Seems ... acceptable from first glance.
Though I propose an ammendent to either
(1)
make the script: OP_NOP1 HASH160 push-20-byte-hash EQUAL to make it
extremely easy to see from the first byte that this is verly likely to be
a special transaction (or more accurately if the first byte isn't
OP_NOP1 then you immediately know it isn't a special script and can even
disregard the token).
or
(2)
If you are feel like spending another byte make the script:
OP_NOP1 push-special-script-version-number special-script
and assign 1 to this special script, making this case:
OP_NOP1 OP_1 HASH160 push-20-byte-hash EQUAL
On Mon, 2 Jan 2012, Gavin Andresen wrote:
Here are my latest thoughts on a safer OP_EVAL alternative, inspired
by all the ideas and agitated IRC and email
discussions of the last week or so:
Goal: Let users publish a short funding address that is the hash of
an arbitrary redemption Script revealed when they spend the funds,
implemented in a backwards-compatible-in-the-blockchain way.
Proposal:
A new 'standard' transaction type, pay to Script hash:
scriptPubKey: HASH160 push-20-byte-hash EQUAL
Redeemed with the same scriptSig as the OP_EVAL proposal:
signatures serialized Script
Old clients/miners will ignore signatures and just validate that the
hash of serialized Script matches.
New clients/miners will recognize the new type of transaction and will
do the following additional validation:
1. Fail validation if there were any operations other than push data
in the original scriptSig.
2. Deserialize the top (last) item on the scriptSig stack (fail
validation if it fails to deserialize properly).
3. Run an additional validation on the deserialized script, using the
remaining items on the scriptSig stack and the deserialized script as
the scriptPubKey.
---
As Amir said in IRC chat today, the idea is a hack but I like it.
I like it, too-- it is cleaner than OP_EVAL, more straightforward to
implement, and pretty much exactly matches the feature I care about
(moving code from the scriptPubKey to the scriptSig). There are no
special cases like CODESEPARATORS not allowed in serialized
script.
--
Russell O'Connor http://r6.ca/
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''
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