Singular documentation and on-chain release 0.9.0

0.9.0 (2026-10-02)

Features

• deliver the preprod demonstration of one registry and one key (#300) (a08062d)

Fixes

• print and document #300's spending and preview flags where #326's flags check reads them (20fede1)

Singular is a registry of unique names on Cardano that applications can use
with their own rules. This archive includes the compiled smart contracts and
runnable examples: claim a name, change its payment destination, recover
control after losing a key, and retire it permanently so it cannot be reused.
Run the naming application on a local devnet or against your own test-network
node.

Use it

1. Download the singular-onchain-<version>.tar.gz archive and SHA256SUMS
   from this release. The checksum file also covers the documentation archive;
   download that too to check every listed file.
2. Run sha256sum --check SHA256SUMS, extract the on-chain archive, then run
   bash verify-identities.sh inside it to check the compiled validators.
3. For a local devnet, follow README.md in the archive. The runners use
   Nix. That README separates the commands verified against this release's
   source — the bounded registry journey and the identity and fixture
   checks — from the retained legacy row commands, which are not currently
   buildable or verified and must not be relied on. Release instructions
   are corrected forward; already published archives are never rewritten.
4. To use your own node and wallet, follow the
   onboarding runbook.
5. For the shared registry on preprod, follow docs/preprod.md once that
   deployment guide is published.