1. https://cointelegraph.com/news/coinbase-custody-holds-13b-in-assets-under-custody-expects-to-hit-2b-soon
2. https://www.cryptoglobe.com/latest/2019/06/facebook-to-launch-testnet-for-its-libra-cryptocurrency-next-week/
3. https://btcmanager.com/amazon-customers-make-purchases-with-ether-eth-thanks-startup-partnership/
4. https://www.coindesk.com/bitcoin-surpasses-1-million-daily-active-addresses-again
5. https://www.trustnodes.com/2019/06/15/ethereum-2-0-planned-for-launch-on-the-3rd-of-january-2020