Re: Modeling a Ledger in RDF

It’s not necessary to keep a balance. The balance can be calculated by
summing the events.

On Mon, May 28, 2018 at 6:24 PM, Melvin Carvalho <melvincarvalho@gmail.com>
wrote:

>
>
> On 28 May 2018 at 11:01, Andrew Bransford Brown <andrewbb@gmail.com>
> wrote:
>
>> That looks like a good control structure to place events into a
>> blockchain-style ledger.
>>
>
> Indeed.  I think since the invent of block chains the terms block chain
> and ledger have become interchangeable.
>
> As a first step I'm looking for a ledger, which in blockchain language
> would be similar to the UTXO (Unspent Transaction Outputs)
>
>
>>
>> Regardless of where or how you store the events, I suggest these:
>> http://promiselanguage.blogspot.com/2017/03/update-to-data-structure.html
>>
>
>
>> http://promiselanguage.blogspot.com/2016/07/contract-scripti
>> ng-language-csl-example.html
>>
>
> Thx for sharing this, but this is transactions, rather than a ledger.  I
> do want to model transactions too, but my first building block is a ledger.
>
>
>>
>> Those events have sufficient granularity to describe any currency or
>> barter transaction.  They support contract law, plus multilateral
>> agreements.  For example, a 1000-person equilateral contract for common
>> property ownership or city residents is possible.
>>
>> (also see attached for examples of a stock trade and a barter trade)
>>
>
> This could be very useful as a workflow methodology, I like it!
>
> A ledger is something like :
>
> Alice <:amount> 1.2
> Bob <:amount> 1056
>
> The important question here is, what is the currency?
>
> There's two ways to do that, with trade offs.
>
> 1. Associate each balance with a currency.  This has the advantage of
> flexibility, but the disadvantage of forcing each line to be it's own data
> structure.
>
> 2. Associate each ledger with a currency.
>
> So I am reaching a conclusion that 2 is the simplest, most performant,
> most easily query-able way to model this in RDF
>
> This is how I modeled it in webcredits 1.0 [1] which I've tested over many
> years.  It strikes me as an optimal solution as input to webcredits 2.0
> which I will tweak slightly with what I've learnt, and to reuse the work
> here.
>
> [1] https://webcredits.github.io/spec/#ledgers
>
>
>>
>> On Mon, May 28, 2018 at 3:20 PM, Melvin Carvalho <
>> melvincarvalho@gmail.com> wrote:
>>
>>> I was pointed to this
>>>
>>> https://w3c.github.io/web-ledger/
>>>
>>> On 26 May 2018 at 12:09, Melvin Carvalho <melvincarvalho@gmail.com>
>>> wrote:
>>>
>>>> Hi All
>>>>
>>>> I'm looking at creating a version 2 of my webcredits system and I'd
>>>> like to reuse any work done by this group, as appropriate.
>>>>
>>>> I was wondering if a Ledger has been modeled, either conceptually, or,
>>>> better still, in RDF.
>>>>
>>>> To my mind a Ledger, in its most basic sense is a list of balances.
>>>> But there are other items that could apply.
>>>>
>>>> Would love any pointers to existing work, if there is some
>>>>
>>>
>>>
>>
>