Hello Bitcoin-Dev, I hope this isn't out of line, but I joined the mailing list to try to start a discussion on adding opcodes to make Script Turing Pseudo-Complete as Wright suggested is possible.
--- In line with Wright's suggestion, I propose adding a return stack alongside the, already existing, control stack. The principle opcodes (excluding conditional versions of call and return_from) needed are OP_DEFINITION_START FunctionName: The code that follows is the definition of a new function to be named TransactionSenderAddress.FunctionName. If this function name is already taken, the transaction is marked invalid. Within the transaction, the function can be called simply as FunctionName. OP_DEFINITION_END: This ends a function definition OP_FUNCTION_NAME FunctionName: Gives the current transaction the name FunctionName (this is necessary to build recursive functions) --- OP_CALL Namespace.FunctionName Value TransactionFee: This marks the transaction as valid. It also pushes the current execution location onto the return stack, debits the calling transaction by the TransactionFee and Value, and creates a new transaction specified by Namespace.FunctionName with both stacks continued from before (this may be dangerous, but I see no way around it) with the specified value. OP_RETURN_FROM_CALL_AND_CONTINUE: This pops the top value off the return stack and continues from the specified location with both stacks in tact. --- It would also be useful if a transaction can create another transaction arbitrarily, so to prepare for that, I additionally propose OP_NAMESPACE: Pushes the current namespace onto the control stack This, combined with the ability to make new transactions arbitrarily would allow a function to pay its creator. I understand that this isn't all that is needed, but I think it's a start. I hope this proposal has met you all well, Luke Durback
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