Multi CSV Transaction

Multi CSV Transaction
2018-02-21  0:59 ` Daniel Robinson
  
From: Praveen Baratam @ 2018-02-20 16:53 UTC (permalink / raw)
  To: bitcoin-dev


[-- Attachment #1.1: Type: text/plain, Size: 388 bytes --]

Hello Everybody,

I need a little clarity about how OP_CHECKSEQUENCEVERIFY (CSV) works in
transactions.

Can I use multiple CSV end points as depicted in the figure below? I
basically want to allow different conditions at different delays.

[image: Inline image 3]

I just want to know if OP_CHECKSEQUENCEVERIFY can be used to achieve the
above.

Thank you.

Praveen
ᐧ

[-- Attachment #1.2: Type: text/html, Size: 1520 bytes --]

[-- Attachment #2: Multi CSV.png --]
[-- Type: image/png, Size: 119739 bytes --]

 permalink raw reply	[|nested]
2018-02-20 16:53 [bitcoin-dev] Multi CSV Transaction Praveen Baratam

  2018-02-21  2:36   ` Praveen Baratam
  
From: Daniel Robinson @ 2018-02-21  0:59 UTC (permalink / raw)
  To: Praveen Baratam, Bitcoin Protocol Discussion


[-- Attachment #1.1: Type: text/plain, Size: 1818 bytes --]

Yes, although it's a functionality of Bitcoin Script generally, not OP_CSV
in particular. Bitcoin Script allows you to use nested IF statements, and
enforce whatever different conditions you want in each branch.

Here's your contract in Ivy <https://ivy-lang.org/bitcoin/>:

contract MultiCSV(
  bob: PublicKey,
  carol: PublicKey,
  bobDelay: Duration,
  carolDelay: Duration,
  val: Value
) {
  clause bobSpend(sig: Signature) {
    verify checkSig(bob, sig)
    verify older(bobDelay)
    unlock val
  }
  clause carolSpend(sig: Signature) {
    verify checkSig(carol, sig)
    verify older(carolDelay)
    unlock val
  }
  clause bothSpend(bobSig: Signature, carolSig: Signature) {
    verify checkMultiSig([bob, carol], [bobSig, carolSig])
    unlock val
  }
}

It compiles to the following Bitcoin Script:

PUSH(carolKey) PUSH(bobKey) 2 PICK 2 EQUAL IF ROT DROP 0 4 ROLL 4 ROLL 2
2ROT 2 CHECKMULTISIG ELSE ROT IF DROP CHECKSIGVERIFY PUSH(carolDelay)
CHECKSEQUENCEVERIFY DROP 1 ELSE NIP CHECKSIGVERIFY PUSH(bobDelay)
CHECKSEQUENCEVERIFY DROP 1 ENDIF ENDIF

On Tue, Feb 20, 2018 at 5:32 PM Praveen Baratam via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org> wrote:

> Hello Everybody,
>
> I need a little clarity about how OP_CHECKSEQUENCEVERIFY (CSV) works in
> transactions.
>
> Can I use multiple CSV end points as depicted in the figure below? I
> basically want to allow different conditions at different delays.
>
> [image: Multi CSV.png]
>
> I just want to know if OP_CHECKSEQUENCEVERIFY can be used to achieve the
> above.
>
> Thank you.
>
> Praveen
> ᐧ
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists•linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>

[-- Attachment #1.2: Type: text/html, Size: 3768 bytes --]

[-- Attachment #2: Multi CSV.png --]
[-- Type: image/png, Size: 119739 bytes --]

 permalink raw reply	[|nested]
2018-02-21  0:59 ` Daniel Robinson

  
From: Praveen Baratam @ 2018-02-21  2:36 UTC ( / )
  To: Daniel Robinson;  Bitcoin Protocol Discussion




Thank you Daniel!

Your detailed explanation did clear things up :-)
ᐧ

On Wed, Feb 21, 2018 at 6:29 AM, Daniel Robinson <danrobinson010@gmail•com>
wrote:

> Yes, although it's a functionality of Bitcoin Script generally, not OP_CSV
> in particular. Bitcoin Script allows you to use nested IF statements, and
> enforce whatever different conditions you want in each branch.
>
> Here's your contract in Ivy <https://ivy-lang.org/bitcoin/>:
>
> contract MultiCSV(
>   bob: PublicKey,
>   carol: PublicKey,
>   bobDelay: Duration,
>   carolDelay: Duration,
>   val: Value
> ) {
>   clause bobSpend(sig: Signature) {
>     verify checkSig(bob, sig)
>     verify older(bobDelay)
>     unlock val
>   }
>   clause carolSpend(sig: Signature) {
>     verify checkSig(carol, sig)
>     verify older(carolDelay)
>     unlock val
>   }
>   clause bothSpend(bobSig: Signature, carolSig: Signature) {
>     verify checkMultiSig([bob, carol], [bobSig, carolSig])
>     unlock val
>   }
> }
>
> It compiles to the following Bitcoin Script:
>
> PUSH(carolKey) PUSH(bobKey) 2 PICK 2 EQUAL IF ROT DROP 0 4 ROLL 4 ROLL 2
> 2ROT 2 CHECKMULTISIG ELSE ROT IF DROP CHECKSIGVERIFY PUSH(carolDelay)
> CHECKSEQUENCEVERIFY DROP 1 ELSE NIP CHECKSIGVERIFY PUSH(bobDelay)
> CHECKSEQUENCEVERIFY DROP 1 ENDIF ENDIF
>
> On Tue, Feb 20, 2018 at 5:32 PM Praveen Baratam via bitcoin-dev <
> bitcoin-dev@lists•linuxfoundation.org> wrote:
>
>> Hello Everybody,
>>
>> I need a little clarity about how OP_CHECKSEQUENCEVERIFY (CSV) works in
>> transactions.
>>
>> Can I use multiple CSV end points as depicted in the figure below? I
>> basically want to allow different conditions at different delays.
>>
>> [image: Multi CSV.png]
>>
>> I just want to know if OP_CHECKSEQUENCEVERIFY can be used to achieve the
>> above.
>>
>> Thank you.
>>
>> Praveen
>> ᐧ
>> _______________________________________________
>> bitcoin-dev mailing list
>> bitcoin-dev@lists•linuxfoundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>>
>


-- 
Dr. Praveen Baratam

about.me <http://about.me/praveen.baratam>