Walmart to Order Suppliers to Move to DLT in a Year

As reported, any company supplying Walmart with leaf greens must work on the IBM Food Trust network to ensure end-to-end traceability of its products
25 September 2018   1179

Walmart intends to begin selling leafy greens within a year, information about which will be recorded in the blockchain, the company said in a press release.

World largest in terms of revenue and number of employees retailer reported that it notified leafy greens suppliers about the need to integrate a tracking system on a blockchain system developed jointly with IBM by September 2019.

According to the letter sent to the suppliers, any company supplying Walmart with leaf greens must work on the IBM Food Trust network to ensure end-to-end traceability of its products. The blockchain platform will allow to establish the origin of such products quickly, while in the current conditions this "task is practically irresolvable".

Earlier experts of the Center for Disease Control warned citizens about the danger of eating a salad grown near the town of Yuma, Arizona. Walnart's vice president of food safety Frank Yiannas said that now customers can hardly determine where the products they offered were manufactured.

But it was difficult for consumers to know how to determine where their lettuce was grown. None of the bags of salad had ‘Yuma, Arizona’ on them. In the future, using the technology we’re requiring, a customer could potentially scan a bag of salad and know with certainty where it came from.

Frank Yiannas

VP of Food Safety, Walmart

The first phase of the program involves ensuring "one-step traceability" by direct suppliers by the end of January. Other companies that perform the role of intermediaries should implement the system integration until the end of September next year across the vertical. 

Potentional Vulnerabilities Found in ETH 2.0

Least Authority have found potentional security issues in the network P2P interaction and block proposal system
26 March 2020   935

Technology security firm Least Authority, at the request of the Ethereum Foundation, conducted an audit of the Ethereum 2.0 specifications and identified several potential vulnerabilities at once.

Least Authority said that developers need to solve problems with vulnerabilities in the network layer of peer-to-peer (P2P) interaction, as well as in the block proposal system. At the same time, the auditor noted that the specifications are "very well thought out and competent."

However, at the moment there is no large ecosystem based on PoS and using sharding in the world, so it is impossible to accurately assess the prospects for system stability.
Also, information security experts emphasized that the specifications did not pay enough attention to the description of the P2P network level and the system of records about Ethereum nodes. Vulnerability risks are also observed in the block proposal system and the messaging system between nodes.

Experts said that in the blockchains running on PoS, the choice of a new block is simple and no one can predict who will get the new block. In PoS systems, it is the block proposal system that decides whose block will fall into the blockchain, and this leads to the risk of data leakage. To solve the problem, auditors suggested using the mechanism of "Single Secret Leader Election" (SSLE).

As for the peer-to-peer exchange system, there is a danger of spam. There is no centralized node in the system that would evaluate the actions of other nodes, so a “malicious" node can spam the entire network with various messages without any special punishment. The solution to this problem may be to use special protocols for exchanging messages between nodes.