Quote from: isarac3 on March 29, 2021, 05:29:46 AM

How can one calculate message hash [h] of a raw transaction?

I will choose this TESTNET transaction to show you: https://tbtc.bitaps.com/ff948290ff332aed8f0e5d767118a02e8671578c6775a333bb4ee4d6ccfcf639/mpPQhMr2CuRn1AQJgCmcMhH8PgrYaKknSa

Click on the raw transaction option;

You will see this:

0100000001b9c222461de38f9fcdc121a47e27c5a08932232b00adc1e2c3fbfb55041b942201000 0006a4730440220503434f27f0d5dc23c01a5d2b2b2abb902e2816987515dafa619ffded8fc2ec6 02204c30c0b82c9afd623e140bf2d6badfa2f02414ef3ffc603e83f2f65a264ce2b801210355d77 643f9bbccde7a1f05d8fa72c0b6c53075cdc299753242320ef9c6611233ffffffff01905f010000 0000001976a914b95bfe11c932408ae44da26872b3c8cd5d61691a88ac00000000

Remove the code and bytes from the signature and the public key

0100000001b9c222461de38f9fcdc121a47e27c5a08932232b00adc1e2c3fbfb55041b942201000 0006a4730440220503434f27f0d5dc23c01a5d2b2b2abb902e2816987515dafa619ffded8fc2ec6022 04c30c0b82c9afd623e140bf2d6badfa2f02414ef3ffc603e83f2f65a264ce2b801210355d77643 f9bbccde7a1f05d8fa72c0b6c53075cdc299753242320ef9c6611233 ffffffff01905f0100000000001976a914b95bfe11c932408ae44da26872b3c8cd5d61691a88ac0 0000000

Place the RipeMD-160 614bd7ef80e1105fc86895d339eff49a9c56bdad a few more bytes and opcode

0100000001b9c222461de38f9fcdc121a47e27c5a08932232b00adc1e2c3fbfb55041b942201000 0001976a914614bd7ef80e1105fc86895d339eff49a9c56bdad88ac ffffffff01905f0100000000001976a914b95bfe11c932408ae44da26872b3c8cd5d61691a88ac0 000000001000000

Now access this site https://emn178.github.io/online-tools/sha256.html

0100000001b9c222461de38f9fcdc121a47e27c5a08932232b00adc1e2c3fbfb55041b942201000 0001976a914614bd7ef80e1105fc86895d339eff49a9c56bdad88acffffffff01905f0100000000 001976a914b95bfe11c932408ae44da26872b3c8cd5d61691a88ac0000000001000000

Second hash

DONE!
c340c9ece755e54bf99c34386eb8e19befd76cb3ddd5b47a4d52be65fea05b6d