diff --git a/src/components/modules/did/hooks/useDidStellar.ts b/src/components/modules/did/hooks/useDidStellar.ts
index 4be9f74..198c254 100644
--- a/src/components/modules/did/hooks/useDidStellar.ts
+++ b/src/components/modules/did/hooks/useDidStellar.ts
@@ -16,6 +16,7 @@ import {
 import { StrKey } from '@stellar/stellar-sdk';
 import { useWalletContext } from '@/providers/wallet.provider';
 import { useNetwork } from '@/providers/network.provider';
+import { getDidRegistryContractId, getStellarRpcUrl } from '@/lib/didStellar';
 
 const didClient = new ActaDidClient({ baseUrl: 'https://did.acta.build' });
 
@@ -79,6 +80,10 @@ export function useDidStellar() {
       const prepared = await prepareRegisterDidXdr({
         did,
         sourcePublicKey: walletAddress,
+        // Pin the registry + RPC per network so registration never depends on
+        // the published SDK's built-in defaults (which may lag a deployment).
+        registryContractId: getDidRegistryContractId(stellarNetwork),
+        rpcUrl: getStellarRpcUrl(stellarNetwork),
         record: {
           controller: walletAddress,
           authentication: [{ publicKeyMultibase }],
diff --git a/src/lib/didStellar.ts b/src/lib/didStellar.ts
index 70f40b5..ff6e7ef 100644
--- a/src/lib/didStellar.ts
+++ b/src/lib/didStellar.ts
@@ -1,3 +1,53 @@
+type DidNetwork = 'testnet' | 'mainnet';
+
+/**
+ * Canonical `did-stellar-registry` contract IDs per network.
+ *
+ * The SDK ships its own defaults, but the published `@acta-team/did-stellar`
+ * may lag behind a new deployment, so the dApp passes these explicitly to the
+ * prepare helpers (the same way it pins the ACTA API base URL per network).
+ * Keep these in sync with `contracts-acta/docs/deployments/{network}.md` and
+ * with the registry that `did.acta.build` resolves against for each network:
+ *   - testnet: did-stellar-registry v0.1.0
+ *   - mainnet: did-stellar-registry v0.2.0
+ */
+const DEFAULT_DID_REGISTRY_CONTRACT_ID: Record<DidNetwork, string> = {
+  testnet: 'CB7ATU7SF5QUKJMSULJDJVWJZVDXC23HTZX6NFUDTSFPVT6MA575NNZJ',
+  mainnet: 'CD6LSWW5ZSXOO5WAIHKQLQ262TW7BPI37PNEVMMA273BAPC65NN2AYXQ',
+};
+
+const DEFAULT_STELLAR_RPC_URL: Record<DidNetwork, string> = {
+  testnet: 'https://soroban-testnet.stellar.org',
+  mainnet: 'https://mainnet.sorobanrpc.com',
+};
+
+function asDidNetwork(network: string): DidNetwork {
+  return network === 'mainnet' ? 'mainnet' : 'testnet';
+}
+
+/** Registry contract ID for `network`, overridable per network via env. */
+export function getDidRegistryContractId(network: string): string {
+  const net = asDidNetwork(network);
+  const envValue =
+    net === 'mainnet'
+      ? process.env.NEXT_PUBLIC_DID_REGISTRY_CONTRACT_ID_MAINNET
+      : process.env.NEXT_PUBLIC_DID_REGISTRY_CONTRACT_ID_TESTNET;
+  if (envValue && typeof envValue === 'string' && envValue.trim()) return envValue.trim();
+  return DEFAULT_DID_REGISTRY_CONTRACT_ID[net];
+}
+
+/** Soroban RPC URL for `network`, overridable per network via env. */
+export function getStellarRpcUrl(network: string): string {
+  const net = asDidNetwork(network);
+  const envValue =
+    net === 'mainnet'
+      ? process.env.NEXT_PUBLIC_STELLAR_RPC_URL_MAINNET
+      : process.env.NEXT_PUBLIC_STELLAR_RPC_URL_TESTNET;
+  if (envValue && typeof envValue === 'string' && envValue.trim())
+    return envValue.trim().replace(/\/$/, '');
+  return DEFAULT_STELLAR_RPC_URL[net];
+}
+
 /**
  * Reads the user's registered did:stellar DID from localStorage.
  * Returns null if no DID has been created yet.