We hardened the cryptography nobody's using yet
The Identity class in uagents_core uses ecdsa-python for signing. We ripped it out and replaced it with coincurve.
Zero test failures. Zero agent restarts. Zero Agentverse complaints.
That should have been louder. When you swap the cryptographic foundation of a framework powering seven production agents and the only observable change is an import line, you've learned something uncomfortable: the thing you just patched isn't load-bearing yet. The door is reinforced. Nobody's trying the knob.
The pure-Python problem
The uagents_core library ships with an Identity class that wraps private keys and signs messages. Under the hood: ecdsa-python, a pure-Python implementation. Pure Python means readable, portable, and slow. It also means the library doesn't enforce low-S signature canonicalization — the fix that prevents signature malleability attacks. Bitcoin Core patched this in 2015. Ethereum never shipped without it.
Our agents sign Agentverse manifests, authenticate protocol messages, and will eventually sign contract calls with real funds attached. Running a signing library that half the industry deprecated a decade ago felt like leaving the front door unlocked because nobody's tried the knob yet.
So we built a shim.
The intercept layer
coincurve_identity_shim.py intercepts the four signing methods on Identity — _sign, _sign_digest, _sign_b64, and the raw signature path — and routes them through coincurve instead. Coincurve wraps libsecp256k1, the same C library Ethereum uses. Fast, canonical, hardened.
The shim installs with one function call at agent startup. After that, every signature flows through coincurve. The Identity class still thinks it's calling its original methods. The agents still think they're calling Identity directly. The cryptography just happens to be production-grade now.
We wrote test_coincurve_identity_shim.py to verify the swap before deploying: shimmed signatures validated against standard secp256k1 verifiers, all four signing methods produced byte-identical output for the same entropy, agent addresses derived from shimmed identities matched the originals exactly.
240 lines of test harness. Zero failures.
Then we deployed on July 4th.
The silence
Agentverse registration: clean. Agent-to-agent protocol messages: no complaints. The security monitor's 12-hour deep scan: passed. The gRPC endpoint warnings stayed identical. The agent inspector showed the same address, same endpoints, same status.
The only log line that changed was the one confirming the shim was active.
Why didn't anything break? Because the signing methods we patched aren't on the critical path yet.
Agent-to-agent protocol messages use those signatures, but we're not running enough peer-to-peer uAgent traffic for a format bug to surface in production. The Agentverse manifest gets signed once at startup — if it's broken, you find out immediately, but it's not under load. The x402 HTTP endpoints use different auth. The crypto transactions already used different signing paths.
We hardened a surface that isn't seeing much friction.
What the framework anticipated
The uagents_core framework is designed for a world where agents negotiate micropayment protocols, exchange signed contract offers, and route messages peer-to-peer through the Agentverse network. The infrastructure exists: the protocol handlers are live in service.py, the agent inspector endpoint works, the manifest publishing flow succeeds. The SecurityCheckRequest and SecurityCheckResponse message types are defined. The door is open.
Nobody's walking through it.
Our agents call HTTP APIs. They write to shared SQLite databases. They post to Bluesky and Nostr. They read from ChromaDB. The agent-to-agent economy the framework anticipates — where another agent sends us a SecurityCheckRequest over uAgent protocol and we verify the signature before responding — hasn't materialized.
Not yet.
The bet
That doesn't mean the patch was wasted. It means we're running production-grade cryptography on a code path that will matter when peer-to-peer traffic shows up. The cost of patching now was low — one shim file, one test harness, one import swap in service.py. The cost of discovering a signature malleability issue after another agent has exploited it would be higher.
Every agent startup now routes through coincurve. The next time an agent on Agentverse sends us a signed protocol message, it'll be validated with the same library Ethereum uses.
The foundation is hardened. The question is whether the traffic will ever arrive — or whether the future the framework was built for looks different than the one we're building.
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