Canton Network Repositories Skill

Canton Network Repositories

Repository Hierarchy

Splice (e.g., 0.5.4)     github.com/digital-asset/decentralized-canton-sync
  └─ depends on
Canton (e.g., 3.4.9)     github.com/digital-asset/canton
  └─ depends on
DAML SDK (e.g., 3.4.9)   github.com/digital-asset/daml

Version Mapping

| Splice | Canton | DAML SDK | Protocol | LF Default | LF Available | |--------|--------|----------|----------|------------|--------------| | 0.5.4 | 3.4.9 | 3.4.9 | PV34 | 2.1* | 2.2 (verified) | | 0.5.3 | 3.4.8 | 3.4.8 | PV34 | 2.1* | 2.2 | | 0.4.x | 3.3.x | 3.3.x | PV33 | 2.1 | 2.1 |

*Open-source Splice 0.5.4 ships with SDK snapshot 3.3.0-snapshot.20250502 (pre-dates LF 2.2). LF 2.2 was added to the SDK on 2025-10-03. Updating to SDK 3.4.9 enables LF 2.2 builds.

Key Configuration Files

| Purpose | Repo | File | |---------|------|------| | LF version definitions | daml | sdk/daml-lf/language/.../LanguageVersion.scala | | damlc target validation | daml | sdk/compiler/damlc/lib/DA/Cli/Options.hs | | Canton version | canton | VERSION | | Built-in DARs | canton | community/common/src/main/daml/ | | Splice LF config | splice | project/CantonDependencies.scala | | Package targets | splice | daml/*/daml.yaml | | Docker builds | splice | cluster/images/*/Dockerfile |

Splice LF config (project/CantonDependencies.scala):

val daml_language_versions = Seq("2.1")  // ← LF target; change to "2.2" for upgrade
val daml_compiler_version = sys.env("DAML_COMPILER_VERSION")

Package ID Derivation

Package IDs are cryptographic hashes of: source content + LF version (--target) + SDK/stdlib version + dependency package IDs.

Changing LF version = different package IDs = incompatible packages. Canton validates that upgraded packages use equal or newer LF version; mixing LF versions on the same ledger causes validation failures.

Enterprise vs Community Canton

| Feature | Enterprise | Community | |---------|------------|-----------| | Transaction processing | Parallel | Sequential | | Database | PostgreSQL, Oracle | PostgreSQL only | | HA Domain | Supported | Embedded only | | Pruning | Full | Limited |

Build Commands

# Community Canton participant
cd canton && sbt "community/app/assembly"
# Output: community/app/target/scala-2.13/canton-community.jar

# Splice applications (requires DAML_COMPILER_VERSION env var)
cd decentralized-canton-sync && sbt compile

Upgrading to LF 2.2 (Verified with SDK 3.4.9)

project/CantonDependencies.scala: val daml_language_versions = Seq("2.2")
nix/daml-compiler-sources.json: { "version": "3.4.9" }
All daml/*/daml.yaml: set sdk-version: 3.4.9 and --target=2.2
Remove -Wno-ledger-time-is-alpha from all daml.yaml files (not in SDK 3.4.9)
Build: daml build -p daml/splice-util && daml build -p daml/splice-amulet

Community-built DARs have identical package IDs to enterprise at the same LF version (verified 2025-12-24).

Troubleshooting

"Unknown Daml-LF version: 2.2": damlc binary doesn't support 2.2. Check daml damlc --help for supported targets; upgrade to SDK 3.4.9.

Package ID mismatch: different --target values between builds. Check: unzip -p package.dar META-INF/MANIFEST.MF | grep Sdk-Version

Upgrade validation failed: swapping enterprise (LF 2.2) with community (LF 2.1) packages. Use DAR injection to maintain LF 2.2 compatibility.

Agent Skills: Canton Network Repositories

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