How Monero’s proof of work works

Original Article ↗ Hacker News Discussion ↗

RandomX and Monero’s PoW design

  • RandomX is highlighted as a CPU-focused, ASIC/GPU‑resistant PoW that generates and executes pseudo‑random programs.
  • Design goal: if you build a RandomX ASIC, you have effectively built a general‑purpose CPU, capping efficiency gains (~2:1 target over commodity CPUs).
  • Historical context: previous Monero PoW tweaks to fight ASICs were tiring; RandomX is seen as the first design that has “worked” for years.

ASIC/GPU Resistance & Hardware Reality

  • Thread claims RandomX has remained effectively ASIC‑ and GPU‑resistant since ~2018.
  • The only “ASICs” mentioned are devices that are essentially many RISC‑V cores; no big cost/efficiency edge reported.
  • Most mining reportedly happens on AMD Ryzen CPUs; Apple M‑series and even old phones/TV boxes are said to be viable on a hashes‑per‑watt basis.
  • Skepticism: some argue lack of ASICs may reflect weak incentives rather than impossibility.

Mining Practice, Nodes, and Energy

  • Some users mine at home and use the heat as space heating; argument: if replacing resistive heaters, net extra energy cost is near zero.
  • Others counter that heat pumps are socially more efficient and might outperform mining economically.
  • Disagreement over Monero node reliability and LMDB: one side says crashes corrupt local chains; another insists LMDB is crash‑safe except when OS/FS syncing is disabled.

RandomX Technical Questions

  • Question about “just generating branchless programs” is answered: miners don’t choose programs; they’re derived from block data and chained, with enforced instruction mix.
  • Light vs Fast mode: Fast mode precomputes a larger dataset in RAM for mining; Light mode recomputes pieces on demand for verification with less RAM, more CPU.

Crypto Money, PoW vs PoS, and Deflation

  • Extensive debate on why PoW coins mint new units: to both create supply and incentivize decentralized validation.
  • Multiple explanations of how PoW rewards, transaction fees, and eventual fee‑only models might work.
  • Long back‑and‑forth on deflationary vs inflationary money:
    • Pro‑deflation side: hard money disciplines investment and protects small savers from forced risk‑taking.
    • Anti‑deflation side: strong deflation encourages hoarding, destabilizes economies, and amplifies inequality.
  • PoW vs PoS security trade‑offs discussed: PoS can centralize via stake concentration; PoW can centralize via hardware/energy concentration.

Monero Ecosystem & Access

  • RandomX derivatives are mentioned as used beyond Monero (e.g., Tor protection).
  • Concerns raised about upcoming protocol changes (“Carrot”) and view keys potentially affecting privacy and exchange support; implications described as unclear.
  • Buying Monero is harder due to delistings; suggested paths include buying another coin (e.g., LTC/USDC) on KYC exchanges, then swapping via KYC‑light aggregators/exchanges.