diff --git a/README.md b/README.md
index 81f94ec..4f19dbf 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-# anchor-csharp
+# anchor-csharp - BETA
+
+> Warning: This SDK is currently in beta and is subject to change without warning
 
 C# SDK for the KeetaNet anchor. The client logic runs inside a sandboxed WebAssembly core (`keetanetwork_anchor_client_wasi.wasm`, built from [anchor-rs](https://github.com/KeetaNetwork/anchor-rs)) hosted in-process by [Wasmtime](https://github.com/bytecodealliance/wasmtime-dotnet).
 
diff --git a/scripts/pins.env b/scripts/pins.env
index a6ef468..ed4e4db 100644
--- a/scripts/pins.env
+++ b/scripts/pins.env
@@ -3,8 +3,8 @@
 
 # The wasm core (scripts/build-wasm.sh).
 ANCHOR_WASI_CRATE="keetanetwork-anchor-client-wasi"
-ANCHOR_WASI_VERSION="0.2.1"
-ANCHOR_WASI_SHA256="1eeffcc3bff2fa78caf8df7b3774a7bb183c18e52ccaabc969d7c1bcee6e3380"
+ANCHOR_WASI_VERSION="0.2.2"
+ANCHOR_WASI_SHA256="ec7e987bb55b98efca8ad071f983135161d6fd19aec7780ee563674454c1051e"
 
 # The canonical node OpenAPI spec (scripts/generate-node-api.sh).
 NODE_CLIENT_CRATE="keetanetwork-client"
diff --git a/src/KeetaNet.Anchor/Crypto/Account.cs b/src/KeetaNet.Anchor/Crypto/Account.cs
index 7102c3a..588de32 100644
--- a/src/KeetaNet.Anchor/Crypto/Account.cs
+++ b/src/KeetaNet.Anchor/Crypto/Account.cs
@@ -12,7 +12,7 @@ internal Account(WasmRuntime runtime, int handle)
 	}
 
 	/// <summary>The account's textual <c>keeta_...</c> public-key string.</summary>
-	public string PublicKeyString => Runtime.AccountAddress(Handle);
+	public string PublicKeyString => Runtime.AccountPublicKeyString(Handle);
 
 	/// <summary>The account's algorithm name.</summary>
 	public string Algorithm => Runtime.AccountAlgorithm(Handle);
diff --git a/src/KeetaNet.Anchor/Crypto/AccountFactory.cs b/src/KeetaNet.Anchor/Crypto/AccountFactory.cs
index 811e218..96b845d 100644
--- a/src/KeetaNet.Anchor/Crypto/AccountFactory.cs
+++ b/src/KeetaNet.Anchor/Crypto/AccountFactory.cs
@@ -22,7 +22,7 @@ public Account FromSeed(string seed, uint index, string algorithm)
 	/// <summary>Build a read-only account from its textual <c>keeta_...</c> public-key string.</summary>
 	public Account FromPublicKeyString(string publicKeyString)
 	{
-		int handle = _runtime.AccountFromAddress(publicKeyString);
+		int handle = _runtime.AccountFromPublicKeyString(publicKeyString);
 		return new(_runtime, handle);
 	}
 
diff --git a/src/KeetaNet.Anchor/Interop/WasmRuntime.Crypto.cs b/src/KeetaNet.Anchor/Interop/WasmRuntime.Crypto.cs
index 19472a1..6513f5a 100644
--- a/src/KeetaNet.Anchor/Interop/WasmRuntime.Crypto.cs
+++ b/src/KeetaNet.Anchor/Interop/WasmRuntime.Crypto.cs
@@ -13,7 +13,8 @@ public sealed partial class WasmRuntime
 	internal int AccountFromSeed(string seed, uint index, string algorithm) =>
 		DerivedAccount("keeta_account_from_seed", seed, index, algorithm);
 
-	internal int AccountFromAddress(string address) => ParseText("keeta_account_from_address", address);
+	internal int AccountFromPublicKeyString(string publicKeyString) =>
+		ParseText("keeta_account_from_public_key_string", publicKeyString);
 
 	internal int AccountFromPrivateKey(string privateKey, string algorithm) =>
 		AccountFromKeyMaterial("keeta_account_from_private_key", privateKey, algorithm);
@@ -66,7 +67,7 @@ internal byte[] AccountEncrypt(int handle, byte[] plaintext) =>
 	internal byte[] AccountDecrypt(int handle, byte[] ciphertext) =>
 		WithHandleAndBytes("keeta_account_decrypt", handle, ciphertext);
 
-	internal string AccountAddress(int handle) => TextOf("keeta_account_address", handle);
+	internal string AccountPublicKeyString(int handle) => TextOf("keeta_account_public_key_string", handle);
 
 	internal string AccountAlgorithm(int handle) => TextOf("keeta_account_algorithm", handle);
 
diff --git a/src/KeetaNet.Anchor/Interop/WasmRuntime.cs b/src/KeetaNet.Anchor/Interop/WasmRuntime.cs
index 601b0c2..df54872 100644
--- a/src/KeetaNet.Anchor/Interop/WasmRuntime.cs
+++ b/src/KeetaNet.Anchor/Interop/WasmRuntime.cs
@@ -552,7 +552,11 @@ private byte[] ReadAndFreeBytes(int handle)
 		}
 	}
 
-	/// <summary>Build an exception from the module's pending <c>code</c>/<c>message</c>.</summary>
+	/// <summary>
+	/// Build an exception from the module's pending <c>code</c>/<c>message</c>.
+	/// An asset-movement blocker code carries the blocker as JSON in the
+	/// message, surfaced typed as a <see cref="KeetaBlockerException"/>.
+	/// </summary>
 	private KeetaException LastError()
 	{
 		string code = ReadErrorPart(_lastErrorCode());
@@ -567,7 +571,7 @@ private KeetaException LastError()
 			message = "operation failed";
 		}
 
-		return new KeetaException(code, message);
+		return KeetaBlockerException.TryDecode(code, message) ?? new KeetaException(code, message);
 	}
 
 	/// <summary>Read one optional last-error part (an empty string when absent).</summary>
diff --git a/src/KeetaNet.Anchor/KeetaException.cs b/src/KeetaNet.Anchor/KeetaException.cs
index e90a950..dab52d8 100644
--- a/src/KeetaNet.Anchor/KeetaException.cs
+++ b/src/KeetaNet.Anchor/KeetaException.cs
@@ -2,9 +2,11 @@ namespace KeetaNet.Anchor;
 
 /// <summary>
 /// A failure surfaced from the SDK (the wasm core or the node transport): a
-/// programmatic <see cref="Code"/> plus a human-readable message.
+/// programmatic <see cref="Code"/> plus a human-readable message. Failures
+/// that carry a typed payload derive from it, such as
+/// <see cref="KeetaBlockerException"/>.
 /// </summary>
-public sealed class KeetaException : Exception
+public class KeetaException : Exception
 {
 	/// <summary>The stable, machine-readable error code.</summary>
 	public string Code { get; }
diff --git a/src/KeetaNet.Anchor/Services/AssetMovement/AssetMovementClient.cs b/src/KeetaNet.Anchor/Services/AssetMovement/AssetMovementClient.cs
index f6456a0..2d963cc 100644
--- a/src/KeetaNet.Anchor/Services/AssetMovement/AssetMovementClient.cs
+++ b/src/KeetaNet.Anchor/Services/AssetMovement/AssetMovementClient.cs
@@ -80,8 +80,7 @@ public async Task<IReadOnlyList<AssetProvider>> GetProvidersForTransfer(
 
 	/// <summary>
 	/// The provider's advertised legal disclaimers, or null when its metadata
-	/// carries none. Malformed entries are skipped, mirroring the reference
-	/// <c>getLegalDisclaimers</c>.
+	/// carries none. Malformed entries are skipped.
 	/// </summary>
 	public IReadOnlyList<AssetDisclaimer>? GetLegalDisclaimers(AssetProvider provider)
 	{
diff --git a/src/KeetaNet.Anchor/Services/AssetMovement/KeetaBlockerException.cs b/src/KeetaNet.Anchor/Services/AssetMovement/KeetaBlockerException.cs
new file mode 100644
index 0000000..6074af9
--- /dev/null
+++ b/src/KeetaNet.Anchor/Services/AssetMovement/KeetaBlockerException.cs
@@ -0,0 +1,66 @@
+using System.Text.Json;
+
+namespace KeetaNet.Anchor;
+
+/// <summary>
+/// An anchor refusal carrying a typed asset-movement blocker: the operation
+/// cannot proceed until the user resolves <see cref="Blocker"/>.
+/// </summary>
+public sealed class KeetaBlockerException : KeetaException
+{
+	/// <summary>Every recognized blocker transport code starts with this.</summary>
+	internal const string CodePrefix = "KEETA_ANCHOR_ASSET_MOVEMENT_";
+
+	/// <summary>The typed blocker the user must resolve.</summary>
+	public AssetMovementBlocker Blocker { get; }
+
+	private KeetaBlockerException(string code, string message, AssetMovementBlocker blocker)
+		: base(code, message)
+	{
+		Blocker = blocker;
+	}
+
+	/// <summary>
+	/// Rehydrate a blocker failure from the core's last-error parts, or null
+	/// when <paramref name="code"/> is not a blocker transport code or
+	/// <paramref name="payload"/> does not decode as a recognized blocker.
+	/// </summary>
+	internal static KeetaBlockerException? TryDecode(string code, string payload)
+	{
+		if (!code.StartsWith(CodePrefix, StringComparison.Ordinal))
+		{
+			return null;
+		}
+
+		AssetMovementBlocker? blocker;
+		try
+		{
+			blocker = JsonSerializer.Deserialize<AssetMovementBlocker>(payload, KeetaJson.Options);
+		}
+		catch (JsonException)
+		{
+			return null;
+		}
+
+		if (blocker is null || Describe(blocker) is not { } summary)
+		{
+			return null;
+		}
+
+		return new KeetaBlockerException(code, summary, blocker);
+	}
+
+	/// <summary>
+	/// A human-readable summary of what the user must resolve, or null for a
+	/// shape that does not surface typed.
+	/// </summary>
+	private static string? Describe(AssetMovementBlocker blocker) =>
+		blocker switch
+		{
+			AssetKycShareNeededBlocker => "the provider requires KYC attributes to be shared first",
+			AssetAdditionalKycNeededBlocker => "the provider requires additional KYC steps",
+			AssetOperationNotSupportedBlocker => "the provider does not support this operation",
+			AssetUserActionNeededBlocker => "the provider requires on-ledger user actions",
+			_ => null,
+		};
+}
diff --git a/tests/KeetaNet.Anchor.E2eTests/AssetFlowTests.cs b/tests/KeetaNet.Anchor.E2eTests/AssetFlowTests.cs
index 9866cb0..885618b 100644
--- a/tests/KeetaNet.Anchor.E2eTests/AssetFlowTests.cs
+++ b/tests/KeetaNet.Anchor.E2eTests/AssetFlowTests.cs
@@ -287,6 +287,25 @@ await Assert.ThrowsAsync<KeetaException>(
 		session.Shutdown();
 	}
 
+	[Fact]
+	public async Task ARefusedShareSurfacesTheTypedKycBlocker()
+	{
+		using var session = AssetSession.Open();
+		(AssetMovementClient client, AssetAnchor anchor, CancellationToken cancellationToken) = session;
+		AssetProvider provider = await session.DiscoveredProviderAsync();
+
+		// The anchor refuses the magic attributes with a 403 blocker envelope
+		KeetaBlockerException refusal = await Assert.ThrowsAsync<KeetaBlockerException>(
+			() => client.ShareKycAttributes(provider, new AssetShareKycRequest("blocked"), cancellationToken));
+
+		Assert.Equal("KEETA_ANCHOR_ASSET_MOVEMENT_KYC_SHARE_NEEDED", refusal.Code);
+		var share = Assert.IsType<AssetKycShareNeededBlocker>(refusal.Blocker);
+		Assert.Equal(BlockedAttributes, share.NeededAttributes);
+		Assert.Equal(new[] { anchor.SendToAddress }, share.ShareWithPrincipals);
+
+		session.Shutdown();
+	}
+
 	/// <summary>A push transfer moving the base token from the EVM location to Keeta.</summary>
 	private static AssetTransferRequest PushTransfer(AssetAnchor anchor, object? recipient) =>
 		new(
diff --git a/tests/KeetaNet.Anchor.Tests/AssetModelTests.cs b/tests/KeetaNet.Anchor.Tests/AssetModelTests.cs
index 86830bd..b8e2b6a 100644
--- a/tests/KeetaNet.Anchor.Tests/AssetModelTests.cs
+++ b/tests/KeetaNet.Anchor.Tests/AssetModelTests.cs
@@ -5,7 +5,7 @@
 namespace KeetaNet.Anchor.Tests;
 
 /// <summary>
-/// The offline asset-movement model surface: typed blocker decoding from the
+/// Asset-movement model surface: typed blocker decoding from the
 /// core's discriminated account-status shape, typed disclaimer and token
 /// metadata reads, and the canonical asset transport form.
 /// </summary>
@@ -82,8 +82,7 @@ public void LegalDisclaimersDecodeAndSkipMalformedEntries()
 		using Account account = runtime.Accounts.FromSeed(TestSeeds.Subject, 0, TestSeeds.DefaultAlgorithm);
 		using AssetMovementClient client = runtime.CreateAssetMovementClient(TestSeeds.NonRoutableAnchor, account.PublicKeyString, account);
 
-		// One well-formed markdown disclaimer and one with an unknown purpose;
-		// the malformed entry is skipped, mirroring the reference.
+		// One well-formed markdown disclaimer and one with an unknown purpose
 		AssetProvider provider = Provider(legal: """
 		{
 			"disclaimers": [
diff --git a/tests/KeetaNet.Anchor.Tests/BlockerExceptionTests.cs b/tests/KeetaNet.Anchor.Tests/BlockerExceptionTests.cs
new file mode 100644
index 0000000..896c640
--- /dev/null
+++ b/tests/KeetaNet.Anchor.Tests/BlockerExceptionTests.cs
@@ -0,0 +1,48 @@
+using Xunit;
+
+namespace KeetaNet.Anchor.Tests;
+
+/// <summary>
+/// The blocker-exception decode contract at the core error boundary: every
+/// recognized blocker payload rehydrates typed, and anything else falls back
+/// to the plain failure path so a newer core never breaks an older binding.
+/// </summary>
+public sealed class BlockerExceptionTests
+{
+	private const string ShareCode = "KEETA_ANCHOR_ASSET_MOVEMENT_KYC_SHARE_NEEDED";
+
+	[Theory]
+	[InlineData(
+		"""{"type":"kycShareNeeded","tosFlow":null,"neededAttributes":["fullName"],"shareWithPrincipals":["keeta_p"],"acceptedIssuers":[]}""",
+		typeof(AssetKycShareNeededBlocker))]
+	[InlineData(
+		"""{"type":"additionalKycNeeded","toCompleteFlow":null}""",
+		typeof(AssetAdditionalKycNeededBlocker))]
+	[InlineData(
+		"""{"type":"operationNotSupported","forAsset":"asset","forRail":"ACH_DEBIT"}""",
+		typeof(AssetOperationNotSupportedBlocker))]
+	[InlineData(
+		"""{"type":"userActionNeeded","actionsNeeded":[]}""",
+		typeof(AssetUserActionNeededBlocker))]
+	public void ARecognizedPayloadDecodesToItsTypedBlocker(string payload, Type blockerType)
+	{
+		KeetaBlockerException? decoded = KeetaBlockerException.TryDecode(ShareCode, payload);
+
+		Assert.NotNull(decoded);
+		Assert.Equal(ShareCode, decoded!.Code);
+		Assert.IsType(blockerType, decoded.Blocker);
+	}
+
+	// A non-blocker code, a blocker type this binding does not know (a newer
+	// core), an unrecognized "other" shape, a non-JSON message, and a JSON
+	// null must all fall back to the plain failure path instead of throwing
+	// out of the decoder.
+	[Theory]
+	[InlineData("SERVICE", """{"type":"kycShareNeeded"}""")]
+	[InlineData("KEETA_ANCHOR_ASSET_MOVEMENT_SOMETHING_NEW", """{"type":"somethingNew"}""")]
+	[InlineData(ShareCode, """{"type":"other","name":"SomeError","code":"SOMETHING_ELSE","message":"boom"}""")]
+	[InlineData(ShareCode, "not json at all")]
+	[InlineData(ShareCode, "null")]
+	public void AnUnrecognizedPayloadFallsBackToAPlainFailure(string code, string payload) =>
+		Assert.Null(KeetaBlockerException.TryDecode(code, payload));
+}
diff --git a/tests/KeetaNet.Anchor.Tests/KycModelTests.cs b/tests/KeetaNet.Anchor.Tests/KycModelTests.cs
index c6897af..998f509 100644
--- a/tests/KeetaNet.Anchor.Tests/KycModelTests.cs
+++ b/tests/KeetaNet.Anchor.Tests/KycModelTests.cs
@@ -3,8 +3,7 @@
 namespace KeetaNet.Anchor.Tests;
 
 /// <summary>
-/// The offline KYC model folds, mirroring the reference
-/// <c>getSupportedCountries</c> aggregation cases.
+/// KYC model fold
 /// </summary>
 public sealed class KycModelTests
 {
diff --git a/tests/node-harness/src/asset.ts b/tests/node-harness/src/asset.ts
index eca07e5..04ce91c 100644
--- a/tests/node-harness/src/asset.ts
+++ b/tests/node-harness/src/asset.ts
@@ -335,6 +335,19 @@ function assetCallbacks(baseTokenAccount: TokenAccount, sendToAccount: SigningAc
 		},
 
 		shareKYC: async function(request) {
+			/*
+			 * A magic attributes string exercises the refusal path: the anchor
+			 * throws the typed KYC-share-needed error, which the server
+			 * serializes into a 403 blocker envelope for a binding to decode.
+			 */
+			if (request.attributes.includes('blocked')) {
+				throw(new assetCommon.Errors.KYCShareNeeded({
+					neededAttributes: ['fullName', 'dateOfBirth'],
+					shareWithPrincipals: [sendToAccount],
+					acceptedIssuers: [[{ name: 'CN', value: 'Anchor Test CA' }]]
+				}));
+			}
+
 			/*
 			 * A magic attributes string exercises the pending path: the anchor
 			 * reports the share pending and hands back a root-relative promise