BTCC’s Mobi and Bitwala turn away from non-EU Visa users

BTCC’s Mobi and Bitwala announce the suspension of Bitcoin cards for non-EU Visa network users
01 September 2017   3759

China-based BTCC's Mobi wallet application is to stop offering its Visa debit card service to non-European residents on October 15th, 2017 as because of the new licensing restrictions from Visa.

On top of that, Berlin-based Bitwala, a Bitoin wallet management app, also announced they would be suspending service on all existing debit cards for users who live outside of the Visa European territory. Thus, according to Visa's new regulations, only customers in the EEA and selected adjacent states will be able to order the Bitwala Debit Card. Bitwala will suspend service on all existing Debit Cards for users who live outside of the European territory by October 15th, 2017. The new regulations came into force on August 21st and users who have ordered their cards from August 9th have been refunded.

Furthermore, Bitwala team has also announced some changes in their currency policy:

Bitwala currency suspension Bitwala currency suspension

As reported, in the past week, Xapo and Shakepay also announced that they would be halting service of their Bitcoin enabled debit cards to all card holders who reside outside of the Visa European payment network.

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   212

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.