diff --git a/apps/app/src/test/scala/org/lfdecentralizedtrust/splice/integration/tests/CryptoHashEquivalenceIntegrationTest.scala b/apps/app/src/test/scala/org/lfdecentralizedtrust/splice/integration/tests/CryptoHashEquivalenceIntegrationTest.scala
new file mode 100644
index 0000000000..ccb86e5c7e
--- /dev/null
+++ b/apps/app/src/test/scala/org/lfdecentralizedtrust/splice/integration/tests/CryptoHashEquivalenceIntegrationTest.scala
@@ -0,0 +1,273 @@
+package org.lfdecentralizedtrust.splice.integration.tests
+
+import com.daml.ledger.javaapi.data.{
+  CreatedEvent,
+  CreateCommand,
+  DamlList,
+  DamlRecord,
+  ExerciseCommand,
+  ExercisedEvent,
+  Identifier,
+  Party,
+  Text,
+  Value,
+}
+import com.digitalasset.canton.resource.DbStorage
+import com.digitalasset.canton.topology.PartyId
+import com.digitalasset.daml.lf.data.Ref
+import org.lfdecentralizedtrust.splice.integration.EnvironmentDefinition
+import org.lfdecentralizedtrust.splice.integration.tests.SpliceTests.IntegrationTest
+import org.lfdecentralizedtrust.splice.util.{DarUtil, WalletTestUtil}
+import slick.jdbc.canton.ActionBasedSQLInterpolation.Implicits.actionBasedSQLInterpolationCanton
+
+import java.io.File
+import scala.collection.mutable
+import scala.jdk.CollectionConverters.*
+
+/** Equivalence test: Daml (real participant) == SQL (scan Postgres).
+  *
+  * Validates that the plpgsql hash functions produce identical results
+  * to the Daml CryptoHash module. Daml is the authority.
+  *
+  * Uses a shared environment so the dar is uploaded and proxy created once,
+  * then each hash function gets its own test.
+  */
+@org.lfdecentralizedtrust.splice.util.scalatesttags.NoDamlCompatibilityCheck
+class CryptoHashEquivalenceIntegrationTest extends IntegrationTest with WalletTestUtil {
+
+  import CryptoHashEquivalenceIntegrationTest.*
+
+  override def environmentDefinition: SpliceEnvironmentDefinition =
+    EnvironmentDefinition
+      .simpleTopology1Sv(this.getClass.getSimpleName)
+      .withManualStart
+
+  "CryptoHash equivalence (Daml == SQL)" should {
+
+    "set up environment" in { implicit env =>
+      startAllSync(sv1Backend)
+      svParty = sv1Backend.getDsoInfo().svParty
+      svDb = sv1Backend.appState.storage
+
+      clue("Upload dar and create CryptoHashProxy") {
+        sv1Backend.participantClient.upload_dar_unless_exists(darPath)
+        val createArgs = new DamlRecord(
+          java.util.List.of(
+            new DamlRecord.Field("owner", new Party(svParty.toProtoPrimitive))
+          )
+        )
+        val createTx =
+          sv1Backend.participantClientWithAdminToken.ledger_api_extensions.commands
+            .submitJava(
+              actAs = Seq(svParty),
+              commands = Seq(new CreateCommand(templateId, createArgs)),
+            )
+        proxyContractId = createTx.getEvents.asScala
+          .collectFirst { case ce: CreatedEvent => ce.getContractId }
+          .getOrElse(fail("No CreatedEvent from CryptoHashProxy create"))
+      }
+    }
+
+    allTestCaseDefs.foreach { tcDef =>
+      tcDef.description in { implicit env =>
+        val damlHash = clue("Daml") { exerciseDaml(tcDef.op) }
+        intermediates(tcDef.description) = damlHash
+        clue("SQL should match Daml") {
+          val sqlHash = svDb
+            .query(
+              sql"""select #${toSqlExpr(tcDef.op, resolveRef)}""".as[String].head,
+              "test.sqlHash",
+            )
+            .futureValueUS
+          sqlHash shouldBe damlHash
+        }
+      }
+    }
+  }
+
+  /** Exercise a Daml choice and return the Text result. */
+  private def exerciseDaml(op: HashOp)(implicit env: FixtureParam): String = {
+    val (choiceName, choiceArg) = toDamlChoiceAndArg(op, resolveRef)
+    val cmd = new ExerciseCommand(templateId, proxyContractId, choiceName, choiceArg)
+    val tx = sv1Backend.participantClientWithAdminToken.ledger_api_extensions.commands
+      .submitJava(
+        actAs = Seq(svParty),
+        commands = Seq(cmd),
+      )
+    tx.getEventsById.values.asScala
+      .collectFirst { case ex: ExercisedEvent =>
+        ex.getExerciseResult match {
+          case t: Text => t.getValue
+          case other =>
+            throw new IllegalStateException(
+              s"Expected Text result but got ${other.getClass.getSimpleName}"
+            )
+        }
+      }
+      .getOrElse(throw new IllegalStateException("No ExercisedEvent in transaction"))
+  }
+
+  private def resolveRef(ref: HashRef): String = ref match {
+    case Lit(v) => v
+    case IntermediateRef(name) =>
+      intermediates.getOrElse(
+        name,
+        throw new IllegalStateException(s"Intermediate '$name' not found"),
+      )
+  }
+
+  // Progressive map: each test stores its Daml result for later tests to reference
+  private val intermediates: mutable.Map[String, String] = mutable.Map.empty
+
+  private var svParty: PartyId = _
+  private var proxyContractId: String = _
+  private var svDb: DbStorage = _
+
+}
+
+object CryptoHashEquivalenceIntegrationTest {
+
+  // -- Package discovery ------------------------------------------------------
+
+  private val darPath = "daml/splice-amulet-test/.daml/dist/splice-amulet-test-current.dar"
+  private val moduleName = "Splice.Testing.CryptoHashProxy"
+
+  private val packageId: String = {
+    val dar = DarUtil.readDar(new File(darPath))
+    val modName = Ref.ModuleName.assertFromString(moduleName)
+    dar.all
+      .collectFirst { case (pkgId, pkg) if pkg.modules.contains(modName) => pkgId }
+      .getOrElse(sys.error(s"Could not find package containing $moduleName"))
+      .toString
+  }
+
+  private val templateId = new Identifier(packageId, moduleName, "CryptoHashProxy")
+
+  // -- HashRef: symbolic references to intermediate hash values ---------------
+
+  sealed trait HashRef
+  case class Lit(value: String) extends HashRef
+  case class IntermediateRef(name: String) extends HashRef
+
+  // -- HashOp: test case operations (may contain HashRef) ---------------------
+
+  sealed trait HashOp
+  case class HashText(value: String) extends HashOp
+  case class HashList(elems: Seq[HashRef]) extends HashOp
+  case class HashVariant(tag: String, fields: Seq[HashRef]) extends HashOp
+  case class HashMintingAllowance(provider: String, amount: String) extends HashOp
+  case class HashBatchOfMintingAllowances(hashes: Seq[HashRef]) extends HashOp
+  case class HashBatchOfBatches(hashes: Seq[HashRef]) extends HashOp
+
+  case class TestCaseDef(description: String, op: HashOp)
+
+  // -- Derive Daml choice + arg from HashOp ----------------------------------
+
+  private def text(s: String): Value = new Text(s)
+  private def textList(ss: Seq[String]): Value =
+    DamlList.of(ss.map(s => new Text(s): Value).asJava)
+  private def record(fields: (String, Value)*): Value =
+    new DamlRecord(fields.map { case (k, v) => new DamlRecord.Field(k, v) }.asJava)
+
+  def toDamlChoiceAndArg(op: HashOp, r: HashRef => String): (String, Value) = op match {
+    case HashText(v) =>
+      ("CryptoHashProxy_HashText", record("input" -> text(v)))
+    case HashList(elems) =>
+      ("CryptoHashProxy_HashList", record("elems" -> textList(elems.map(r))))
+    case HashVariant(tag, fields) =>
+      (
+        "CryptoHashProxy_HashVariant",
+        record("tag" -> text(tag), "fields" -> textList(fields.map(r))),
+      )
+    case HashMintingAllowance(provider, amount) =>
+      (
+        "CryptoHashProxy_HashMintingAllowance",
+        record("provider" -> text(provider), "amount" -> text(amount)),
+      )
+    case HashBatchOfMintingAllowances(hashes) =>
+      (
+        "CryptoHashProxy_HashBatchOfMintingAllowances",
+        record("allowanceHashes" -> textList(hashes.map(r))),
+      )
+    case HashBatchOfBatches(hashes) =>
+      ("CryptoHashProxy_HashBatchOfBatches", record("childHashes" -> textList(hashes.map(r))))
+  }
+
+  // -- Derive SQL expression from HashOp -------------------------------------
+
+  private def escapeSql(s: String): String = s.replace("'", "''")
+  private def sqlArray(elems: Seq[String]): String =
+    s"ARRAY[${elems.map(e => s"'$e'").mkString(", ")}]::text[]"
+
+  def toSqlExpr(op: HashOp, r: HashRef => String): String = op match {
+    case HashText(v) =>
+      s"daml_crypto_hash_text('${escapeSql(v)}')"
+    case HashList(elems) =>
+      s"daml_crypto_hash_list(${sqlArray(elems.map(r))})"
+    case HashVariant(tag, fields) =>
+      s"daml_crypto_hash_variant('${escapeSql(tag)}', ${sqlArray(fields.map(r))})"
+    case HashMintingAllowance(provider, amount) =>
+      s"hash_minting_allowance('${escapeSql(provider)}', '${escapeSql(amount)}')"
+    case HashBatchOfMintingAllowances(hashes) =>
+      s"hash_batch_of_minting_allowances(${sqlArray(hashes.map(r))})"
+    case HashBatchOfBatches(hashes) =>
+      s"hash_batch_of_batches(${sqlArray(hashes.map(r))})"
+  }
+
+  // -- Test case definitions (fully static) -----------------------------------
+
+  // Test cases are defined statically using HashRef (Lit/IntermediateRef) to
+  // reference intermediate hashes by name. Each test resolves its refs from
+  // a shared map populated progressively as earlier tests run.
+  //
+  // Order matters: intermediates must precede composites that reference them.
+  val allTestCaseDefs: Seq[TestCaseDef] = Seq(
+    // Primitive text hashes — used as intermediates by composite cases
+    TestCaseDef("hAlice", HashText("alice::provider")),
+    TestCaseDef("h10", HashText("10.0")),
+    TestCaseDef("hOnly", HashText("only")),
+    TestCaseDef("h1", HashText("1")),
+    TestCaseDef("hx", HashText("x")),
+
+    // Minting allowance hashes — used as intermediates by batch cases
+    TestCaseDef("maAlice", HashMintingAllowance("alice::provider", "10.0000000000")),
+    TestCaseDef("maBob", HashMintingAllowance("bob::provider", "0")),
+    TestCaseDef("maAlice5", HashMintingAllowance("alice::provider", "5.0")),
+    TestCaseDef("maBob3", HashMintingAllowance("bob::provider", "3.0")),
+    // Batch hashes — used as intermediates by batch-of-batches
+    TestCaseDef("leaf1", HashBatchOfMintingAllowances(Seq(IntermediateRef("maAlice5")))),
+    TestCaseDef("leaf2", HashBatchOfMintingAllowances(Seq(IntermediateRef("maBob3")))),
+
+    // Independent cases (no intermediate references)
+    TestCaseDef("hash of 'hello'", HashText("hello")),
+    TestCaseDef("hash of empty string", HashText("")),
+    TestCaseDef("hashList on empty array", HashList(Seq.empty)),
+
+    // Composite cases using intermediate hashes
+    TestCaseDef(
+      "hashList with two elements",
+      HashList(Seq(IntermediateRef("hAlice"), IntermediateRef("h10"))),
+    ),
+    TestCaseDef("hashList on single element", HashList(Seq(IntermediateRef("hOnly")))),
+    TestCaseDef(
+      "hashVariant with tag and one field",
+      HashVariant("TestTag", Seq(IntermediateRef("hAlice"))),
+    ),
+    TestCaseDef(
+      "hashRecord [hash 1, hash 'x']",
+      HashList(Seq(IntermediateRef("h1"), IntermediateRef("hx"))),
+    ),
+    TestCaseDef(
+      "hashVariant 'V1' [hash 1, hash 'x']",
+      HashVariant("V1", Seq(IntermediateRef("h1"), IntermediateRef("hx"))),
+    ),
+    TestCaseDef(
+      "hash_batch_of_minting_allowances with two",
+      HashBatchOfMintingAllowances(Seq(IntermediateRef("maAlice"), IntermediateRef("maBob"))),
+    ),
+    TestCaseDef(
+      "hash_batch_of_batches with two leaves",
+      HashBatchOfBatches(Seq(IntermediateRef("leaf1"), IntermediateRef("leaf2"))),
+    ),
+  )
+}
diff --git a/apps/common/src/main/resources/db/migration/canton-network/postgres/stable/V065__app_reward_hash_functions.sql b/apps/common/src/main/resources/db/migration/canton-network/postgres/stable/V065__app_reward_hash_functions.sql
new file mode 100644
index 0000000000..fda3f388c9
--- /dev/null
+++ b/apps/common/src/main/resources/db/migration/canton-network/postgres/stable/V065__app_reward_hash_functions.sql
@@ -0,0 +1,72 @@
+-- V065: plpgsql functions for Merkle tree hash computation over app reward batches.
+-- These replicate the Daml CryptoHash module (Splice.Amulet.CryptoHash)
+-- All hash functions return 64-char hex strings (text), matching Daml's Hash type.
+-- Callers that store results in bytea columns (batch_hash, root_hash) must
+-- convert with decode(result, 'hex').
+
+-- ============================================================================
+-- Primitive hash functions matching Daml CryptoHash encoding
+-- ============================================================================
+
+-- Hash a text scalar: sha256(value) → 64-char hex string.
+-- Matches: instance Hashable Text where hash = hashText . id
+CREATE FUNCTION daml_crypto_hash_text(s text) RETURNS text
+  RETURNS NULL ON NULL INPUT
+  AS $$ SELECT encode(extensions.digest(s, 'sha256'), 'hex') $$
+  LANGUAGE sql IMMUTABLE PARALLEL SAFE;
+
+-- Hash a list of already-hashed elements.
+-- Matches: hashListInternal ts = sha256(intercalate "|" (show(length ts) :: ts))
+CREATE FUNCTION daml_crypto_hash_list(elems text[]) RETURNS text
+  RETURNS NULL ON NULL INPUT
+  AS $$
+    SELECT encode(extensions.digest(
+      array_to_string(
+        ARRAY[cardinality(elems)::text] || elems,
+        '|'
+      ),
+      'sha256'
+    ), 'hex')
+  $$ LANGUAGE sql IMMUTABLE PARALLEL SAFE;
+
+-- Hash a variant with a tag and field hashes.
+-- Matches: hashVariant tag fields = sha256(intercalate "|" (tag :: show(length fields) :: map (.value) fields))
+CREATE FUNCTION daml_crypto_hash_variant(tag text, fields text[]) RETURNS text
+  RETURNS NULL ON NULL INPUT
+  AS $$
+    SELECT encode(extensions.digest(
+      array_to_string(
+        ARRAY[tag, cardinality(fields)::text] || fields,
+        '|'
+      ),
+      'sha256'
+    ), 'hex')
+  $$ LANGUAGE sql IMMUTABLE PARALLEL SAFE;
+
+
+-- ============================================================================
+-- Domain-specific hash functions for reward accounting
+-- ============================================================================
+
+-- Hash a single MintingAllowance record.
+-- Matches: hash MintingAllowance{provider, amount} = hashRecord [hash provider, hash amount]
+CREATE FUNCTION hash_minting_allowance(provider text, amount text) RETURNS text
+  RETURNS NULL ON NULL INPUT
+  AS $$ SELECT daml_crypto_hash_list(ARRAY[daml_crypto_hash_text(provider), daml_crypto_hash_text(amount)]) $$
+  LANGUAGE sql IMMUTABLE PARALLEL SAFE;
+
+-- Hash a BatchOfMintingAllowances variant.
+-- Matches: hash (BatchOfMintingAllowances allowances) = hashVariant "BatchOfMintingAllowances" [hash allowances]
+-- where hash allowances = hashList (map hash allowances)
+CREATE FUNCTION hash_batch_of_minting_allowances(allowance_hashes text[]) RETURNS text
+  RETURNS NULL ON NULL INPUT
+  AS $$ SELECT daml_crypto_hash_variant('BatchOfMintingAllowances', ARRAY[daml_crypto_hash_list(allowance_hashes)]) $$
+  LANGUAGE sql IMMUTABLE PARALLEL SAFE;
+
+-- Hash a BatchOfBatches variant.
+-- Matches: hash (BatchOfBatches batchHashes) = hashVariant "BatchOfBatches" [hash batchHashes]
+-- where hash batchHashes = hashList (map hash batchHashes)  (identity on Hash)
+CREATE FUNCTION hash_batch_of_batches(child_hashes text[]) RETURNS text
+  RETURNS NULL ON NULL INPUT
+  AS $$ SELECT daml_crypto_hash_variant('BatchOfBatches', ARRAY[daml_crypto_hash_list(child_hashes)]) $$
+  LANGUAGE sql IMMUTABLE PARALLEL SAFE;
diff --git a/daml/dars.lock b/daml/dars.lock
index 0a78c3c8fc..88e234a941 100644
--- a/daml/dars.lock
+++ b/daml/dars.lock
@@ -35,8 +35,8 @@ splice-amulet-name-service 0.1.6 a208aab2c4a248ab2eff352bd382f8b3bbadc92464123db
 splice-amulet-name-service 0.1.7 ba7806d9b2d593eac74a050161c54ae1325d170bf175cb66a9c1e5e5ffb88c3d
 splice-amulet-name-service 0.1.8 efeb3f9b2b92e55fac4ec2d6164f95407a01477240c7465e576df4e310f54bd3
 splice-amulet-name-service 0.1.9 f1b5915ad45ded616f43f83c735b7ee158b5eb58abe758a721e50eee19b3e531
-splice-amulet-name-service-test 0.1.21 b120f1061b3a4b278badcc27d2ab40bf9f5593a65b92fd1faa568ff02f6eba62
-splice-amulet-test 0.1.20 a9850c98ef59f0550ef7e036d11464bb8b7e97c4b7e88c8a390bbd27e946cca5
+splice-amulet-name-service-test 0.1.22 7be24690bd4b39a76d7245ddfae0c25a2f66c32099e17e856ddb92f5b944bea3
+splice-amulet-test 0.1.21 5657829c3084a8cf5a66c8da180d30aeb5977969e41723e3493ec82830407d17
 splice-api-featured-app-v1 1.0.0 7804375fe5e4c6d5afe067bd314c42fe0b7d005a1300019c73154dd939da4dda
 splice-api-featured-app-v2 1.0.0 dd22e3e168a8c7fd0313171922dabf1f7a3b131bd9bfc9ff98e606f8c57707ea
 splice-api-token-allocation-instruction-v1 1.0.0 275064aacfe99cea72ee0c80563936129563776f67415ef9f13e4297eecbc520
@@ -72,7 +72,7 @@ splice-dso-governance 0.1.6 4e7653cfbf7ca249de4507aca9cd3b91060e5489042a522c589d
 splice-dso-governance 0.1.7 d406eba1132d464605f4dae3edf8cf5ecbbb34bd8edef0e047e7e526d328718c
 splice-dso-governance 0.1.8 1790a114f83d5f290261fae1e7e46fba75a861a3dd603c6b4ef6b67b49053948
 splice-dso-governance 0.1.9 9ee83bfd872f91e659b8a8439c5b4eaf240bcf6f19698f884d7d7993ab48c401
-splice-dso-governance-test 0.1.27 46a2441bd370d21757a4f94fa44ba865f1cddf53ecec0e5a38bff84700977f00
+splice-dso-governance-test 0.1.28 33910e178389129fd916c577fbfd0a58ce86fe33db6a358e7dc988ee2ec014e8
 splice-token-standard-test 1.0.11 b641f7509aff67cdfa82b66ebccfff072b2226b39e5bd998ac118570c926fc50
 splice-token-test-dummy-holding 0.0.1 1cd171c6c42ab46dc9cf12d80c6111369e00cea5cdf054924b4f26ce94b1ef5b
 splice-token-test-dummy-holding 0.0.2 4f40fb033ef3db89623642c1b494e846097fa32af138b3864a63aa15937a323d
@@ -139,7 +139,7 @@ splice-wallet-payments 0.1.6 6124379528eeb6fa17ecdab15577c29abb33d0c0d34dc5f2680
 splice-wallet-payments 0.1.7 4e3e0d9cdadf80f4bf8f3cd3660d5287c084c9a29f23c901aabce597d72fd467
 splice-wallet-payments 0.1.8 e48ea337ee3335c8bb3206a2501ce947ac1a7bdb1825cee8f28bad64f5a7bc4b
 splice-wallet-payments 0.1.9 7f4e081ad96f2ccded0c053b0cf5ddddae1139dfc3bb89cefcf77ea70f2cecb7
-splice-wallet-test 0.1.21 c751f85e42e928f0e300d561bda15be7bb42dd19681a52a4955d839f47f6b695
+splice-wallet-test 0.1.22 9d28b14cc32d128d0d6384eaae90c505f985a0c45d706caca483690b023efe60
 splitwell 0.1.0 075c76de553ab88383a7c69de134afa82aacfdf8ea8fcfe8852c4b199c3b2669
 splitwell 0.1.1 ccb1a0215053062202052e1a052f9214da3fdae5253a6d43e2e155ff4f57fe75
 splitwell 0.1.10 d42676a366f7ca7a2409974dd3054aa4d83ab29baa3b2086ad021407b0a1a295
@@ -159,4 +159,4 @@ splitwell 0.1.6 872da0dd7986fd768930f85d6a7310a94a0ef924e7fbb7bb7a4e149f2b5feb74
 splitwell 0.1.7 841d1c9c86b5c8f3a39059459ecd8febedf7703e18f117300bb0ebf4423db096
 splitwell 0.1.8 63b8153a08ceb4bf40d807acc5712372c3eac548c266be4d5e92470b4f655515
 splitwell 0.1.9 b6267905698d2798b9ef171e27d49fb88e052ec0ec0e0675a3a1b275c7d037d4
-splitwell-test 0.1.21 7cf052802bd7c9f3dcbe7f7af893e595310f7ec98fee05362208cb4808b3b61f
\ No newline at end of file
+splitwell-test 0.1.22 68088430da8cafaa5f8907aacdd4e257d838a6b58a3c1a29eb5555c8145483e4
\ No newline at end of file
diff --git a/daml/splice-amulet-name-service-test/daml.yaml b/daml/splice-amulet-name-service-test/daml.yaml
index d4dfda48ca..22ab8c22be 100644
--- a/daml/splice-amulet-name-service-test/daml.yaml
+++ b/daml/splice-amulet-name-service-test/daml.yaml
@@ -1,7 +1,7 @@
 sdk-version: 3.3.0-snapshot.20250502.13767.0.v2fc6c7e2
 name: splice-amulet-name-service-test
 source: daml
-version: 0.1.21
+version: 0.1.22
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/daml/splice-amulet-test/daml.yaml b/daml/splice-amulet-test/daml.yaml
index c739b84549..a4b7014838 100644
--- a/daml/splice-amulet-test/daml.yaml
+++ b/daml/splice-amulet-test/daml.yaml
@@ -6,7 +6,7 @@
 sdk-version: 3.3.0-snapshot.20250502.13767.0.v2fc6c7e2
 name: splice-amulet-test
 source: daml
-version: 0.1.20
+version: 0.1.21
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/daml/splice-amulet-test/daml/Splice/Testing/CryptoHashProxy.daml b/daml/splice-amulet-test/daml/Splice/Testing/CryptoHashProxy.daml
new file mode 100644
index 0000000000..0c13b83c02
--- /dev/null
+++ b/daml/splice-amulet-test/daml/Splice/Testing/CryptoHashProxy.daml
@@ -0,0 +1,93 @@
+-- Copyright (c) 2024 Digital Asset (Switzerland) GmbH and/or its affiliates. All rights reserved.
+-- SPDX-License-Identifier: Apache-2.0
+
+module Splice.Testing.CryptoHashProxy where
+
+import DA.Text (intercalate, sha256)
+
+-- TODO(#4749): When Splice.Amulet.CryptoHash is merged, remove these
+-- test-only copies and import from the real module instead.
+
+-- | Hash a text scalar: sha256(value).
+-- Matches: instance Hashable Text where hash = hashText . id
+hashText : Text -> Text
+hashText = sha256
+
+-- | Hash a list of already-hashed elements.
+-- Matches: hashListInternal ts = sha256(intercalate "|" (show(length ts) :: ts))
+hashList : [Text] -> Text
+hashList elems =
+  let parts = show (length elems) :: elems
+  in sha256 (intercalate "|" parts)
+
+-- | Hash a variant with a tag and field hashes.
+-- Matches: hashVariant tag fields = sha256(intercalate "|" (tag :: show(length fields) :: fields))
+hashVariant : Text -> [Text] -> Text
+hashVariant tag fieldHashes =
+  let parts = tag :: show (length fieldHashes) :: fieldHashes
+  in sha256 (intercalate "|" parts)
+
+-- | Hash a record as a list of field hashes.
+hashRecord : [Text] -> Text
+hashRecord = hashList
+
+-- | Hash a MintingAllowance{provider, amount}.
+hashMintingAllowance : Text -> Text -> Text
+hashMintingAllowance provider amount =
+  hashRecord [hashText provider, hashText amount]
+
+-- | Hash a BatchOfMintingAllowances variant.
+hashBatchOfMintingAllowances : [Text] -> Text
+hashBatchOfMintingAllowances allowanceHashes =
+  hashVariant "BatchOfMintingAllowances" [hashList allowanceHashes]
+
+-- | Hash a BatchOfBatches variant.
+hashBatchOfBatches : [Text] -> Text
+hashBatchOfBatches childHashes =
+  hashVariant "BatchOfBatches" [hashList childHashes]
+
+-- | Proxy template exposing hash functions as exercisable choices.
+-- Allows Scala integration tests to call Daml hash functions via the
+-- ledger API and compare results to SQL implementations.
+template CryptoHashProxy with
+    owner : Party
+  where
+    signatory owner
+
+    nonconsuming choice CryptoHashProxy_HashText : Text
+      with
+        input : Text
+      controller owner
+      do pure (hashText input)
+
+    nonconsuming choice CryptoHashProxy_HashList : Text
+      with
+        elems : [Text]
+      controller owner
+      do pure (hashList elems)
+
+    nonconsuming choice CryptoHashProxy_HashVariant : Text
+      with
+        tag : Text
+        fields : [Text]
+      controller owner
+      do pure (hashVariant tag fields)
+
+    nonconsuming choice CryptoHashProxy_HashMintingAllowance : Text
+      with
+        provider : Text
+        amount : Text
+      controller owner
+      do pure (hashMintingAllowance provider amount)
+
+    nonconsuming choice CryptoHashProxy_HashBatchOfMintingAllowances : Text
+      with
+        allowanceHashes : [Text]
+      controller owner
+      do pure (hashBatchOfMintingAllowances allowanceHashes)
+
+    nonconsuming choice CryptoHashProxy_HashBatchOfBatches : Text
+      with
+        childHashes : [Text]
+      controller owner
+      do pure (hashBatchOfBatches childHashes)
diff --git a/daml/splice-dso-governance-test/daml.yaml b/daml/splice-dso-governance-test/daml.yaml
index a8bdf68f18..0e0acfcb9f 100644
--- a/daml/splice-dso-governance-test/daml.yaml
+++ b/daml/splice-dso-governance-test/daml.yaml
@@ -1,7 +1,7 @@
 sdk-version: 3.3.0-snapshot.20250502.13767.0.v2fc6c7e2
 name: splice-dso-governance-test
 source: daml
-version: 0.1.27
+version: 0.1.28
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/daml/splice-wallet-test/daml.yaml b/daml/splice-wallet-test/daml.yaml
index 3ea53ca28d..490618978d 100644
--- a/daml/splice-wallet-test/daml.yaml
+++ b/daml/splice-wallet-test/daml.yaml
@@ -1,7 +1,7 @@
 sdk-version: 3.3.0-snapshot.20250502.13767.0.v2fc6c7e2
 name: splice-wallet-test
 source: daml
-version: 0.1.21
+version: 0.1.22
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/daml/splitwell-test/daml.yaml b/daml/splitwell-test/daml.yaml
index 8473a63783..7ef619ce3c 100644
--- a/daml/splitwell-test/daml.yaml
+++ b/daml/splitwell-test/daml.yaml
@@ -1,7 +1,7 @@
 sdk-version: 3.3.0-snapshot.20250502.13767.0.v2fc6c7e2
 name: splitwell-test
 source: daml
-version: 0.1.21
+version: 0.1.22
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/test-full-class-names.log b/test-full-class-names.log
index aaca015258..28e194e112 100644
--- a/test-full-class-names.log
+++ b/test-full-class-names.log
@@ -11,6 +11,7 @@ org.lfdecentralizedtrust.splice.integration.tests.BootstrapPackageConfigDarUploa
 org.lfdecentralizedtrust.splice.integration.tests.BootstrapTest
 org.lfdecentralizedtrust.splice.integration.tests.CombinedDumpDirectoryExportIntegrationTest
 org.lfdecentralizedtrust.splice.integration.tests.ConfigurationProvidedBftScanConnectionIntegrationTest
+org.lfdecentralizedtrust.splice.integration.tests.CryptoHashEquivalenceIntegrationTest
 org.lfdecentralizedtrust.splice.integration.tests.DevelopmentFundCouponIntegrationTest
 org.lfdecentralizedtrust.splice.integration.tests.DirectoryPeriodicBackupIntegrationTest
 org.lfdecentralizedtrust.splice.integration.tests.DistributedDomainIntegrationTest