diff --git a/ethcore/native_contracts/build.rs b/ethcore/native_contracts/build.rs
index 91eaa86cd..0a080e801 100644
--- a/ethcore/native_contracts/build.rs
+++ b/ethcore/native_contracts/build.rs
@@ -22,9 +22,15 @@ use std::io::Write;
 
 // TODO: `include!` these from files where they're pretty-printed?
 const REGISTRY_ABI: &'static str = r#"[{"constant":true,"inputs":[{"name":"_data","type":"address"}],"name":"canReverse","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_new","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_key","type":"string"},{"name":"_value","type":"bytes32"}],"name":"setData","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"string"}],"name":"confirmReverse","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"}],"name":"reserve","outputs":[{"name":"success","type":"bool"}],"payable":true,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"}],"name":"drop","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_key","type":"string"}],"name":"getAddress","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_amount","type":"uint256"}],"name":"setFee","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_to","type":"address"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_key","type":"string"}],"name":"getData","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"reserved","outputs":[{"name":"reserved","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"drain","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"string"},{"name":"_who","type":"address"}],"name":"proposeReverse","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"hasReverse","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_key","type":"string"}],"name":"getUint","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"fee","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"getOwner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_name","type":"bytes32"}],"name":"getReverse","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_data","type":"address"}],"name":"reverse","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_key","type":"string"},{"name":"_value","type":"uint256"}],"name":"setUint","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"string"},{"name":"_who","type":"address"}],"name":"confirmReverseAs","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"removeReverse","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"bytes32"},{"name":"_key","type":"string"},{"name":"_value","type":"address"}],"name":"setAddress","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"}]"#;
+
 const SERVICE_TRANSACTION_ABI: &'static str = r#"[{"constant":false,"inputs":[{"name":"_new","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_who","type":"address"}],"name":"certify","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_who","type":"address"},{"name":"_field","type":"string"}],"name":"getAddress","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_who","type":"address"}],"name":"revoke","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"delegate","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_who","type":"address"},{"name":"_field","type":"string"}],"name":"getUint","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_new","type":"address"}],"name":"setDelegate","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_who","type":"address"}],"name":"certified","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_who","type":"address"},{"name":"_field","type":"string"}],"name":"get","outputs":[{"name":"","type":"bytes32"}],"payable":false,"type":"function"}]"#;
+
 const SECRETSTORE_ACL_STORAGE_ABI: &'static str = r#"[{"constant":true,"inputs":[{"name":"user","type":"address"},{"name":"document","type":"bytes32"}],"name":"checkPermissions","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"}]"#;
 
+const VALIDATOR_SET_ABI: &'static str = r#"[{"constant":true,"inputs":[],"name":"getValidators","outputs":[{"name":"","type":"address[]"}],"payable":false,"type":"function"}]"#;
+
+const VALIDATOR_REPORT_ABI: &'static str = r#"[{"constant":false,"inputs":[{"name":"validator","type":"address"}],"name":"reportMalicious","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"validator","type":"address"}],"name":"reportBenign","outputs":[],"payable":false,"type":"function"}]"#;
+
 fn build_file(name: &str, abi: &str, filename: &str) {
 	let code = ::native_contract_generator::generate_module(name, abi).unwrap();
 
@@ -39,4 +45,6 @@ fn main() {
 	build_file("Registry", REGISTRY_ABI, "registry.rs");
 	build_file("ServiceTransactionChecker", SERVICE_TRANSACTION_ABI, "service_transaction.rs");
 	build_file("SecretStoreAclStorage", SECRETSTORE_ACL_STORAGE_ABI, "secretstore_acl_storage.rs");
+	build_file("ValidatorSet", VALIDATOR_SET_ABI, "validator_set.rs");
+	build_file("ValidatorReport", VALIDATOR_REPORT_ABI, "validator_report.rs");
 }
diff --git a/ethcore/native_contracts/generator/src/lib.rs b/ethcore/native_contracts/generator/src/lib.rs
index f49caf227..363e76ea1 100644
--- a/ethcore/native_contracts/generator/src/lib.rs
+++ b/ethcore/native_contracts/generator/src/lib.rs
@@ -299,10 +299,10 @@ fn detokenize(name: &str, output_type: ParamType) -> String {
 		ParamType::Bool => format!("{}.to_bool()", name),
 		ParamType::String => format!("{}.to_string()", name),
 		ParamType::Array(kind) => {
-			let read_array = format!("x.into_iter().map(|a| {{ {} }}).collect::<Option<Vec<_>>()",
+			let read_array = format!("x.into_iter().map(|a| {{ {} }}).collect::<Option<Vec<_>>>()",
 				detokenize("a", *kind));
 
-			format!("{}.to_array().and_then(|x| {})",
+			format!("{}.to_array().and_then(|x| {{ {} }})",
 				name, read_array)
 		}
 		ParamType::FixedArray(_, _) => panic!("Fixed-length arrays not supported.")
diff --git a/ethcore/native_contracts/src/lib.rs b/ethcore/native_contracts/src/lib.rs
index e894a636f..1aaaf07b1 100644
--- a/ethcore/native_contracts/src/lib.rs
+++ b/ethcore/native_contracts/src/lib.rs
@@ -26,7 +26,11 @@ extern crate ethcore_util as util;
 mod registry;
 mod service_transaction;
 mod secretstore_acl_storage;
+mod validator_set;
+mod validator_report;
 
 pub use self::registry::Registry;
 pub use self::service_transaction::ServiceTransactionChecker;
 pub use self::secretstore_acl_storage::SecretStoreAclStorage;
+pub use self::validator_set::ValidatorSet;
+pub use self::validator_report::ValidatorReport;