<div dir="ltr"><div dir="ltr">When real-life (off-chain) transactions are tokenized on to the Blockchain, there's always a risk of incorrect information getting permanently recorded. This is in contrast with completely on-chain transactions that are guaranteed to be exactly correct. While there are some ways to mitigate/manage such risk, it's hard to eliminate.<br><br>Even when tokenized correctly on the blockchain, there are still downstream risks in food traceability, such as processing/packaging (for instance, fish from multiple origins get processed and packaged together), or aggregation (for instance, milk from organic and regular sources is mixed and processed at the dairy).<br><br>Despite these risks, the blockchain is an improvement over the current system, in my opinion. However, my initial talks with friends in FairTrade on moving to the Blockchain has not yielded results...maybe such a movement requires a consumer pull as well.<br><br><br><br><br><br><br><br>satish<br></div><div dir="ltr"><br></div><div dir="ltr">--</div><div>ISOC India Trivandrum Chapter<br></div><div dir="ltr"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Sep 29, 2018 at 2:40 PM Richard Barnes <rlb@ipv.sx> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Saying that block chain doesn't help seems to me to be going a bit too far. The benefit is incremental, but there is some.<div dir="auto"><br></div><div dir="auto">Namely, wrapping a database with a block chain means that changes to the database are attributable and traceable. For example, the producers here can have confidence that Walmart isn't going to be able to change their data without it being obvious later. Walmart can have confidence that the database can't get corrupted by a random employee with access to the DB and not the relevant keys.</div><div dir="auto"><br></div><div dir="auto">It is of course useful to ask whether any given block chain could be replaced by an unaided database. But it is sometimes the case that the added rigidity is a useful property.</div><div dir="auto"><br></div><div dir="auto">--Richard</div><div dir="auto"><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Sep 29, 2018, 08:38 Patrik Fältström <<a href="mailto:paf@frobbit.se" target="_blank">paf@frobbit.se</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">As John wrote, blockchain does not help. It may even make the situation worse. Because of issues with access control regarding write operations to the blockchain in question. And if you can manage that, blockchain is not needed.<br>
<br>
This is btw discussed in the Internet of Food Special Interest Group and what John wrote is one of the more important findings. What you need is first of all a global unique identifier that identifies the food item. Then you hook meta data to that identifier. They must be ranked and a third party must be able to decide what attributes created by whom they trust with what confidence in what context. Then lookups is yet another story where for example some attribute and attribute values (maybe created by certain parties) one can only access under special circumstances. I.e. there will be differentiated access to the (total) set of attributes tied to that identifier. Where some of course will be intentional lies.<br>
<br>
Sure, having a write only database, like one implemented with merkle trees of some sort (or even blockchains) might be used as tools somewhere there. But...<br>
<br>
Patrik<br>
<br>
On 28 Sep 2018, at 17:04, Niran Beharry wrote:<br>
<br>
> There is a local system being deployed to do plant to bar (this is for tracking cocoa pods to final product)<br>
> Niran<br>
><br>
> On Fri, Sep 28, 2018, 11:40 John Levine <<a href="mailto:isocmember@johnlevine.com" rel="noreferrer" target="_blank">isocmember@johnlevine.com</a>> wrote:<br>
><br>
>> In article <<br>
>> <a href="mailto:CAN7%2B85fyCw17jZX07Jn8Pi6DyU2Ai_u2sig1yEXKGqQcztxPVQ@mail.gmail.com" rel="noreferrer" target="_blank">CAN7+85fyCw17jZX07Jn8Pi6DyU2Ai_u2sig1yEXKGqQcztxPVQ@mail.gmail.com</a>> you<br>
>> write:<br>
>>> -=-=-=-=-=-<br>
>>> -=-=-=-=-=-<br>
>>><br>
>>><br>
>> <a href="http://theinstitute.ieee.org/resources/standards/how-blockchain-technology-could-track-and-trace-food-from-farm-to-fork" rel="noreferrer noreferrer" target="_blank">http://theinstitute.ieee.org/resources/standards/how-blockchain-technology-could-track-and-trace-food-from-farm-to-fork</a><br>
>>><br>
>>> This is very interesting since its US law to trace food that is<br>
>>> contaminated ie. E Coli etc back to the actual farm<br>
>><br>
>> Tracing food is a dandy idea but this makes the usual blockchain<br>
>> enthusiast error of assuming that if it's on the blockchain it must be<br>
>> true. Tagging the food and accurately identifying what each tag is<br>
>> attached to is the hard part, not sticking the tag IDs in a database.<br>
>><br>
>> All the tags in the world won't help if a sleazy packer can just<br>
>> put a tag for a clean field on produce from a dirty field.<br>
>><br>
>> R's,<br>
>> JOhn<br>
>> _______________________________________________<br>
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>><br>
><br>
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