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CTO, Technical Leader. Able to clearly and effectively communicate and coordinate business, marketing, legal, IT and other processes. Worked in blockchain, payments, financial/banking, telco, pharmacy, integration, mobile, gaming, real-estate and start-up projects
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Solana Frontend Crash Course presentation Solana tech videos
I have been studying quite a lot about Account abstraction and ERC-4337 recently. I will point out here some resources worth reviewing: Walk through a thinking process of arriving at the current AA design, showing which problems had to be resolved a...
Innovations come to existence through different means and circumstances. Some of them start as meticulously planned inventions. Others – due to pure luck and uncontrollable external conditions. It’s never just one source that transforms promising inn...
Often, in my projects, there is a need to somehow block access to some parts of the application to people connected from certain sanctioned or otherwise restricted jurisdictions. Doing it on the front end is usually not the best approach, but often, for blockchain projects that do not have any backend components, that might be the only option. Below is a small snippet of the code of how we did it using external APIs. This code can even run on a website powered by IPFS, i.e., without any single backend/server in your infrastructure.
const blockedCountries = [
{ code: "VG", name: "British Virgin Islands" },
{ code: "PA", name: "Panama" },
{ code: "BY", name: "Belarus" },
{ code: "CU", name: "Cuba" },
{ code: "IR", name: "Iran" },
{ code: "IQ", name: "Iraq" },
{ code: "CI", name: "Côte d'Ivoire" },
{ code: "LR", name: "Liberia" },
{ code: "KP", name: "North Korea" },
{ code: "SD", name: "Sudan" },
{ code: "SY", name: "Syria" },
{ code: "ZW", name: "Zimbabwe" },
];
export const isCountryBlocked = async () => {
try {
// Get the user's IP address
const ipResponse = await axios.get("https://api.ipify.org/?format=json");
const ipAddress = ipResponse.data.ip;
// Get the user's country
const locationResponse = await axios.get(`https://api.iplocation.net/?cmd=ip-country&ip=${ ipAddress }`);
const countryCode = locationResponse.data.country_code2;
// Check if the country is blocked
const blockedCountry = blockedCountries.find((country) => country.code === countryCode);
return blockedCountry !== undefined;
} catch (error) {
notify(error);
return false; // Assume country is not blocked if there's an error
}
};