total number of outputs, in hex, starting at 1 not 0.
709cc90100000000  -  byte_reverse of (number of satoshis in output represented in hex), zfilled to 8 bytes long
19  -  number of bytes for output script
76  -  OP_DUP, duplicated previous stack data (which will be the hash160 when this script is used to spend the money)
a9  -  OP_HASH160, the ripemd160(sha250(pubkey)) for the output key
14  -  length of the hash160 data
ea0fcd06c9c62e590a8975627d0165b514568a5a  -  hash160 of address's public key
88  -  OP_EQUALVERIFY, does OP_EQUAL which puts TRUE on the stack if sig is valid
       then does OP_VERIFY which stops the transaciton and marks it invalid if the top stack item is not TRUE
ac  -  OP_CHECKSIG, makes sure the data that has a valid sig is actually this tx's data.
00000000  -  nlocktime


When signing, you replace the signature with your own input scriptpubkey, remove the sighash type byte, replace other inputs with 00, and then add the hash type (8 bytes, byte_reversed) to the end.

So the first signature in this tx signed the double_sha256 of the following:

010000000217cbf067a9ad71b2f69ea66a1c94d04cee26f856b5b4bdccaeccb59761419668010000001976a9140a2217742759c9951371083564d94b8b0317528488acffffffff877a5dd62eab9f1fd28739a9ae7c68fcb0f075b2c2ede13cb3acff15d362e2710100000000ffffffff01709cc901000000001976a914ea0fcd06c9c62e590a8975627d0165b514568a5a88ac0000000001000000

And the second input signed the double_sha256 of the following:

010000000217cbf067a9ad71b2f69ea66a1c94d04cee26f856b5b4bdccaeccb597614196680100000000ffffffff877a5dd62eab9f1fd28739a9ae7c68fcb0f075b2c2ede13cb3acff15d362e271010000001976a9140a2217742759c9951371083564d94b8b0317528488acffffffff01709cc901000000001976a914ea0fcd06c9c62e590a8975627d0165b514568a5a88ac0000000001000000

The unsigned tx, which bitcoind spits out with createrawtransaction, sets both inputs to 00 and does not have a sighash identifier:

010000000217cbf067a9ad71b2f69ea66a1c94d04cee26f856b5b4bdccaeccb597614196680100000000ffffffff877a5dd62eab9f1fd28739a9ae7c68fcb0f075b2c2ede13cb3acff15d362e2710100000000ffffffff01709cc901000000001976a914ea0fcd06c9c62e590a8975627d0165b514568a5a88ac00000000