[bitcoin-dev] Standard BIP Draft: Turing Pseudo-Completeness
luke.durback at gmail.com
Thu Dec 10 01:35:17 UTC 2015
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,
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the bitcoin-dev