The site is down ! They are gonna start something tied up with Microsoft and this is how well they are prepared. LOL.
They should have at least displayed a proper webpage for maintenance related upgrades if they are working on the maintenance.

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Well I just did a little dig up on this info and found that Tanla does seems to launch a new app called "Wisely" with end-to-end encryption.
They are using blockchain as communications platform-as-a-service (CPaaS) and I wonder if blockchain is even needed for a chat application.
They are using  quite a lot of technologies for this which includes

Machine Learning
AI
Azure Databricks
Azure Cosmos DB
Azure PostgresSQL
Microsoft Azure Kubernetes Service


Sources :
https://www.thehindubusinessline.com/companies/tanla-ties-up-with-microsoft-to-launch-blockchain-enabled-cpaas-platform/article33633639.ece
https://www.moneycontrol.com/news/business/tanla-platforms-teams-up-with-microsoft-to-launch-wisely-secure-communication-solution-6384331.html