Pay3Tech Stack
Both Rust and Go have shipped real, production blockchains. Given Pay3's stated goals — fastest, most secure, lowest fee — Rust is the stronger choice, and it's what today's prototype is already written in.
l1_node testnet prototype is written in Rust today — see Run It Yourself.Rust vs. Go
| Rust | Go | |
|---|---|---|
| Memory model | Manual-but-safe via ownership/borrow checker — no garbage collector | Garbage collected — simpler to write, but introduces GC pause latency |
| Raw performance | Near C/C++, zero-cost abstractions | Very good, but a step below Rust for CPU-bound, latency-critical code |
| Concurrency | Compiler-enforced data-race freedom; async via tokio | Goroutines + channels — famously easy to write, mature scheduler |
| Latency predictability | No GC pauses → more predictable tail latency | GC pauses are small in modern Go but non-zero and less predictable under load |
| Time to a working prototype | Slower — real time spent on lifetimes and the borrow checker | Faster — quicker to get an MVP chain running |
| Proven high-performance L1s | Solana, NEAR, Polkadot/Substrate, Aptos, Sui | Cosmos SDK / CometBFT, go-ethereum (Geth) |
| Networking libraries | rust-libp2p, mature tokio ecosystem | go-libp2p — the original implementation, extremely battle-tested |
Why Rust, for Pay3 specifically
No GC pauses means more predictable latency in exactly the code paths — consensus and execution — where sub-second finality is being engineered. And the compiler catching memory bugs and data races before they ship matters more here than in most software: a consensus bug means a chain fork or halt in production, not just a crashed process you restart. That combination is why nearly every recent performance-focused L1 has reached for Rust, and why Pay3 does too.
Go remains the right call when the actual constraint is team velocity, or when deep interoperability with the Cosmos/IBC ecosystem matters — plenty of production chains run fine in Go. It just isn't the top pick when the explicit goal is squeezing out every millisecond, which is Pay3's goal.
Building on existing primitives, not from zero
Rather than hand-rolling a VM, a P2P stack, and an RPC server from scratch, Pay3's execution and consensus core is being built in Rust on top of proven primitives:
revm— an EVM-compatible execution enginerust-libp2p— peer-to-peer networkingtokio— the async runtimejsonrpsee— the RPC server
This gets most of Rust's performance ceiling and full EVM compatibility, without reinventing a P2P stack or a virtual machine from nothing — the pragmatic middle path between forking an existing framework wholesale and building every layer from scratch.