Command-line standalone Label 309 verifier and toolkit (cardanowall), built on the Rust SDK.
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Jun 13, 2026 - Rust
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cip-309
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Label 309 — an open standard for content timestamping (Proof of Existence) anchored on Cardano. Spec, CDDL, JSON Schemas, registries, and conformance vectors.
blockchain specification standard proof-of-existence timestamping conformance cddl cardano notarization cip-309
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Jun 13, 2026
TypeScript reference implementation of Label 309: crypto primitives, canonical-CBOR wire format, and an SDK with a standalone verifier.
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Jun 13, 2026 - TypeScript
Python SDK for Label 309 — a byte-parity twin of the TypeScript reference implementation.
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Jun 13, 2026 - Python
Rust SDK for Label 309 (crate: cardanowall) — a byte-parity twin of the TypeScript and Python implementations.
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Jun 13, 2026 - Rust
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