Don't trust. Verify. ZeroSync allows to verify Bitcoin's chain state in an instant. No need to download hundreds of gigabytes of blocks. A compact cryptographic proof suffices to validate the entire history of transactions and everyone's current balances.

Our first application is to zerosync Bitcoin Core in pruned mode. The long-term vision for ZeroSync is to become a tool box for custom Bitcoin proofs. STARK proofs enable you to transform the blockchain data, enhance it, filter it, index it for efficient queries, and optimise it for your individual use case.

This is an early stage project. Expect frequent breaking changes. Here is the project roadmap.

WARNING: THIS CODE IS STILL FULL OF CRITICAL SECURITY BUGS!

• Python 3.9 (Activate environment: source ~/cairo_venv/bin/activate)
• Cairo. Installation Guide (Programming language for provable programs)
• Protostar (Automated testing)
• Giza (Required for prover. Not necessary for development and testing)
• EJS (Required for compiling)

To access the Cairo code in the src directory from within another Cairo project install the zerosync package:

pip install zerosync

Find a short Cairo example at docs/import_example.cairo on how to import the desired function.

The Utreexo bridge node is required to pass the tests for block verification. It provides the inclusion proofs for the coins spent in a block.

make bridge_node

make unit_test

make integration_test

make chain_proof

 ./docs/todos

The roadmap is available here.