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From: ZmnSCPxj <ZmnSCPxj@protonmail.com>
To: Matt Bell <mappum@gmail.com>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Proof-of-Stake Bitcoin Sidechains
Date: Tue, 22 Jan 2019 09:19:27 +0000	[thread overview]
Message-ID: <wTXHV7W_AXHz5xdhXJVJr2OdSpEOaFh0PBQubFdZv4JyF6SlImszj2QyF9G-_Dem06A3iBWLF3vdgiHC_NlsVqy7DFX5XTphajNnMqiU6r0=@protonmail.com> (raw)
In-Reply-To: <CACV3+OXQsUsgquJWZ9o8tTtak=axnbsdiNgLzF-j6yz1dDv4bA@mail.gmail.com>

Good Morning Matt,

> ### ZmnSCPxj,
>
> I'm intrigued by this mechanism of using fixed R values to prevent multiple signatures, but how do we derive the R values in a way where they are
unique for each blockheight but still can be used to create signatures or verify?

One possibility is to derive `R` using standard hierarchical derivation.
Then require that the staking pubkey be revealed to the sidechain network as actually being `staking_pubkey = P + hash(P || parent_R) * G` (possibly with some trivial protection against Taproot).
To sign for a blockheight `h`, you must use your public key `P` and the specific `R` we get from hierarchical derivation from `parent_R` and the blockheight as index.



Regards,
ZmnSCPxj


  reply	other threads:[~2019-01-22  9:19 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-18 22:59 [bitcoin-dev] Proof-of-Stake Bitcoin Sidechains Matt Bell
2019-01-19  1:42 ` ZmnSCPxj
2019-01-19  5:35   ` Matt Bell
2019-01-20  2:06     ` ZmnSCPxj
2019-01-21 18:47       ` Matt Bell
2019-01-22  9:19         ` ZmnSCPxj [this message]
2019-01-22 14:58           ` Satoshin
2019-01-22 20:03             ` Dustin Dettmer
2019-01-22 16:33           ` Dustin Dettmer
2019-01-24 10:03             ` ZmnSCPxj
2019-01-24 18:46               ` Matt Bell
2019-01-25  0:16               ` Peter Todd
2019-01-25  5:33                 ` ZmnSCPxj
2019-01-22 20:22           ` Dr Adam Back
2019-02-01  9:19 ` ZmnSCPxj

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