Here are four recent developments in the cryptocurrency space:

1. SEC Initiates Crypto Regulatory Overhaul
The U.S. Securities and Exchange Commission (SEC) has embarked on creating a regulatory framework tailored for the cryptocurrency industry. This marks a departure from its previous stance against industry-specific rules. 

2. President Donald Trump has declared his intention to position the United States as the leading global hub for Bitcoin and cryptocurrencies. In a recent address, he criticized prior regulatory approaches.

3. North Korea Emerges as Major Bitcoin Holder
Through cyber-hacking activities, notably by the Lazarus group, North Korea has amassed approximately 13,580 bitcoins, valued at £886 million, making it the third-largest holder globally after the U.S.

4. UK's Proposal to Shift Stamp Duty to Crypto Transactions
Lisa Gordon, chair of Cavendish investment bank, has proposed applying the UK's 0.5% stamp duty to cryptocurrency transactions instead of equities.