diff --git a/.github/workflows/rust-fmt-lint.yaml b/.github/workflows/rust-fmt-lint.yaml
index 455bcae6..fecb2138 100644
--- a/.github/workflows/rust-fmt-lint.yaml
+++ b/.github/workflows/rust-fmt-lint.yaml
@@ -16,8 +16,8 @@ env:
   RUST_CLIPPY: 1.67
 
 jobs:
-  "lint_fmt":
-    name: lint:fmt
+  lint_fmt:
+    name: Running formatting
     # Don't run on draft pull requests
     if: ${{ !github.event.pull_request.draft }}
     runs-on: ubuntu-latest
@@ -27,6 +27,7 @@ jobs:
           - gallery/verifier/Cargo.toml
           - sponsoredTransactions/backend/Cargo.toml
           - sponsoredTransactionsAuction/backend/Cargo.toml
+          - trackAndTrace/smart-contract/Cargo.toml
 
     steps:
       - name: Checkout
@@ -44,9 +45,9 @@ jobs:
           command: fmt
           args: --manifest-path=${{ matrix.crates }} -- --check
 
-  "lint_clippy":
-    name: lint:clippy
-    needs: "lint_fmt"
+  lint_clippy:
+    name: Running clippy
+    needs: lint_fmt
     # Don't run on draft pull requests
     if: ${{ !github.event.pull_request.draft }}
     runs-on: ubuntu-latest
@@ -56,6 +57,7 @@ jobs:
           - gallery/verifier/Cargo.toml
           - sponsoredTransactions/backend/Cargo.toml
           - sponsoredTransactionsAuction/backend/Cargo.toml
+          - trackAndTrace/smart-contract/Cargo.toml
 
     steps:
       - name: Checkout
@@ -75,3 +77,37 @@ jobs:
         with:
           command: clippy
           args: --manifest-path ${{ matrix.crates }} -- -D warnings
+
+    test:
+    name: Running tests
+    runs-on: ubuntu-latest
+    needs: [lint_fmt, lint_clippy]
+    strategy:
+      matrix:
+        target:
+          - x86_64-unknown-linux-gnu
+
+        lib-crates:
+          - trackAndTrace/smart-contract/Cargo.toml
+
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ env.RUST_VERSION }}
+          target: ${{ matrix.target }}
+          override: true
+
+      - name: Run cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          # Run all tests, including doc tests.
+          args: --manifest-path ${{ matrix.lib-crates }} --target=${{ matrix.target }}
+
diff --git a/.gitignore b/.gitignore
index ba85f606..010e9558 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@ yarn-debug.log*
 yarn-error.log*
 
 target
+/**/concordium-out
 dist
 gallery/public
 .eslintcache
diff --git a/trackAndTrace/README.md b/trackAndTrace/README.md
new file mode 100644
index 00000000..c2a56e9d
--- /dev/null
+++ b/trackAndTrace/README.md
@@ -0,0 +1 @@
+## Track and Trace Project
\ No newline at end of file
diff --git a/trackAndTrace/rustfmt.toml b/trackAndTrace/rustfmt.toml
new file mode 100644
index 00000000..812265ff
--- /dev/null
+++ b/trackAndTrace/rustfmt.toml
@@ -0,0 +1,21 @@
+edition = "2021"
+combine_control_expr = false
+wrap_comments = true
+brace_style = "PreferSameLine"
+enum_discrim_align_threshold = 20
+fn_single_line = true
+format_strings = true
+format_macro_matchers = true
+format_macro_bodies = true
+imports_granularity = "Crate"
+normalize_comments = true
+reorder_impl_items = true
+reorder_imports = true
+struct_field_align_threshold = 20
+trailing_semicolon = true
+type_punctuation_density = "Wide"
+use_field_init_shorthand = true
+use_try_shorthand = true
+format_code_in_doc_comments = true
+overflow_delimited_expr = true
+normalize_doc_attributes = true
diff --git a/trackAndTrace/smart-contract/Cargo.lock b/trackAndTrace/smart-contract/Cargo.lock
new file mode 100644
index 00000000..504bc28d
--- /dev/null
+++ b/trackAndTrace/smart-contract/Cargo.lock
@@ -0,0 +1,2750 @@
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diff --git a/trackAndTrace/smart-contract/Cargo.toml b/trackAndTrace/smart-contract/Cargo.toml
new file mode 100644
index 00000000..4655da33
--- /dev/null
+++ b/trackAndTrace/smart-contract/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "track-and-trace"
+version = "0.1.0"
+authors = ["Concordium <developers@concordium.com>"]
+edition = "2021"
+license = "MPL-2.0"
+description = "A smart contract for tracking and tracing items on a supply chain."
+
+[features]
+default = ["std", "wee_alloc"]
+std = ["concordium-std/std", "concordium-cis2/std"]
+wee_alloc = ["concordium-std/wee_alloc"]
+
+[dependencies]
+concordium-std = { version = "9.0", default-features = false }
+concordium-cis2 = { version = "6.0", default-features = false }
+
+[dev-dependencies]
+concordium-smart-contract-testing = { version = "4.0" }
+
+[lib]
+crate-type=["cdylib", "rlib"]
+
+[profile.release]
+codegen-units = 1
+opt-level = "s"
+
diff --git a/trackAndTrace/smart-contract/README.md b/trackAndTrace/smart-contract/README.md
new file mode 100644
index 00000000..5e876f6d
--- /dev/null
+++ b/trackAndTrace/smart-contract/README.md
@@ -0,0 +1,31 @@
+# Track and Trace smart contract
+
+## Prerequisites
+
+`cargo/rustup` and `cargo-concordium` needs to be [set up](https://developer.concordium.software/en/mainnet/smart-contracts/guides/quick-start.html).
+
+## Build
+
+Run the following command to compile the smart contract into the wasm module `module.wasm.v1` with embedded schema:
+
+```bash
+cargo concordium build --schema-embed --out concordium-out/module.wasm.v1
+```
+
+### Building for deployment
+
+When building for deployment, the `--verifiable` option for `cargo concordium build` should be utilized:
+
+```bash
+cargo concordium build --schema-embed --out concordium-out/module.wasm.v1 --verifiable docker.io/concordium/verifiable-sc:1.70.0
+```
+
+Documentation on using verifiable builds is available [here](https://docs.rs/crate/cargo-concordium/latest).
+
+## Test
+
+Run the following command to run the unit and integration tests:
+
+```bash
+cargo concordium test --out concordium-out/module.wasm.v1
+```
diff --git a/trackAndTrace/smart-contract/src/lib.rs b/trackAndTrace/smart-contract/src/lib.rs
new file mode 100644
index 00000000..f9c0e508
--- /dev/null
+++ b/trackAndTrace/smart-contract/src/lib.rs
@@ -0,0 +1,698 @@
+//! # Implementation of a simple track-and-trace contract.
+//!
+//! ## Grant and Revoke roles:
+//! The contract has access control roles. The available roles are ADMIN (can
+//! grant/revoke roles, create a new item, and update the status of an item),
+//! PRODUCER (can update the status of an item from `Produced` to `InTransit`),
+//! TRANSPORTER (can update the status of an item from `InTransit` to
+//! `InStore`), and SELLER (can update the status of an item from `InStore` to
+//! `Sold`). Several addresses can have the same role and an address can have
+//! several roles.
+//!
+//! ## State machine:
+//! The track-and-trace contract is modeled based on a state machine. The flow
+//! of the state machine is as follows: The ADMIN creates a new item with status
+//! `Produced`. Each new item is assigned the `next_item_id`. The `next_item_id`
+//! value is sequentially increased by 1 in the contract's state. The different
+//! roles can update the item's status based on the rules of the state machine
+//! as follows: Produced -> InTransit -> InStore -> Sold. The ADMIN role is an
+//! exception and can set an item's status to any value at any time ignoring the
+//! state machine rules.
+#![cfg_attr(not(feature = "std"), no_std)]
+use concordium_cis2::*;
+use concordium_std::{collections::BTreeMap, *};
+
+/// Event tags.
+pub const ITEM_CREATED_EVENT_TAG: u8 = 0;
+pub const ITEM_STATUS_CHANGED_EVENT_TAG: u8 = 1;
+pub const GRANT_ROLE_EVENT_TAG: u8 = 2;
+pub const REVOKE_ROLE_EVENT_TAG: u8 = 3;
+
+/// Custom type for the item id.
+type ItemID = u64;
+
+/// Tagged events to be serialized for the event log.
+#[derive(Debug, Serial, Deserial, PartialEq, Eq)]
+pub enum Event {
+    /// The event tracks when an item is created.
+    ItemCreated(ItemCreatedEvent),
+    /// The event tracks when the item's status is updated.
+    ItemStatusChanged(ItemStatusChangedEvent),
+    /// The event tracks when a new role is granted to an address.
+    GrantRole(GrantRoleEvent),
+    /// The event tracks when a role is revoked from an address.
+    RevokeRole(RevokeRoleEvent),
+}
+
+/// The ItemCreatedEvent is logged when an item is created.
+#[derive(Serialize, SchemaType, Debug, PartialEq, Eq)]
+pub struct ItemCreatedEvent {
+    /// The item's id.
+    pub item_id:      ItemID,
+    /// The item's metadata_url.
+    pub metadata_url: Option<MetadataUrl>,
+}
+
+/// The ItemStatusChangedEvent is logged when the status of an item is updated.
+#[derive(Serialize, SchemaType, Debug, PartialEq, Eq)]
+pub struct ItemStatusChangedEvent {
+    /// The item's id.
+    pub item_id:         ItemID,
+    /// The item's new status.
+    pub new_status:      Status,
+    /// Any additional data encoded as generic bytes. Usecase-specific data can
+    /// be included here such as temperature, longitude, latitude, ... .
+    pub additional_data: AdditionalData,
+}
+
+/// The GrantRoleEvent is logged when a new role is granted to an address.
+#[derive(Serialize, SchemaType, Debug, PartialEq, Eq)]
+pub struct GrantRoleEvent {
+    /// The address that has been its role granted.
+    pub address: Address,
+    /// The role that was granted to the above address.
+    pub role:    Roles,
+}
+
+/// The RevokeRoleEvent is logged when a role is revoked from an address.
+#[derive(Serialize, SchemaType, Debug, PartialEq, Eq)]
+pub struct RevokeRoleEvent {
+    /// Address that has been its role revoked.
+    pub address: Address,
+    /// The role that was revoked from the above address.
+    pub role:    Roles,
+}
+
+/// A struct containing a set of roles granted to an address.
+#[derive(Serial, DeserialWithState, Deletable)]
+#[concordium(state_parameter = "S")]
+struct AddressRoleState<S> {
+    /// Set of roles.
+    roles: StateSet<Roles, S>,
+}
+
+/// Enum of available roles in this contract. Several addresses can have the
+/// same role and an address can have several roles.
+#[derive(Serialize, PartialEq, Eq, Reject, SchemaType, Clone, Copy, Debug)]
+pub enum Roles {
+    /// Admin role.
+    ADMIN,
+    /// Producer role.
+    PRODUCER,
+    /// Transporter role.
+    TRANSPORTER,
+    /// Seller role.
+    SELLER,
+}
+
+/// Enum of the statuses that an item can have.
+#[derive(Serialize, PartialEq, Eq, Reject, SchemaType, Clone, Copy, Debug)]
+pub enum Status {
+    /// Item is produced.
+    Produced,
+    /// Item is in transit.
+    InTransit,
+    /// Item is in store.
+    InStore,
+    /// Item is sold.
+    Sold,
+}
+
+impl Status {
+    fn new() -> Self { Status::Produced }
+}
+
+// Implementing a custom schemaType for the `Event` struct containing all
+// events. This custom implementation flattens the fields to avoid one
+// level of nesting. Deriving the schemaType would result in e.g.: {"Nonce":
+// [{...fields}] }. In contrast, this custom schemaType implementation results
+// in e.g.: {"Nonce": {...fields} }
+impl schema::SchemaType for Event {
+    fn get_type() -> schema::Type {
+        let mut event_map = BTreeMap::new();
+        event_map.insert(
+            ITEM_CREATED_EVENT_TAG,
+            (
+                "ItemCreated".to_string(),
+                schema::Fields::Named(vec![
+                    (String::from("itemId"), ItemID::get_type()),
+                    (
+                        String::from("metadataURL"),
+                        Option::<MetadataUrl>::get_type(),
+                    ),
+                ]),
+            ),
+        );
+        event_map.insert(
+            ITEM_STATUS_CHANGED_EVENT_TAG,
+            (
+                "ItemStatusChanged".to_string(),
+                schema::Fields::Named(vec![
+                    (String::from("itemId"), ItemID::get_type()),
+                    (String::from("newStatus"), Status::get_type()),
+                    (String::from("additionalData"), AdditionalData::get_type()),
+                ]),
+            ),
+        );
+        event_map.insert(
+            GRANT_ROLE_EVENT_TAG,
+            (
+                "GrantRole".to_string(),
+                schema::Fields::Named(vec![
+                    (String::from("address"), Address::get_type()),
+                    (String::from("role"), Roles::get_type()),
+                ]),
+            ),
+        );
+        event_map.insert(
+            REVOKE_ROLE_EVENT_TAG,
+            (
+                "RevokeRole".to_string(),
+                schema::Fields::Named(vec![
+                    (String::from("address"), Address::get_type()),
+                    (String::from("role"), Roles::get_type()),
+                ]),
+            ),
+        );
+        schema::Type::TaggedEnum(event_map)
+    }
+}
+
+/// A struct containing a state of one item.
+#[derive(Debug, Serialize, SchemaType, Clone, PartialEq, Eq)]
+pub struct ItemState {
+    /// The status of the item.
+    pub status:       Status,
+    /// The metadata_url of the item.
+    pub metadata_url: Option<MetadataUrl>,
+}
+
+/// The state of the smart contract.
+/// This state can be viewed by querying the node with the command
+/// `concordium-client contract invoke` using the `view` function as entrypoint.
+#[derive(Serial, DeserialWithState)]
+#[concordium(state_parameter = "S")]
+struct State<S = StateApi> {
+    /// The next item id that will be assigned to an item when the admin creates
+    /// it. This value is sequentially increased by 1.
+    next_item_id: ItemID,
+    /// A map containing all roles granted to addresses.
+    roles:        StateMap<Address, AddressRoleState<S>, S>,
+    /// A map containing all items with their states.
+    items:        StateMap<ItemID, ItemState, S>,
+}
+
+/// The different errors the contract can produce.
+#[derive(Serialize, Debug, PartialEq, Eq, Reject, SchemaType)]
+pub enum CustomContractError {
+    /// Failed parsing the parameter.
+    #[from(ParseError)]
+    ParseParams, // -1
+    /// Failed logging because the log is full.
+    LogFull, // -2
+    /// Failed logging because the log is malformed.
+    LogMalformed, // -3
+    /// Failed because the actor is not authorized to invoke the entry point.
+    Unauthorized, // -4
+    /// Failed to revoke role because it was not granted in the first place.
+    RoleWasNotGranted, // -5
+    /// Failed to grant role because it was granted already in the first place.
+    RoleWasAlreadyGranted, // -6
+    /// Item with given item id already exists in the state.
+    ItemAlreadyExists, // -7
+    /// Item with given item id does not exist in the state.
+    ItemDoesNotExist, // -8
+    /// The item is already in the final state and cannot be updated based on
+    /// the state machine rules.
+    FinalState, // -9
+}
+
+/// Mapping the logging errors to CustomContractError.
+impl From<LogError> for CustomContractError {
+    fn from(le: LogError) -> Self {
+        match le {
+            LogError::Full => Self::LogFull,
+            LogError::Malformed => Self::LogMalformed,
+        }
+    }
+}
+
+/// Custom type for the contract result.
+pub type ContractResult<A> = Result<A, CustomContractError>;
+
+impl State {
+    /// Grant role to an address.
+    fn grant_role(&mut self, account: &Address, role: Roles, state_builder: &mut StateBuilder) {
+        self.roles
+            .entry(*account)
+            .or_insert_with(|| AddressRoleState {
+                roles: state_builder.new_set(),
+            });
+
+        self.roles.entry(*account).and_modify(|entry| {
+            entry.roles.insert(role);
+        });
+    }
+
+    /// Revoke role from an address.
+    fn revoke_role(&mut self, account: &Address, role: Roles) {
+        self.roles.entry(*account).and_modify(|entry| {
+            entry.roles.remove(&role);
+        });
+    }
+
+    /// Check if an address has a role.
+    fn has_role(&self, account: &Address, role: Roles) -> bool {
+        return match self.roles.get(account) {
+            None => false,
+            Some(roles) => roles.roles.contains(&role),
+        };
+    }
+
+    /// Change the item status to the given new status. The function reverts if
+    /// the item does not exist.
+    fn change_item_status(
+        &mut self,
+        item_index: ItemID,
+        new_state: Status,
+    ) -> Result<(), CustomContractError> {
+        let mut previous_state = self
+            .items
+            .entry(item_index)
+            .occupied_or(CustomContractError::ItemDoesNotExist)?;
+
+        previous_state.status = new_state;
+
+        Ok(())
+    }
+}
+
+/// Init function that creates a new contract.
+#[init(contract = "track_and_trace", event = "Event", enable_logger)]
+fn init(
+    ctx: &InitContext,
+    state_builder: &mut StateBuilder,
+    logger: &mut impl HasLogger,
+) -> InitResult<State> {
+    // Get the instantiater of this contract instance.
+    let invoker = Address::Account(ctx.init_origin());
+
+    // Creating `State`
+    let mut state = State {
+        next_item_id: 0u64,
+        roles:        state_builder.new_map(),
+        items:        state_builder.new_map(),
+    };
+
+    // Grant ADMIN role.
+    state.grant_role(&invoker, Roles::ADMIN, state_builder);
+    logger.log(&Event::GrantRole(GrantRoleEvent {
+        address: invoker,
+        role:    Roles::ADMIN,
+    }))?;
+
+    Ok(state)
+}
+
+/// Return_value of the `view` function contains the content of the state.
+#[derive(Serialize, SchemaType, PartialEq, Eq, Debug)]
+pub struct ViewState {
+    /// The next item id that will be assigned to an item when the admin creates
+    /// it.
+    pub next_item_id: ItemID,
+    /// A vector containing all roles granted to addresses.
+    pub roles:        Vec<(Address, Vec<Roles>)>,
+    /// A vector containing all items with their states.
+    pub items:        Vec<(ItemID, ItemState)>,
+}
+
+/// View function for testing. This function reports on the entire state of the
+/// contract for testing purposes.
+#[receive(
+    contract = "track_and_trace",
+    name = "view",
+    return_value = "ViewState"
+)]
+fn contract_view(_ctx: &ReceiveContext, host: &Host<State>) -> ReceiveResult<ViewState> {
+    let state = host.state();
+
+    let roles: Vec<(Address, Vec<Roles>)> = state
+        .roles
+        .iter()
+        .map(|(key, value)| {
+            let mut roles_vec = Vec::new();
+            for role in value.roles.iter() {
+                roles_vec.push(*role);
+            }
+            (*key, roles_vec)
+        })
+        .collect();
+
+    let items: Vec<(ItemID, ItemState)> = state
+        .items
+        .iter()
+        .map(|(key, value)| (*key, (*value).clone()))
+        .collect();
+
+    Ok(ViewState {
+        roles,
+        items,
+        next_item_id: state.next_item_id,
+    })
+}
+
+/// Receive function for the ADMIN to create a new item.
+///
+/// It rejects if:
+/// - It fails to parse the parameter.
+/// - The sender is not the ADMIN of the contract instance.
+/// - The item already exists in the state which should technically not happen.
+/// - It fails to log the `ItemCreatedEvent`.
+#[receive(
+    contract = "track_and_trace",
+    name = "createItem",
+    parameter = "Option<MetadataUrl>",
+    error = "CustomContractError",
+    mutable,
+    enable_logger
+)]
+fn create_item(
+    ctx: &ReceiveContext,
+    host: &mut Host<State>,
+    logger: &mut impl HasLogger,
+) -> Result<(), CustomContractError> {
+    // Parse the parameter.
+    let metadata_url: Option<MetadataUrl> = ctx.parameter_cursor().get()?;
+
+    // Check that only the ADMIN is authorized to create a new item.
+    ensure!(
+        host.state().has_role(&ctx.sender(), Roles::ADMIN),
+        CustomContractError::Unauthorized
+    );
+
+    // Get the next available item id.
+    let next_item_id = host.state().next_item_id;
+    // Increase the item id tracker in the state.
+    host.state_mut().next_item_id += 1;
+
+    // Create the item in state.
+    let previous_item = host.state_mut().items.insert(next_item_id, ItemState {
+        metadata_url: metadata_url.clone(),
+        status:       Status::new(),
+    });
+
+    ensure_eq!(previous_item, None, CustomContractError::ItemAlreadyExists);
+
+    // Log an ItemCreatedEvent.
+    logger.log(&Event::ItemCreated(ItemCreatedEvent {
+        item_id: next_item_id,
+        metadata_url,
+    }))?;
+
+    Ok(())
+}
+
+/// Partial parameter type for the contract function
+/// `changeItemStatus/changeItemStatusByAdmin`.
+#[derive(Serialize, SchemaType, Debug, PartialEq, Eq)]
+pub struct AdditionalData {
+    /// Any additional data encoded as generic bytes. Usecase-specific data can
+    /// be included here such as temperature, longitude, latitude, ... .
+    pub bytes: Vec<u8>,
+}
+
+/// The parameter type for the contract function `changeItemStatusByAdmin` which
+/// updates the status of an item.
+#[derive(Serialize, SchemaType)]
+pub struct ChangeItemStatusParamsByAdmin {
+    /// The item's id.
+    pub item_id:         ItemID,
+    /// The item's new status.
+    pub new_status:      Status,
+    /// Any additional data encoded as generic bytes. Usecase-specific data can
+    /// be included here such as temperature, longitude, latitude, ... .
+    pub additional_data: AdditionalData,
+}
+
+/// Receive function for the ADMIN to change the
+/// status of an item. The ADMIN can set the item's status
+/// to any value at any time.
+///
+/// It rejects if:
+/// - It fails to parse the parameter.
+/// - Sender is not an authorized role.
+/// - The item does not exist in the state.
+/// - It fails to log the `ItemStatusChangedEvent`.
+#[receive(
+    contract = "track_and_trace",
+    name = "changeItemStatusByAdmin",
+    parameter = "ChangeItemStatusParamsByAdmin",
+    error = "CustomContractError",
+    mutable,
+    enable_logger
+)]
+fn change_item_status_by_admin(
+    ctx: &ReceiveContext,
+    host: &mut Host<State>,
+    logger: &mut impl HasLogger,
+) -> Result<(), CustomContractError> {
+    // Parse the parameter.
+    let param: ChangeItemStatusParamsByAdmin = ctx.parameter_cursor().get()?;
+
+    // Check that only the ADMIN is authorized.
+    ensure!(
+        host.state().has_role(&ctx.sender(), Roles::ADMIN),
+        CustomContractError::Unauthorized
+    );
+
+    // The admin can set the item's status to any value at any time.
+    host.state_mut()
+        .change_item_status(param.item_id, param.new_status)?;
+
+    // Log an ItemStatusChangedEvent.
+    logger.log(&Event::ItemStatusChanged(ItemStatusChangedEvent {
+        item_id:         param.item_id,
+        new_status:      param.new_status,
+        additional_data: param.additional_data,
+    }))?;
+
+    Ok(())
+}
+
+/// The parameter type for the contract function `changeItemStatus` which
+/// updates the status of an item.
+#[derive(Serialize, SchemaType)]
+pub struct ChangeItemStatusParams {
+    /// The item's id.
+    pub item_id:         ItemID,
+    /// Any additional data encoded as generic bytes. Usecase-specific data can
+    /// be included here such as temperature, longitude, latitude, ... .
+    pub additional_data: AdditionalData,
+}
+
+/// Function to update the item's status based on the rules of the state
+/// machine.
+fn update_state_machine(
+    host: &mut Host<State>,
+    sender: Address,
+    item_id: ItemID,
+) -> Result<Status, CustomContractError> {
+    // Get the item from the state.
+    let mut item = host
+        .state_mut()
+        .items
+        .entry(item_id)
+        .occupied_or(CustomContractError::ItemDoesNotExist)?;
+
+    // Model the state transition based on the rules of the state machine.
+    match item.status {
+        Status::Produced => {
+            item.status = Status::InTransit;
+            drop(item);
+
+            // Check that only the correct role is authorized.
+            ensure!(
+                host.state().has_role(&sender, Roles::PRODUCER),
+                CustomContractError::Unauthorized
+            );
+            Ok(Status::InTransit)
+        }
+        Status::InTransit => {
+            item.status = Status::InStore;
+            drop(item);
+
+            // Check that only the correct role is authorized.
+            ensure!(
+                host.state().has_role(&sender, Roles::TRANSPORTER),
+                CustomContractError::Unauthorized
+            );
+            Ok(Status::InStore)
+        }
+        Status::InStore => {
+            item.status = Status::Sold;
+            drop(item);
+
+            // Check that only the correct role is authorized.
+            ensure!(
+                host.state().has_role(&sender, Roles::SELLER),
+                CustomContractError::Unauthorized
+            );
+            Ok(Status::Sold)
+        }
+        Status::Sold => bail!(CustomContractError::FinalState),
+    }
+}
+
+/// Receive function for the other ROLES (all roles except for the ADMIN role)
+/// to change the status of an item. The other ROLES can update the item's
+/// status based on the rules of the state machine.
+///
+/// It rejects if:
+/// - It fails to parse the parameter.
+/// - Sender is not an authorized role to update the item to the next state.
+/// - The item does not exist in the state.
+/// - The item is already in the `Sold` state (final state).
+/// - It fails to log the `ItemStatusChangedEvent`.
+#[receive(
+    contract = "track_and_trace",
+    name = "changeItemStatus",
+    parameter = "ChangeItemStatusParams",
+    error = "CustomContractError",
+    mutable,
+    enable_logger
+)]
+fn change_item_status(
+    ctx: &ReceiveContext,
+    host: &mut Host<State>,
+    logger: &mut impl HasLogger,
+) -> Result<(), CustomContractError> {
+    // Parse the parameter.
+    let param: ChangeItemStatusParams = ctx.parameter_cursor().get()?;
+
+    let new_status = update_state_machine(host, ctx.sender(), param.item_id)?;
+
+    // Log an ItemStatusChangedEvent.
+    logger.log(&Event::ItemStatusChanged(ItemStatusChangedEvent {
+        item_id: param.item_id,
+        new_status,
+        additional_data: param.additional_data,
+    }))?;
+
+    Ok(())
+}
+
+/// The parameter for the contract function `grantRole` which grants a role to
+/// an address.
+#[derive(Serialize, SchemaType)]
+pub struct GrantRoleParams {
+    /// The address that has been its role granted.
+    pub address: Address,
+    /// The role that has been granted to the above address.
+    pub role:    Roles,
+}
+
+/// Add role to an address.
+///
+/// It rejects if:
+/// - It fails to parse the parameter.
+/// - The sender is not the ADMIN of the contract instance.
+/// - The `address` is already holding the specified role to be granted.
+#[receive(
+    contract = "track_and_trace",
+    name = "grantRole",
+    parameter = "GrantRoleParams",
+    error = "CustomContractError",
+    enable_logger,
+    mutable
+)]
+fn contract_grant_role(
+    ctx: &ReceiveContext,
+    host: &mut Host<State>,
+    logger: &mut impl HasLogger,
+) -> ContractResult<()> {
+    // Parse the parameter.
+    let params: GrantRoleParams = ctx.parameter_cursor().get()?;
+
+    let (state, state_builder) = host.state_and_builder();
+
+    // Get the sender who invoked this contract function.
+    let sender = ctx.sender();
+    // Check that only the ADMIN is authorized to grant roles.
+    ensure!(
+        state.has_role(&sender, Roles::ADMIN),
+        CustomContractError::Unauthorized
+    );
+
+    // Check that the `address` had previously not held the specified role.
+    ensure!(
+        !state.has_role(&params.address, params.role),
+        CustomContractError::RoleWasAlreadyGranted
+    );
+
+    // Grant role.
+    state.grant_role(&params.address, params.role, state_builder);
+    // Log a GrantRoleEvent.
+    logger.log(&Event::GrantRole(GrantRoleEvent {
+        address: params.address,
+        role:    params.role,
+    }))?;
+    Ok(())
+}
+
+/// The parameter for the contract function `revokeRole` which revokes a role
+/// from an address.
+#[derive(Serialize, SchemaType)]
+pub struct RevokeRoleParams {
+    /// The address that has been its role revoked.
+    pub address: Address,
+    /// The role that has been revoked from the above address.
+    pub role:    Roles,
+}
+
+/// Revoke role from an address.
+///
+/// It rejects if:
+/// - It fails to parse the parameter.
+/// - The sender is not the ADMIN of the contract instance.
+/// - The `address` does not hold the specified role to be revoked.
+#[receive(
+    contract = "track_and_trace",
+    name = "revokeRole",
+    parameter = "RevokeRoleParams",
+    error = "CustomContractError",
+    enable_logger,
+    mutable
+)]
+fn contract_revoke_role(
+    ctx: &ReceiveContext,
+    host: &mut Host<State>,
+    logger: &mut impl HasLogger,
+) -> ContractResult<()> {
+    // Parse the parameter.
+    let params: RevokeRoleParams = ctx.parameter_cursor().get()?;
+
+    let (state, _) = host.state_and_builder();
+
+    // Get the sender who invoked this contract function.
+    let sender = ctx.sender();
+    // Check that only the ADMIN is authorized to revoke roles.
+    ensure!(
+        state.has_role(&sender, Roles::ADMIN),
+        CustomContractError::Unauthorized
+    );
+
+    // Check that the `address` had previously held the specified role.
+    ensure!(
+        state.has_role(&params.address, params.role),
+        CustomContractError::RoleWasNotGranted
+    );
+
+    // Revoke role.
+    state.revoke_role(&params.address, params.role);
+    // Log a RevokeRoleEvent.
+    logger.log(&Event::RevokeRole(RevokeRoleEvent {
+        address: params.address,
+        role:    params.role,
+    }))?;
+    Ok(())
+}
diff --git a/trackAndTrace/smart-contract/tests/tests.rs b/trackAndTrace/smart-contract/tests/tests.rs
new file mode 100644
index 00000000..8c4c4288
--- /dev/null
+++ b/trackAndTrace/smart-contract/tests/tests.rs
@@ -0,0 +1,330 @@
+//! Tests for the track_and_trace smart contract.
+use concordium_smart_contract_testing::*;
+use concordium_std::MetadataUrl;
+use track_and_trace::*;
+
+/// The test accounts.
+const ADMIN: AccountAddress = AccountAddress([0; 32]);
+const ADMIN_ADDR: Address = Address::Account(AccountAddress([0; 32]));
+const PRODUCER: AccountAddress = AccountAddress([1; 32]);
+const PRODUCER_ADDR: Address = Address::Account(AccountAddress([1; 32]));
+const TRANSPORTER: AccountAddress = AccountAddress([2; 32]);
+const TRANSPORTER_ADDR: Address = Address::Account(AccountAddress([2; 32]));
+const SELLER: AccountAddress = AccountAddress([3; 32]);
+const SELLER_ADDR: Address = Address::Account(AccountAddress([3; 32]));
+
+const SIGNER: Signer = Signer::with_one_key();
+const ACC_INITIAL_BALANCE: Amount = Amount::from_ccd(10000);
+
+// 1. Test that the ADMIN can create a new item.
+// 2. Test that the PRODUCER can update the item status to `InTransit`.
+// 3. Test that the SELLER can NOT update the item status to `InStore`.
+// 4. Test that the ADMIN can update the item status to `Sold`. The ADMIN can
+// update the item to any state, neglecting the rules of the state machine.
+#[test]
+fn test_create_item_and_update_item_status() {
+    let (mut chain, track_and_trace_contract_address) = initialize_chain_and_contract();
+
+    // Create the Parameter.
+    let metadata_url = Some(MetadataUrl {
+        url:  "https://some.example/".to_string(),
+        hash: None,
+    });
+
+    // Check the ADMIN can create a new item.
+    let update = chain
+        .contract_update(
+            SIGNER,
+            ADMIN,
+            ADMIN_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::from_ccd(0),
+                address:      track_and_trace_contract_address,
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.createItem".to_string(),
+                ),
+                message:      OwnedParameter::from_serial(&metadata_url)
+                    .expect("Serialize parameter"),
+            },
+        )
+        .expect("Should be able to create item");
+
+    // Check that the events are logged.
+    let events = update
+        .events()
+        .flat_map(|(_addr, events)| events.iter().map(|e| e.parse().expect("Deserialize event")))
+        .collect::<Vec<Event>>();
+
+    assert_eq!(events, [Event::ItemCreated(ItemCreatedEvent {
+        item_id:      0u64,
+        metadata_url: metadata_url.clone(),
+    })]);
+
+    // Check contract state.
+    check_state(
+        &chain,
+        track_and_trace_contract_address,
+        Status::Produced,
+        metadata_url.clone(),
+    );
+
+    let parameter = ChangeItemStatusParams {
+        item_id:         0u64,
+        additional_data: AdditionalData { bytes: vec![] },
+    };
+
+    // Check the PRODUCER can update the item based on the state machine rules.
+    let update = chain
+        .contract_update(
+            SIGNER,
+            PRODUCER,
+            PRODUCER_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::from_ccd(0),
+                address:      track_and_trace_contract_address,
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.changeItemStatus".to_string(),
+                ),
+                message:      OwnedParameter::from_serial(&parameter).expect("Serialize parameter"),
+            },
+        )
+        .expect("Should be able update the state of the item");
+
+    // Check that the events are logged.
+    let events = update
+        .events()
+        .flat_map(|(_addr, events)| events.iter().map(|e| e.parse().expect("Deserialize event")))
+        .collect::<Vec<Event>>();
+
+    assert_eq!(events, [Event::ItemStatusChanged(ItemStatusChangedEvent {
+        item_id:         parameter.item_id,
+        new_status:      Status::InTransit,
+        additional_data: parameter.additional_data,
+    })]);
+
+    // Check contract state.
+    check_state(
+        &chain,
+        track_and_trace_contract_address,
+        Status::InTransit,
+        metadata_url.clone(),
+    );
+
+    let parameter = ChangeItemStatusParams {
+        item_id:         0u64,
+        additional_data: AdditionalData { bytes: vec![] },
+    };
+
+    // Check the SELLER can NOT update the item because of the rules of the state
+    // machine.
+    let update = chain
+        .contract_update(
+            SIGNER,
+            SELLER,
+            SELLER_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::from_ccd(0),
+                address:      track_and_trace_contract_address,
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.changeItemStatus".to_string(),
+                ),
+                message:      OwnedParameter::from_serial(&parameter).expect("Serialize parameter"),
+            },
+        )
+        .expect_err("Should expect error");
+
+    // Check that the correct error is returned.
+    let error: CustomContractError = update
+        .parse_return_value()
+        .expect("CustomContractError return value");
+    assert_eq!(error, CustomContractError::Unauthorized);
+
+    let parameter = ChangeItemStatusParamsByAdmin {
+        item_id:         0u64,
+        new_status:      Status::Sold,
+        additional_data: AdditionalData { bytes: vec![] },
+    };
+
+    // Check the ADMIN can update the item to any state.
+    let update = chain
+        .contract_update(
+            SIGNER,
+            ADMIN,
+            ADMIN_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::from_ccd(0),
+                address:      track_and_trace_contract_address,
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.changeItemStatusByAdmin".to_string(),
+                ),
+                message:      OwnedParameter::from_serial(&parameter).expect("Serialize parameter"),
+            },
+        )
+        .expect("Should be able to update the state of the item");
+
+    // Check that the events are logged.
+    let events = update
+        .events()
+        .flat_map(|(_addr, events)| events.iter().map(|e| e.parse().expect("Deserialize event")))
+        .collect::<Vec<Event>>();
+
+    assert_eq!(events, [Event::ItemStatusChanged(ItemStatusChangedEvent {
+        item_id:         parameter.item_id,
+        new_status:      parameter.new_status,
+        additional_data: parameter.additional_data,
+    })]);
+
+    // Check contract state.
+    check_state(
+        &chain,
+        track_and_trace_contract_address,
+        parameter.new_status,
+        metadata_url,
+    );
+}
+
+// Invoke the `view` function and check that the contract state is as expected.
+// Exactly one item is expected to be in the state.
+fn check_state(
+    chain: &Chain,
+    track_and_trace_contract_address: ContractAddress,
+    status: Status,
+    metadata_url: Option<MetadataUrl>,
+) {
+    let invoke = chain
+        .contract_invoke(
+            ADMIN,
+            ADMIN_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::zero(),
+                receive_name: OwnedReceiveName::new_unchecked("track_and_trace.view".to_string()),
+                address:      track_and_trace_contract_address,
+                message:      OwnedParameter::empty(),
+            },
+        )
+        .expect("Invoke view");
+
+    let return_value: ViewState = invoke.parse_return_value().expect("ViewState return value");
+
+    // Check that the status of the item is correct.
+    assert_eq!(return_value, ViewState {
+        next_item_id: 1,
+        roles:        vec![
+            (ADMIN_ADDR, vec![Roles::ADMIN]),
+            (PRODUCER_ADDR, vec![Roles::PRODUCER]),
+            (TRANSPORTER_ADDR, vec![Roles::TRANSPORTER]),
+            (SELLER_ADDR, vec![Roles::SELLER]),
+        ],
+        items:        vec![(0, ItemState {
+            status,
+            metadata_url
+        })],
+    });
+}
+
+/// Setup chain and contract.
+fn initialize_chain_and_contract() -> (Chain, ContractAddress) {
+    let mut chain = Chain::builder()
+        .build()
+        .expect("Should be able to build chain");
+
+    // Create some accounts on the chain.
+    chain.create_account(Account::new(ADMIN, ACC_INITIAL_BALANCE));
+    chain.create_account(Account::new(PRODUCER, ACC_INITIAL_BALANCE));
+    chain.create_account(Account::new(TRANSPORTER, ACC_INITIAL_BALANCE));
+    chain.create_account(Account::new(SELLER, ACC_INITIAL_BALANCE));
+
+    // Load and deploy the track_and_trace module.
+    let module = module_load_v1("./concordium-out/module.wasm.v1").expect("Module exists");
+    let deployment = chain
+        .module_deploy_v1(SIGNER, ADMIN, module)
+        .expect("Deploy valid module");
+
+    // Initialize the track_and_trace contract.
+    let track_and_trace = chain
+        .contract_init(SIGNER, ADMIN, Energy::from(10000), InitContractPayload {
+            amount:    Amount::zero(),
+            mod_ref:   deployment.module_reference,
+            init_name: OwnedContractName::new_unchecked("init_track_and_trace".to_string()),
+            param:     OwnedParameter::empty(),
+        })
+        .expect("Initialize track_and_trace contract");
+
+    // Grant PRODUCER role
+    let grant_role_params = GrantRoleParams {
+        address: PRODUCER_ADDR,
+        role:    Roles::PRODUCER,
+    };
+
+    let _update = chain
+        .contract_update(
+            SIGNER,
+            ADMIN,
+            ADMIN_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::zero(),
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.grantRole".to_string(),
+                ),
+                address:      track_and_trace.contract_address,
+                message:      OwnedParameter::from_serial(&grant_role_params)
+                    .expect("GrantRole params"),
+            },
+        )
+        .expect("PRODUCER should be granted role");
+
+    // Grant TRANSPORTER role
+    let grant_role_params = GrantRoleParams {
+        address: TRANSPORTER_ADDR,
+        role:    Roles::TRANSPORTER,
+    };
+
+    let _update = chain
+        .contract_update(
+            SIGNER,
+            ADMIN,
+            ADMIN_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::zero(),
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.grantRole".to_string(),
+                ),
+                address:      track_and_trace.contract_address,
+                message:      OwnedParameter::from_serial(&grant_role_params)
+                    .expect("GrantRole params"),
+            },
+        )
+        .expect("TRANSPORTER should be granted role");
+
+    // Grant SELLER role
+    let grant_role_params = GrantRoleParams {
+        address: SELLER_ADDR,
+        role:    Roles::SELLER,
+    };
+
+    let _update = chain
+        .contract_update(
+            SIGNER,
+            ADMIN,
+            ADMIN_ADDR,
+            Energy::from(10000),
+            UpdateContractPayload {
+                amount:       Amount::zero(),
+                receive_name: OwnedReceiveName::new_unchecked(
+                    "track_and_trace.grantRole".to_string(),
+                ),
+                address:      track_and_trace.contract_address,
+                message:      OwnedParameter::from_serial(&grant_role_params)
+                    .expect("GrantRole params"),
+            },
+        )
+        .expect("SELLER should be granted role");
+    (chain, track_and_trace.contract_address)
+}