I wanted this to create a transaction on testnet that exercised all of the SIGHASH_ modes (see txid 8ccc87b72d766ab3128f03176bb1c98293f2d1f85ebfaf07b82cc81ea6891fa9 on testnet3)
It adds a fourth optional string argument to signrawtransaction, which can be ALL / NONE / SINGLE / ALL|ANYONECANPAY / etc. It just converts the string to one of the enum SIGHASH_ constants and then uses that signing mode when signing.
I created that testnet transaction by:
- I manually created a raw transaction with six inputs and 7 outputs
- I extracted the private keys (using dumpprivkey) corresponding to the six inputs
- I called signrawtransaction six times to sign each of the six inputs separately, passing in just one of the private keys and using a different SIGHASH_ mode each time.
- I called sendrawtransaction to broadcast the completed transaction.
