fix: added endpoint to get the genesis block hash

ChangeLog.md

@@ -2,6 +2,10 @@
 
 ## [unreleased]
 
+## [0.45.0] - 2026-02-23
+
+- Add `GET` endpoint `/v0/genesisHash` for getting the genesis block hash for the connected network.
+
 ## [0.44.2] - 2026-01-28
 
 - Revise `cost`/`subtotal`/`total` display for sponsored transactions.

README.md

@@ -52,6 +52,7 @@ cooldowns and the available balance) and get the info if an account is on any al
 * `GET /v0/plt/tokenInfo/{tokenId}`: get info about a given plt token and its module state (with metadata url).
 * `GET /v0/keyAccounts/{public key}`: get accounts associated with a given public key. Optionally filter the result for simple accounts.
 * `POST /v0/transakOnRamp`: create a URL to initiate purchasing CCDs through the Transak on-ramp.
+* `GET /v0/genesisHash`: get the genesis block hash for the connected network.
 
 ### Errors
 
@@ -1482,6 +1483,20 @@ does not behave in the expected manner or times out.  (The proxy will time out a
 Note: per [Transak's documentation](https://docs.transak.com/reference/create-widget-url), the `widgetUrl` is valid only for 5 minutes from the time of creation.
 
 
+
+## Genesis block hash
+
+A GET request to `/v0/genesisHash` returns the genesis block hash for the connected network.
+
+Example response:
+
+```json
+{
+  "genesis_block":"853288fa5a45554d3cbbf8a756b85abcbfddf28e752b13223eb747209a4d0d3c"
+}
+```
+
+
 # Deployment
 
 The wallet proxy must have access to

package.yaml

@@ -1,5 +1,5 @@
 name:                wallet-proxy
-version:             0.44.2
+version:             0.45.0
 github:              "Concordium/concordium-wallet-proxy"
 author:              "Concordium"
 maintainer:          "developers@concordium.com"

src/Proxy.hs

@@ -323,6 +323,7 @@ mkYesod
 /v0/plt/tokenInfo/#Text PltTokenInfoR GET
 /v0/keyAccounts/#Text KeyAccounts GET
 /v0/transakOnRamp TransakOnRamp POST
+/v0/genesisHash GenesisHash GET
 |]
 
 instance Yesod Proxy where
@@ -2971,6 +2972,13 @@ getPltTokenInfoR tokenId =
     runGRPC (getTokenInfoFromText tokenId LastFinal) $ \tokenInfo -> do
         sendResponse $ toJSON tokenInfo
 
+-- | Returns the genesis block hash for the connected network.
+getGenesisHash :: Handler TypedContent
+getGenesisHash =
+    runGRPC getConsensusInfo $ \cInfo -> do
+        let genesisBlock = object ["genesis_block" .= csGenesisBlock cInfo]
+        sendResponse $ toJSON genesisBlock
+
 -- | Create a Transak on-ramp session. This requires an "address" parameter to be specified, which
 --  will be the address of the account to which the purchased funds will be sent.
 postTransakOnRamp :: Handler TypedContent