[Chapter-delegates] Blockchain and Food Tracability

[JOHN MORE]

Very helpful clarification. 

John More 

> On Oct 1, 2018, at 12:46 PM, Marcel Waldvogel <marcel.waldvogel at isoc.ch> wrote:
> 
> Richard, Johan, all,
> 
> there are "permissioned blockchains", which is typically what companies mean when they say "Blockchain". They are not based on the Bitcoin et al. "proof of work" concept, but instead build the hash chain on a simple consensus base among members bound by contracts. Waste of electricity is replaced by real-world contracts. Effectively, this boils down to some form of trust. Johan's explanation essentially shows that if there is no trust, there is an enormous amount of complexity involved.
> 
> If the goal is to save money by not only dealing with trustworthy companies, then is the (direct and indirect) cost of all those complexities not higher than just being more careful with whom you do business?
> 
> Some pre-Blockchain "hash chain" technologies which can often be used as a replacements for Blockchains include
> PGP Digital Timestamping service (est. 1995) http://www.itconsult.co.uk/stamper.htm
> git (est. 2005) https://en.wikipedia.org/wiki/Git
> 
> -- 
> -Marcel
> 
>> On Mon, 2018-10-01 at 10:07 +0200, Richard Hill wrote:
>> Please see below.
>> 
>> Thanks and best,
>> Richard
>> 
>> -----Original Message-----
>> From: Chapter-delegates [mailto:chapter-delegates-
>> bounces at elists.isoc.org] On Behalf Of John Levine
>> Sent: lundi, 1. octobre 2018 01:19
>> To: chapter-delegates at elists.isoc.org
>> Subject: Re: [Chapter-delegates] Blockchain and Food Tracability
>> 
>> In article <CAEMuFPT6gOf-HyHBNmhYBuLwaiTn8JCyxrQrPcMF7-
>> Bh8HrbaA at mail.gmail.com> you write:
>> -=-=-=-=-=-
>> 
>> SNIP
>>  
>> Since blockchains are not cheap, 
>> 
>> Good point. As I understand it, the computations required for a blockchain
>> are significant, and there is a non-negligible cost (e.g. electricity). For
>> Bitcoin and other e-currencies, the folks who do the computations are
>> rewarded by getting Bitcoins (or other e-currencies).  So they are
>> compensated financially for the cost of the computations. But if the
>> blockchain is not used for a currency, how do you compensate the people that
>> perform the computations? That is, who pays for all the computing and all
>> the electricity?
>> 
>> 
>> SNIP
>> 
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