# `gno.land/p/moul/x/daily/b58/v0`
**Base58 (Bitcoin alphabet) codec** — `Encode`, `Decode`, `IsValid`, `Alphabet`.
Pure byte-slice math (the classic div/mod-by-58 carry loop), no `math/big`;
leading zero bytes ↔ leading `1`s. Ported from `mr-tron/base58` / `btcutil/base58`.
```go
import "gno.land/p/moul/x/daily/b58/v0"
s := b58.Encode([]byte("hello")) // "Cn8eVZg"
b := b58.Decode(s) // []byte("hello") (nil if s has a non-alphabet char)
```
**Live demo:** [`r/moul/x/daily/b58demo`](https://github.com/moul/gno-contracts/tree/main/r/moul/x/daily/b58demo/v0)
· render it at [`/r/moul/x/daily/b58demo/v0`](https://gno.land/r/moul/x/daily/b58demo/v0).
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---
Part of **[moul/gno-contracts](https://github.com/moul/gno-contracts)** — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.
> 🧪 **Highly experimental — potentially vibe-coded.** Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md).
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Signatures reconstructed verbatim from vm/qfuncs — interface params keep their inline definitions.