The last week of February has been exciting for the blockchain and cryptocurrency world. Perhaps the biggest news is Bitfinex and OKEx, 2 major cryptocurrency exchanges, reported distributed denial-of-service (DDoS) attacks on their systems. Malta-based OKEx CEO Jay Hao announced on his Weibo account on Friday the first attack was of a 200-gigabyte severity, but the second had doubled to 400 GB. He claimed the exchange's service is "largely unaffected," despite the DDoS attacks. But Bitfinex seems more severely impacted, after it tweeted to report a suspected DDoS attack Friday morning. Bitfinex CTO Paulo Ardoino told CoinDesk the attacker tried to simultaneously exploit several platform features to increase load in the infrastructure. A DDoS attack attempts to overwhelm the hosting servers of an online service in order to force it to go offline. It is unclear why the exchanges were targeted around the same time or what the attackers hope to gain.

Here is the rest of the week in review:

Coinbase was outed as one of over 2,000 entities from around the globe working with Clearview, a controversial facial recognition technology provider. A new BuzzFeed report cited internal documents and revealed New York-based Clearview AI, a startup facing legal threats from Apple (AAPL  ) and Google (GOOGL  ), as well as calls for greater scrutiny into its practices, has already shared or sold its technology to around 2,200 global authorities and companies. A Coinbase spokesperson confirmed the exchange had tested Clearview's software as regards its "unique needs around security and compliance," but stressed that customer data had not been used in any of its tests. The exchange tested Clearview AI to study if the service could meaningfully bolster efforts to investigate fraud and protect employees and offices against physical threats, according to the spokesperson.

Red Swan, a commercial real estate marketplace, has tokenized $2.2 billion in real estate through security token platform Polymath (POLY). According to Red Swan CEO Ed Nwokedi, $780 million of the total assets is available to investors in pre-sale, while the firm holds another $4 billion in real estate in its tokenization pipeline. The $2.2 billion already tokenized represents 16 different commercial properties based in Austin, Houston, Brooklyn, Oakland, and Ontario, Canada. Tokenization, the process of converting real assets into blockchain-based assets, is still struggling to transform the multi-trillion dollar real estate market as institutions hesitate to reform back offices until they see liquidity in the space. Polymath provides the tokenization technology, while Red Swan appraises, markets, and sells the real estate deals.

Crypto prices tumbled to $242 billion this week, amid the broader global stock market selloffs. For the majors, Litecoin (LTC), Tezos (XTZ), and Bitcoin Cash (BCH) posted outsized double-digit losses, while Tether (USDT) eked up. In the top 100, the biggest losers were Molecular Future (MOF), down 46%, Algorand (ALGO), down 31%, and Cosmos (ATOM), down 31%. The biggest gainers were Kyber Network (KNC), up a whopping 46%, Swipe (SXP), up 6%, and UNUS SED LEO (LEO), up 1%. Next week traders will see how the coronavirus outbreak continues to affect the crypto markets.

The author owns a small amount of BTC and LTC.