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diff --git a/Collapse file: build/contracts/EthereumDIDRegistry.json
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diff --git a/Collapse file: contracts/EthereumDIDRegistry.sol
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@@ -40,10 +40,10 @@ let didReg = DidReg.at(DidRegistryContract.networks[networkId].address)
 ## Contract Deployments
 |Network|Address|
 | --|--|
-|Mainnet (id: 1)|[0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275](https://etherscan.io/address/0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275)|
-|Ropsten (id: 3)|[0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275](https://ropsten.etherscan.io/address/0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275)|
-|Rinkeby (id: 4)|[0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275](https://rinkeby.etherscan.io/address/0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275)|
-|Kovan (id: 42)|[0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275](https://kovan.etherscan.io/address/0x160c5ce58e2cc4fe7cc45a9dd569a10083b2a275)|
+|Mainnet (id: 1)|[0xdca7ef03e98e0dc2b855be647c39abe984fcf21b](https://etherscan.io/address/0xdca7ef03e98e0dc2b855be647c39abe984fcf21b)|
+|Ropsten (id: 3)|[0xdca7ef03e98e0dc2b855be647c39abe984fcf21b](https://ropsten.etherscan.io/address/0xdca7ef03e98e0dc2b855be647c39abe984fcf21b)|
+|Rinkeby (id: 4)|[0xdca7ef03e98e0dc2b855be647c39abe984fcf21b](https://rinkeby.etherscan.io/address/0xdca7ef03e98e0dc2b855be647c39abe984fcf21b)|
+|Kovan (id: 42)|[0xdca7ef03e98e0dc2b855be647c39abe984fcf21b](https://kovan.etherscan.io/address/0xdca7ef03e98e0dc2b855be647c39abe984fcf21b)|
 
 ## On-chain vs Off-chain
 For on-chain interactions Ethereum has a built in account abstraction that can be used regardless of whether the account is a smart contract or a key pair. Any transaction has a `msg.sender` as the verified send of the transaction.
@@ -98,15 +98,6 @@ Validity is set using amount of seconds from the time that adding the delegate i
 ### Looking up a delegate
 You can check if an address is a delegate for an identity using the`validDelegate(address identity, string delegateType, address delegate) returns(bool)` function. This returns true if the address is a valid delegate of the given delegateType.
 
-### Checking a delegate signature
-The registry provides a handy function for checking an externally signed signature in your own contracts and validating it is a particular kind of delegate. 
-
-This frees you from adding nonce and signature management code in your  own contracts.
-
-`validDelegateSignature(address identity, string delegateType, uint8 sigV, bytes32 sigR, bytes32 sigS, bytes32 hash) public returns(address)`
-
-In your own code you will need to calculate the hash yourself.
-
 ### Adding a delegate
 
 An identity can assign multiple delegates to manage signing on their behalf for specific purposes.
 
@@ -20,23 +20,20 @@ contract EthereumDIDRegistry {
 
   event DIDDelegateChanged(
     address indexed identity,
-    string delegateType,
+    bytes32 delegateType,
     address delegate,
     uint validTo,
     uint previousChange
   );
 
   event DIDAttributeChanged(
     address indexed identity,
-    string name,
+    bytes32 name,
     bytes value,
     uint validTo,
     uint previousChange
   );
 
-  function EthereumDIDRegistry() public {
-  }
-
   function identityOwner(address identity) public view returns(address) {
      address owner = owners[identity];
      if (owner != 0x0) {
@@ -52,21 +49,14 @@ contract EthereumDIDRegistry {
     return signer;
   }
 
-  function validDelegate(address identity, string delegateType, address delegate) public view returns(bool) {
+  function validDelegate(address identity, bytes32 delegateType, address delegate) public view returns(bool) {
     uint validity = delegates[identity][keccak256(delegateType)][delegate];
-    return (validity >= block.timestamp);
-  }
-
-  function validDelegateSignature(address identity, string delegateType, uint8 sigV, bytes32 sigR, bytes32 sigS, bytes32 hash) public returns(address) {
-    address signer = ecrecover(hash, sigV, sigR, sigS);
-    require(validDelegate(identity, delegateType, signer));
-    nonce[signer]++;
-    return signer;
+    return (validity > now);
   }
 
   function changeOwner(address identity, address actor, address newOwner) internal onlyOwner(identity, actor) {
     owners[identity] = newOwner;
-    DIDOwnerChanged(identity, newOwner, changed[identity]);
+    emit DIDOwnerChanged(identity, newOwner, changed[identity]);
     changed[identity] = block.number;
   }
 
@@ -75,64 +65,64 @@ contract EthereumDIDRegistry {
   }
 
   function changeOwnerSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, address newOwner) public {
-    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identityOwner(identity)], identity, "changeOwner", newOwner); 
+    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identityOwner(identity)], identity, "changeOwner", newOwner);
     changeOwner(identity, checkSignature(identity, sigV, sigR, sigS, hash), newOwner);
   }
 
-  function addDelegate(address identity, address actor, string delegateType, address delegate, uint validity ) internal onlyOwner(identity, actor) {
-    delegates[identity][keccak256(delegateType)][delegate] = block.timestamp + validity;
-    DIDDelegateChanged(identity, delegateType, delegate, block.timestamp + validity, changed[identity]);
+  function addDelegate(address identity, address actor, bytes32 delegateType, address delegate, uint validity) internal onlyOwner(identity, actor) {
+    delegates[identity][keccak256(delegateType)][delegate] = now + validity;
+    emit DIDDelegateChanged(identity, delegateType, delegate, now + validity, changed[identity]);
     changed[identity] = block.number;
   }
 
-  function addDelegate(address identity, string delegateType, address delegate, uint validity) public {
+  function addDelegate(address identity, bytes32 delegateType, address delegate, uint validity) public {
     addDelegate(identity, msg.sender, delegateType, delegate, validity);
   }
 
-  function addDelegateSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, string delegateType, address delegate, uint validity) public {
-    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identityOwner(identity)], identity, "addDelegate", delegateType, delegate, validity); 
+  function addDelegateSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, bytes32 delegateType, address delegate, uint validity) public {
+    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identityOwner(identity)], identity, "addDelegate", delegateType, delegate, validity);
     addDelegate(identity, checkSignature(identity, sigV, sigR, sigS, hash), delegateType, delegate, validity);
   }
 
-  function revokeDelegate(address identity, address actor, string delegateType, address delegate) internal onlyOwner(identity, actor) {
-    delegates[identity][keccak256(delegateType)][delegate] = 0;
-    DIDDelegateChanged(identity, delegateType, delegate, 0, changed[identity]);
+  function revokeDelegate(address identity, address actor, bytes32 delegateType, address delegate) internal onlyOwner(identity, actor) {
+    delegates[identity][keccak256(delegateType)][delegate] = now;
+    emit DIDDelegateChanged(identity, delegateType, delegate, now, changed[identity]);
     changed[identity] = block.number;
   }
 
-  function revokeDelegate(address identity, string delegateType, address delegate) public {
+  function revokeDelegate(address identity, bytes32 delegateType, address delegate) public {
     revokeDelegate(identity, msg.sender, delegateType, delegate);
   }
 
-  function revokeDelegateSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, string delegateType, address delegate) public {
-    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identityOwner(identity)], identity, "revokeDelegate", delegateType, delegate); 
+  function revokeDelegateSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, bytes32 delegateType, address delegate) public {
+    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identityOwner(identity)], identity, "revokeDelegate", delegateType, delegate);
     revokeDelegate(identity, checkSignature(identity, sigV, sigR, sigS, hash), delegateType, delegate);
   }
 
-  function setAttribute(address identity, address actor, string name, bytes value, uint validity ) internal onlyOwner(identity, actor) {
-    DIDAttributeChanged(identity, name, value, block.timestamp + validity, changed[identity]);
+  function setAttribute(address identity, address actor, bytes32 name, bytes value, uint validity ) internal onlyOwner(identity, actor) {
+    emit DIDAttributeChanged(identity, name, value, now + validity, changed[identity]);
     changed[identity] = block.number;
   }
 
-  function setAttribute(address identity, string name, bytes value, uint validity) public {
+  function setAttribute(address identity, bytes32 name, bytes value, uint validity) public {
     setAttribute(identity, msg.sender, name, value, validity);
   }
 
-  function setAttributeSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, string name, bytes value, uint validity) public {
-    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identity], identity, "setAttribute", name, value, validity); 
+  function setAttributeSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, bytes32 name, bytes value, uint validity) public {
+    bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identity], identity, "setAttribute", name, value, validity);
     setAttribute(identity, checkSignature(identity, sigV, sigR, sigS, hash), name, value, validity);
   }
 
-  function revokeAttribute(address identity, address actor, string name, bytes value ) internal onlyOwner(identity, actor) {
-    DIDAttributeChanged(identity, name, value, 0, changed[identity]);
+  function revokeAttribute(address identity, address actor, bytes32 name, bytes value ) internal onlyOwner(identity, actor) {
+    emit DIDAttributeChanged(identity, name, value, 0, changed[identity]);
     changed[identity] = block.number;
   }
 
-  function revokeAttribute(address identity, string name, bytes value) public {
+  function revokeAttribute(address identity, bytes32 name, bytes value) public {
     revokeAttribute(identity, msg.sender, name, value);
   }
 
- function revokeAttributeSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, string name, bytes value) public {
+ function revokeAttributeSigned(address identity, uint8 sigV, bytes32 sigR, bytes32 sigS, bytes32 name, bytes value) public {
     bytes32 hash = keccak256(byte(0x19), byte(0), this, nonce[identity], identity, "revokeAttribute", name, value); 
     revokeAttribute(identity, checkSignature(identity, sigV, sigR, sigS, hash), name, value);
   }
 
@@ -1,6 +1,6 @@
 {
   "name": "ethr-did-registry",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "A repository storing keys and other data about Decentralized Identifiers (DIDs)",
   "main": "build/contracts/EthereumDIDRegistry.json",
   "directories": {
@@ -14,7 +14,7 @@
     "js-sha3": "^0.7.0",
     "ls": "^0.2.1",
     "solhint": "^1.1.10",
-    "truffle": "^4.0.6",
+    "truffle": "^4.1.6",
     "truffle-hdwallet-provider": "^0.0.3"
   },
   "scripts": {