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Telegram Open Network Architecture Explained by A Network Validator [Deep Dive] Read: Deep Dive. The launch of Telegram Open. Network mainnet has been delayed till early 2020, meanwhile, the testing of TON blockchain is in progress. Test network has been relaunched on 15 November 2019. To become a validator, you must run TON. blockchain Full Node and have a certain amount of test Gram tokens. In testnet2 the validator stake has been lowered to 10,001 test Gram.