Sounds interesting, however, even after a couple of days, I cannot see how you
maintain protection against double spend using OP_CHECKEXPSIG. It is not until
you redeem the OP_CHECKEXPSIG transaction that you reveal which former
transactions that was involved?
I guess I am missing a point here?
/M
On 02/03/2012, at 20:57, Watson Ladd wrote:
> Dear all,
> I am proposing a new opcode for the purposes of anonymous
> transactions. This new opcode enables scripts to be given proof that
> the receiver can carry out or has carried out a previous transaction.
> I'm currently working on a paper that discusses using this opcode for
> anonymous transactions.
>
> Name: OP_CHECKEXPSIG
> Stack before: <sig><pk><hash>
> Stack after: T/F, where is true if sig is a ECDSA signature under pk
> for the hash hash. (Hash is the hash of a message).
> Uses: Preexisting digital cash techniques relied on keeping track of a
> list of turned in notes to forbid double spending. Using
> OP_CHECKEXPSIG we can instead pass the script that gives the nth note
> value proof that the notes {1,...n-1} were turned in and are distinct.
> This enables a coupling of the strong double spend protection of
> Bitcoin with traditional digital cash's strong anonymity.
>
> Sincerely,
> Watson Ladd
>
> ------------------------------------------------------------------------------
> Virtualization & Cloud Management Using Capacity Planning
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> http://www.accelacomm.com/jaw/sfnl/114/51521223/
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