Performance: GPU batch ecrecover via UltrafastSecp256k1 — 3.21 M/s recoverable sign, batch sender recovery

[shrec]

What this is

UltrafastSecp256k1 is a zero-dependency MIT-licensed secp256k1 engine
with a GPU batch ecrecover API that might be relevant to Otterscan's
transaction sender recovery pipeline.

https://github.com/shrec/UltrafastSecp256k1

Relevant numbers (RTX 5060 Ti, CUDA 12, batch 16K)

Operation	Throughput
ECDSA sign + recid (recoverable)	3.21 M/s
ECDSA verify	4.34 M/s
ecrecover batch	ufsecp_gpu_ecrecover_batch — CUDA/OpenCL/Metal
Keccak-256	included, zero deps
EIP-55 address	included

CPU ecrecover: ~27μs — honest note, slightly slower than libsecp256k1
on single-threaded CPU. GPU batch is where the gap opens.

Why it might matter for Otterscan

Block explorers recover sender addresses from every transaction.
Batch ecrecover on GPU — processing an entire block's transactions
simultaneously — is a different workload profile than single-threaded CPU.

Integration

Rust binding is available with full Ethereum support:

• Keccak-256, EIP-55, EIP-155 sign, ecrecover
• ufsecp_gpu_ecrecover_batch via C ABI (CUDA/OpenCL/Metal)
• MIT license, zero external dependencies

Not asking for anything specific

Just flagging this exists. Happy to share reproducible benchmark
commands or answer questions if there's interest.

Repo: https://github.com/shrec/UltrafastSecp256k1