Quantum alt causes -- it’ll bypass defensive blockchain networks.
Jahara Matisek 18, Ph.D. Candidate in Political Science at Northwestern and coordinator for the War & Society Working Group at the Buffett Institute for Global Studies, 3/14/2018, "The Blockchain Arms Race: America vs. China," https://nationalinterest.org/feature/the-blockchain-arms-race-america-vs-china-24906?nopaging=1/bmo [MSDI-JE-wk1]
3 - Data Manipulation: As increasing numbers of governments, militaries, and companies transition to defensive cyber blockchains to protect vital data, secure communication, and other information; it could all be eventually compromised by quantum computing. Data protection through blockchain technology would be established through public key cryptography and the user storing their private key. However, with a weaponized cyber blockchain in conjunction with a quantum computing algorithms, one could infiltrate such cryptographic systems by reverse engineering a private key. (The technology for quantum computing is still many years away from reaching executable performance, but it should be noticed that China is investing significantly in the technology). While it would require the penetration of 51 percent of distributed ledger operating systems to be a successful attack, this could occur in the near-future if adversarial intelligence agencies focused on this. If the weaponization of blockchain manipulation occurs, it means that electronic election systems—reliant on blockchain—in the West could be eventually compromised, allowing foreign adversaries to “pick-and-choose” winners.