Crate dig_store 

dig-store — the DIG Network DataLayer store manager

A store is the composition of two planes:

• an on-chain anchor — a CHIP-0035 DataLayer singleton (owned by dig-merkle) whose metadata carries the .dig merkle root plus its label / description / size bucket / program hash; and
• an off-chain data plane — the .dig capsule format (owned by dig-capsule).

dig-store composes the two into ONE curated abstraction, with three concerns:

1. Lifecycle — a store is a coin that gets SPENT: create_store, modify_store, melt_store. Each returns an UNSIGNED MerkleCoinSpend; the wallet-backend / node signs + broadcasts. dig-store never holds a key, never signs, never dials the network.
2. Size proof — a store anchors its .dig SIZE on chain as a power-of-2 SizeBucket (1 MB..1 GB, NC-8 minimal encoding). Before keeping a downloaded .dig, a client runs SizeProof::verify: a real size that does not match the anchored bucket is SizeVerdict::Discarded — a dig-node MUST NOT store or serve a size-mismatched capsule.
3. Getters — a comprehensive, chain-proven (NC-9) read surface over every on-chain property (get_store_did_owner, get_store_singleton_tip, get_root_history, get_latest_root, get_latest_root_urn, get_store_urn, and the label / description / size / program-hash getters).

The coin/identity types (Bytes32, Coin, CoinSpend, DataStore, DidRef, DigDataStoreMetadata, MerkleCoinSpend) and the owner type (StoreOwner) are re-exported VERBATIM from dig-merkle, and ChainSource from dig-chainsource-interface, so a consumer depends on ONE canonical shape across the whole DataLayer surface.

Invariants

• INV-1 — No network. dig-store performs no chain I/O itself; on-chain getters take a ChainSource the caller supplies (the user’s verified node or a trusted provider set, NC-9), and lifecycle operations are pure transforms of their inputs.
• INV-2 — No keys, unsigned output. Lifecycle operations return unsigned spends; signing is always the caller’s responsibility (inherited from dig-merkle).
• INV-3 — Minimal on-chain encoding (NC-8). The store’s on-chain footprint is delegated wholesale to dig-merkle, which owns the minimal byte layout; the size is a single-byte bucket.
• INV-4 — On-chain proof always (NC-9). Every getter that returns chain-anchored data proves it against the chain; trust never comes from a self-declared field or an unverified peer.
• INV-5 — .dig back-compat (§5.1). The (deferred) capsule surface reads every older .dig format identically; the public API is extended additively, never broken.

Off-chain capsule getters — deferred (SPEC §11)

open_capsule / get_capsule_identity are NOT in this version: dig-capsule 0.4.0 exposes no lightweight bytes → (store_id, root_hash) reader (the only path is the full wasmtime serve runtime). A Capsule::from_module_bytes reader is being added to dig-capsule release-first and the capsule getters land in a follow-up unit. The download-gating SizeProof needs no capsule open and is complete here.

Re-exports

pub use error::DigStoreError;

pub use error::DigStoreResult;

pub use lifecycle::create_store;

pub use lifecycle::melt_store;

pub use lifecycle::modify_store;

pub use lifecycle::CreateStoreParams;

pub use size::SizeProof;

pub use size::SizeVerdict;

pub use store::get_latest_root;

pub use store::get_latest_root_urn;

pub use store::get_root_history;

pub use store::get_store_description;

pub use store::get_store_did_owner;

pub use store::get_store_label;

pub use store::get_store_program_hash;

pub use store::get_store_singleton_tip;

pub use store::get_store_size_bucket;

pub use store::get_store_urn;

pub use types::RootHistory;

pub use urn::capsule_urn;

pub use urn::retrieval_key;

pub use urn::store_urn;

pub use urn::URN_PREFIX;

Modules

chain

The on-chain read boundary (SPEC §7, NC-9).

error

The dig-store error taxonomy (SPEC §6).

lifecycle

The store LIFECYCLE (SPEC §3): a store is a coin that gets SPENT.

size

The store SIZE and the SIZE PROOF (SPEC §4) — the download-gating core of this crate.

store

The comprehensive on-chain GETTER surface (SPEC §5/§7): every chain-anchored store property.

types

The shared identifier + value types of the store surface.

urn

Store + capsule URN formatting (SPEC §5).

Structs

Coin

CoinSpend

DataStore

Everything that is required to spend a DataStore coin.

DidRef

A reference to a DID, identified by its immutable launcher_id (the DID’s on-chain identity).

DigDataStoreMetadata

The DIG DataLayer metadata: the SDK’s DataStoreMetadata shape with the exact byte count ("b") REPLACED by a power-of-2 size_bucket ("sz"), plus the additive program_hash ("p").

MerkleCoinSpend

The result of building a DataLayer-coin operation: the unsigned coin spends plus the recreated child DataStore.

SizeBucket

A .dig store size quantised to a power-of-2 bucket: exponent k ∈ 0..=10 ↔ 2^k MiB (1 MB..1 GB). See the module docs for the full ladder and the canonical unit (1 MB = 1 MiB).

Enums

StoreOwner

Who is authorized to spend a store coin — the p2 (“inner”) puzzle that guards it.

Traits

ChainSource

A reads-only view of Chia chain state — the single canonical contract every provider implements and every consumer depends on.

Type Aliases

Bytes32