Re: Modeling a Ledger in RDF

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-
> scripting-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
>>>
>>
>>
>