Sonic’s new proof library lets teams mathematically guarantee their DAG consensus cannot double-spend or fork.

Developers love tests, auditors love checklists, hackers love the gaps in both. Sonic Labs (SONIC) would rather leave nothing to luck. Its research team just dropped a fully open-source TLA+ library that machine-checks the safety of DAG-based consensus protocols from the ground up. 

Think of it as an industrial-grade spell checker for the logic that guards trillions in value. Traditional audits poke around edge cases; formal verification proves entire categories of failure cannot exist, then lets a computer verify the proof instead of a jittery engineer at 3 a.m. 

Sonic’s library bundles common building blocks (broadcast assumptions, leader elections, vertex layering) into reusable modules so new DAG designs can be verified by composition instead of starting from a blank slate. 

The team already modeled Hashgraph, Bullshark, Aleph, DAG-Rider, Cordial Miner, and its own Sonic consensus, shaving months off future upgrades.The workflow is brutal for humans but relaxing for nodes.

Architects write specs as state machines, encode safety invariants like “two honest validators never finalize different blocks,” and let the TLA+ proof assistant churn through every possible execution path. 

If the assistant signs off, exploits like double spends become mathematically impossible unless physics itself lies. Sonic says the joint effort with logicians at the University of Sydney and INRIA ate fourteen person-months across five people-a bargain compared with post-mortems after a nine-figure hack. 

NASA Formal Methods conference liked the approach enough to feature it this year, proof that rocket scientists and blockchain wonks share the same paranoia.

The best part: the repository is public, so rival projects can fork the templates, verify their own DAG tweaks, and stop hand-waving about “battle tested code.” Future protocol upgrades slip into the library like LEGO bricks; the heavy math is already baked. 

Edsger Dijkstra’s old warning that testing only shows the presence of bugs, never their absence, finally meets its antidote. If you plan to trust your treasury to a DAG, Sonic just handed you the calculator to prove it will never fork into oblivion.

For updates and corrections, email newsroom[at]stocktwits[dot]com.<