Swarm Core

Framework-agnostic TypeScript primitives for the Swarm decentralised storage network: typed byte wrappers, content-addressed and single-owner chunks, the Mantaray manifest trie, Reed-Solomon erasure coding, encryption, and postage stamp signing.

No network I/O — this library only builds and parses Swarm's on-disk/on-wire data structures. Talking to a Bee node is left to the consumer (e.g. bee-js).

Install

npm install @ethersphere/core-sdk

Ships as both ESM and CommonJS, with full TypeScript types. Import from the subpath you need:

import { Bytes, Reference } from '@ethersphere/core-sdk/bytes'
import { makeContentAddressedChunk } from '@ethersphere/core-sdk/chunk'

Quick example

import { makeContentAddressedChunk } from '@ethersphere/core-sdk/chunk'

const chunk = makeContentAddressedChunk('Hello, Swarm!')
console.log(chunk.address.toHex())

What's included

Subpath	Contents
@ethersphere/core-sdk/bytes	Bytes and typed wrappers (Reference, BatchId, EthAddress, PrivateKey, PublicKey, Signature, Span, Topic, Identifier, FeedIndex, PeerAddress, TransactionId) plus low-level encoding helpers (hex/base32/base64, concat, slice, integer packing)
@ethersphere/core-sdk/crypto	Keccak-256, ECDSA sign/recover/verify, public/private key derivation
@ethersphere/core-sdk/chunk	Content Addressed Chunks (CAC), Single Owner Chunks (SOC/SOC replicas), the BMT chunk hash, and ChunkSplitter/ChunkJoiner for building and reconstructing chunk trees
@ethersphere/core-sdk/mantaray	MantarayNode — the manifest trie used for directory/collection uploads
@ethersphere/core-sdk/erasure-coding	Reed-Solomon parity, redundancy-level tables, and the batching logic used to add parity chunks to a stream
@ethersphere/core-sdk/encryption	Chunk-level stream cipher and XOR helpers
@ethersphere/core-sdk/stamper	Postage stamp signing (Stamper, stamp()) and effective-capacity math

Every subpath is also re-exported from the package root (@ethersphere/core-sdk), so import { Bytes } from '@ethersphere/core-sdk' works too.

Development

pnpm install
pnpm test          # vitest
pnpm typecheck
pnpm format:check
pnpm build          # esbuild (ESM + CJS) + tsc (.d.ts)
pnpm bench          # perf-sensitive functions, checked against a stored baseline

Requires Node.js 22+.