diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..3940a7b
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,64 @@
+# Contributing to dig-chainsource-interface
+
+Thanks for taking the time to contribute. This repo is a submodule of the DIG Network
+ecosystem and follows the ecosystem-wide GitHub Flow described here.
+
+## Filing an issue
+
+- Search existing issues first to avoid duplicates.
+- Describe the problem or proposal concretely: what you expected, what happened, and
+  how to reproduce it (for a bug) or why it's needed (for a feature).
+- Include crate version (`Cargo.toml` `version`, or `cargo tree -p dig-chainsource-interface`) and
+  environment details for bug reports.
+
+## Contributing code
+
+1. **Fork or branch.** `main` is a protected branch — no direct pushes, no force-push,
+   no direct commits. All work happens on a branch, named after its
+   [Conventional Commit](https://www.conventionalcommits.org/) type
+   (`feat/...`, `fix/...`, `docs/...`, `chore/...`, etc).
+2. **Write a failing test first (TDD).** No production code without a failing test
+   that expresses the desired behaviour. Fix a bug by first reproducing it with a
+   regression test, then making it pass. Keep the regression test permanently.
+3. **Keep coverage at or above the floor.** This repo's CI enforces a
+   **≥80% line-coverage gate** — a PR that drops coverage below the floor
+   fails the build. Cover real logic, branches, and error paths; don't chase
+   coverage on generated/glue code.
+4. **Bump the version.** Every PR that changes behaviour, fixes a bug, or otherwise
+   warrants a release bumps `version` in the root `Cargo.toml` as the **last commit
+   before merge**, following SemVer:
+   - **patch** — a compatible fix, or a chore/docs/test/refactor with no behaviour
+     change.
+   - **minor** — a compatible new capability (backwards-compatible addition).
+   - **major** — a breaking change (removed/renamed API, changed wire/format/schema,
+     or a changed default).
+
+   A CI gate fails any PR whose version does not increase over `main`. After bumping
+   `Cargo.toml`, run `cargo update -w --offline` **before** staging `Cargo.lock`, so
+   the lockfile's own record of this crate's version stays in sync.
+5. **Conventional Commits.** Every commit message and PR title follows
+   `type(scope): summary` (`feat|fix|docs|style|refactor|perf|test|build|ci|chore`).
+   CI lints this — a non-conforming message fails the PR.
+6. **Open a PR against `main`.** The PR body should state what changed and how you
+   verified it. Once opened, `main` must be re-merged into your branch before merge
+   (branch protection requires the PR be up to date) and every review thread —
+   including any automated security-scanning comment — must be resolved.
+
+## Required status checks
+
+`main` is protected and requires every one of these checks to pass, at the current
+commit, before a PR can merge:
+
+- `Format / Clippy / Build / Docs`
+- `Coverage (>=80% lines)`
+- `Lint commit messages`
+- `Check version increment`
+
+If a check doesn't exist yet in branch protection, see `.github/workflows/` for the
+CI jobs this repo runs — new checks are added there as the pipeline grows.
+
+## Review & merge
+
+PRs are squash-merged only, producing exactly one Conventional Commit on `main`. A PR
+merges only when every required check is green and every review thread is resolved —
+there are no exceptions for "small" changes.
diff --git a/Cargo.lock b/Cargo.lock
index 42baab2..9736cf9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -806,7 +806,7 @@ dependencies = [
 
 [[package]]
 name = "dig-chainsource-interface"
-version = "0.3.2"
+version = "0.3.3"
 dependencies = [
  "anyhow",
  "chia-bls 0.36.1",
diff --git a/Cargo.toml b/Cargo.toml
index fe1d176..149da8b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,7 @@ name = "dig-chainsource-interface"
 # IS on the public surface, `chia-protocol`, is unchanged at 0.36.1. So no consumer — including the
 # `lineage-walk` ones — can observe this bump, and nine consumers pinning "0.3" must not be forced
 # to edit a manifest for a change that cannot reach them.
-version = "0.3.2"
+version = "0.3.3"
 edition = "2021"
 rust-version = "1.75.0"
 license = "Apache-2.0 OR MIT"