[//]:content-type-MARKDOWN-DONOT-DELETE Gate Learn has released 12 new articles this week ! In blockchain technology, a [keylogger](https://www.gate.io/learn/articles/what-is-a-keylogger/2048 "keylogger") is a hacker tool that records and reports user activities when interacting with devices; the approval of a [Bitcoin ETF](https://www.gate.io/learn/articles/spot-bitcoin-etf-approval-and-the-next-bitcoin-halving-a-catalyst-to-the-next-crypto-bull-run/2018 "Bitcoin ETF") and the anticipated Bitcoin halving event in April 2024 are expected to propel the cryptocurrency market into another bull run; the SEC has formally approved applications for 11 [Bitcoin spot ETFs](https://www.gate.io/learn/articles/what-the-official-approval-of-bitcoin-spot-etfs-means-for-the-crypto-industry/2055 "Bitcoin spot ETFs"), signaling that Bitcoin will no longer be isolated from traditional markets but will be formally integrated into the global financial system. Moving on to DeFi, [Request (REQ)](https://www.gate.io/learn/articles/what-is-request-all-you-need-to-know-about-req/2050 "Request (REQ)") is a decentralized network for payment requests, allowing anyone to securely request and receive payments without intermediaries; [Fusionist](https://www.gate.io/learn/articles/what-is-fusionist-all-you-need-to-know-about-ace/2043 "Fusionist"), supported by the Endurance blockchain, is an innovative project that combines gaming with decentralized finance; [Solscan](https://www.gate.io/learn/articles/what-is-solscan-and-how-to-use-it/2042 "Solscan") is used to explore and analyze transactions, wallet addresses, contracts, NFTs, and DeFi projects on the Solana blockchain; [Backed Finance](https://www.gate.io/learn/articles/understanding-backed-finance-a-guide-for-beginners/2056 "Backed Finance") is an RWA sovereign debt tokenization protocol aiming to provide investors with exposure to various real-world assets. Introduction to the metaverse domain, [metaverse cryptocurrencies ](https://www.gate.io/learn/articles/top-15-metaverse-cryptocurrencies-in-2024/2049 "metaverse cryptocurrencies ")are digital currencies specifically designed for the metaverse and related projects, serving as the lifeline of these virtual worlds. NFTs will be discussed next, with the NFT industry market cap reaching billions of dollars, and several [NFT artists](https://www.gate.io/learn/articles/famous-nft-artists/2045 "NFT artists") holding a significant portion of this valuation; [Singular](https://www.gate.io/learn/articles/singular-the-ultimate-guide-to-modular-nfts-marketplace/2046 "Singular") is a marketplace platform dedicated to modular non-fungible tokens, enabling users to create, buy, sell, and exchange advanced modular NFTs; the [NADA protocol ](https://www.gate.io/learn/articles/what-is-nada-protocol-all-you-need-to-know-about-nada/2019 "NADA protocol ")is revolutionizing the NFT mobile gaming sector by introducing a play-to-earn model with real-world value. Lastly, in trading, [peer-to-peer (P2P) cryptocurrency trading platforms](https://www.gate.io/learn/articles/top-10-p2p-trading-platforms/2044 "peer-to-peer (P2P) cryptocurrency trading platforms") are online markets connecting cryptocurrency buyers and sellers, enabling financial transactions to occur directly between parties without financial institutions. Learn more