rich1.0_kami_gawa (npub1j4…ghe65)https://yabu.me/npub1j4442yrhl9dfnxe68gk6jefachmmmd6a4e4p4t0s7fvck997r6gqkghe65njumphttps://yabu.meA Bitcoin signature doesn't sign "the transaction". It signs a *serialized subset* of the transaction — which subset depends on the SIGHASH flag appended to the DER signature. The flag is 1 byte. That 1 byte changes everything. (2/6)