A former Meta engineer has publicly identified two structural vulnerabilities he believes could undermine Bitcoin’s long-term viability: the potential threat of quantum computing to the cryptocurrency’s encryption, and the economic challenge posed by declining block rewards for miners. The analysis, shared by TechLeadHD and reported by Wu Blockchain, adds a critical voice to ongoing debates about Bitcoin’s security model and its future as a decentralized financial system. Quantum Computing: A Looming Encryption Risk TechLeadHD, who previously worked as a software engineer at Meta, highlighted the advancement of quantum computers as a direct threat to the cryptographic security of Bitcoin wallets. Bitcoin relies on elliptic curve digital signature algorithms (ECDSA) to secure transactions and prove ownership. A sufficiently powerful quantum computer could theoretically break this encryption, allowing an attacker to derive private keys from public keys and potentially steal funds from active wallets. While practical quantum computers capable of such attacks are not yet a reality, the timeline for their development remains a subject of intense speculation within both the cryptography and cryptocurrency communities. The concern is not immediate, but the potential for a sudden, disruptive technological leap represents what TechLeadHD calls a ‘time bomb’—a risk that could detonate with little warning once the underlying technology matures. The Miner Incentive Problem: Beyond Block Rewards The second vulnerability identified by the former engineer is more immediate and economic in nature. Bitcoin’s security model depends on a decentralized network of miners who validate transactions and secure the blockchain. These miners are compensated through two mechanisms: newly minted bitcoins (the block reward) and transaction fees paid by users. Bitcoin’s supply is capped at 21 million coins, and the block reward is halved approximately every four years in an event known as the ‘halving.’ As the block reward shrinks, miners become increasingly dependent on transaction