Is Bitcoin Safe?

Updated March 10, 2026|L1

B+

Risk Grade: B+ (20/100)

Bitcoin is rated as moderate risk — some novel mechanisms, generally well-understood.

Low risk — 17 years of unbroken operation without protocol-level exploits, fully decentralized with no admin keys, and the strongest network effects in cryptocurrency. Store-of-value fundamentals are near-perfect on scarcity and liquidity, with adoption accelerating via institutional ETFs.

Bitcoin is the original cryptocurrency and the largest digital asset by market capitalization (~$1.4 trillion). It operates a proof-of-work blockchain secured by over 1 ZH/s of hashrate, making it the most computationally secure network on Earth. Bitcoin's B+ risk grade reflects 17 years of continuous operation without a consensus-level exploit, the simplest mechanism profile of any major blockchain, no oracle dependencies, and fully decentralized governance with no admin keys or freeze capabilities. The primary risk drivers are scale exposure (largest crypto asset, high-value target) and emerging concerns around mining centralization and the long-term security budget as block rewards halve. Its A- store-of-value grade reflects a perfect scarcity score (21M hard cap), unmatched liquidity depth, and institutional adoption via spot ETFs, offset only by continued price volatility relative to traditional stores of value.

TVL

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Mechanisms

Interactions

Value Grade

A-

Key Risks for Bitcoin Users

Bitcoin's security budget depends on block rewards that halve every four years. The April 2024 halving cut rewards to 3.125 BTC per block, and transaction fees currently cover only 5-15% of miner revenue. If fees do not grow as rewards shrink through future halvings, mining profitability and network security could decline over time, though price appreciation has historically compensated.

Mining pool centralization means the top 3-4 pools collectively control over 60% of hashrate, creating theoretical censorship risk. Individual miners can switch pools, and emerging protocols like Stratum V2 aim to decentralize transaction selection, but adoption is still early.

Bitcoin's base layer processes approximately 7 transactions per second with 10-minute block times. During demand spikes, fees can surge to $50+ per transaction, making small-value transfers impractical. Lightning Network and other Layer 2 solutions help but introduce their own trust assumptions.

Quantum computing poses a theoretical long-term threat to Bitcoin's ECDSA cryptography. While no quantum computer today can break Bitcoin's signatures, ~25% of all BTC sits in addresses with exposed public keys. Post-quantum upgrade proposals are in progress but require years to activate.

Top Risk Factors

•Bitcoin's security budget depends on block rewards that halve every four years. After the April 2024 halving cut rewards to 3.125 BTC/block, transaction fees cover only 5-15% of miner revenue. The next halving (~March 2028) drops rewards to 1.5625 BTC. If fee revenue does not scale to replace lost subsidies, hashrate may decline, reducing the cost of a 51% attack.
•Mining pool centralization: Foundry USA, AntPool, and F2Pool collectively control over 60% of Bitcoin's hashrate. While individual miners can switch pools, concentrated pool operators have significant power over transaction ordering and inclusion, creating censorship risk. Stratum V2 adoption is still nascent.
•Quantum computing poses a long-term threat to Bitcoin's ECDSA signatures. Approximately 25% of all Bitcoin (~6-7 million BTC) is in addresses with exposed public keys (P2PK and reused P2PKH), vulnerable to a cryptographically relevant quantum computer. BIP-360 post-quantum upgrade proposals are in progress but require consensus activation.
•Bitcoin's base layer processes ~7 transactions per second with 10-minute block times. During demand spikes, fees can surge to $50+ per transaction. Layer 2 solutions like the Lightning Network address throughput but introduce their own trust assumptions and may redirect fee revenue away from base-layer miners.