QashChain

quantum hash blockchain

• uses the key derivation/hash algorithm from qash-qkdc
• this notebook is a demonstration of how blockchain and quantum hashing can integrate in a hybrid enviornment
• JAX is used for hardware acceleration
• tested on python v3.11

Updates:

• use of random nonce for each block in chain
  • improved chain security
  • pseudo-random numbers are fed into non-deterministic quantum circuit
  • better randomness can be generated since non-deterministic circuit is used
• new device support
  • ibm/qiskit
  • google/cirq
• deterministic and non-determinstic circuit modes
  • non-deterministic:
    • allows truly random output (when NOT on simulator)
    • shots=None or shots=0
    • nonce is generated using this mode
  • deterministic
    • hashes are generated using this mode
    • shots >= 1

Notes:

• this is a basic, publicly accessible implementation and may not cover all aspects of blockchain creation and deployment
  • does not handle consensus algorithm
  • does not have permission system
  • no smart contracts currently
• this blockchain can be adapted to a centralized or decentralized system

Future Goals:

• adapt for other hardware (trapped-ion, neutral atom, etc)
• implement configurable permission system
• implement consensus algorithm (private and public modes)
• add smart contracts feature

Donations (optional):

• Any donation, no matter how small, is greatly appreciated!!
• click here to donate

Citation (this project):

• please cite this project/repo if using it in research and/or development (USE IN RESEARCH/DEVELOPMENT IS ENCOURAGED)

Credits:

• quantum libraries provided by PennyLane:

  • pennylane research paper:

    Ville Bergholm et al. PennyLane: Automatic differentiation of hybrid quantum-classical computations. 2018. arXiv:1811.04968

• accerlation through JAX library:

  jax2018github, author = {James Bradbury and Roy Frostig and Peter Hawkins and Matthew James Johnson and Chris Leary and Dougal Maclaurin and George Necula and Adam Paszke and Jake Vander{P}las and Skye Wanderman-{M}ilne and Qiao Zhang}, title = {{JAX}: composable transformations of {P}ython+{N}um{P}y programs}, url = {http://github.com/google/jax}, version = {0.3.13}, year = {2018},