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Tech Talk: Intro to Quantum-Ready Vaults using Quantumroot

An video introduction and walk-through of Quantumroot: Quantum-Secure Vaults for Bitcoin Cash.

Jason Dreyzehner

• 2 min read

The Quantumroot contract design offers full 256-bit classical, 128-bit quantum security strength. Quantum spends are ~1.5KB per UTXO, and with cross-input and CashToken-based aggregation, quantum sweeps of 400+ unique addresses or 800+ inputs fit in a single transaction (100KB).

Full announcement and contract code:

Quantumroot: Quantum-Secure Vaults for Bitcoin Cash
A new contract design offers full 256-bit classical, 128-bit quantum security strength. Quantum spends are ~1.5KB per UTXO, and with cross-input and CashToken-based aggregation, quantum sweeps of 400+ unique addresses or 800+ inputs fit in a single transaction (100KB).
bitjson's blogJason Dreyzehner

Repo, example transactions, and tests:

GitHub - bitjson/quantumroot: a quantum-secure Taproot
a quantum-secure Taproot. Contribute to bitjson/quantumroot development by creating an account on GitHub.
GitHubbitjson

Update 2025-11-20: Quantumroot vaults are now live on Chipnet, more discussion on X.com:

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