Update registrar to use expiration instead of insertion time

README.md

@@ -18,20 +18,6 @@ npm install '@ensdomains/dnsregistrar' --save
 import '@ensdomains/dnsregistrar/contracts/dnsregistar.sol'
 ```
 
-### Using js binding
-
-In addition to `DNSRegistrar` Truffle based artifact which you can call the smart contract directly, we provide a javascript wrapper which looks up DNS record, extract a proof, submit the proof via DNSSec Oracle, and register to ENS via DNSRegistrar using the proof
-
-```js
-var DNSRegistrarJs = require('@ensdomains/dnsregistrar');
-dnsregistrar = new DNSRegistrarJs(provider, dnsregistraraddress);
-dnsregistrar.claim('foo.test').then(claim => {
-  claim.submit({ from: account });
-});
-```
-
-For more detail, please [read the doc](https://dnsregistrar.readthedocs.io/en/latest/)
-
 ## Contribution guide
 
 #### Setting up

contracts/DNSClaimChecker.sol

@@ -25,15 +25,15 @@ library DNSClaimChecker {
         buf.append("\x04_ens");
         buf.append(name);
         bytes20 hash;
-        uint64 inserted;
+        uint32 expiration;
         // Check the provided TXT record has been validated by the oracle
-        (, inserted, hash) = oracle.rrdata(TYPE_TXT, buf.buf);
+        (, expiration, hash) = oracle.rrdata(TYPE_TXT, buf.buf);
         if (hash == bytes20(0) && proof.length == 0) return (address(0x0), false);
 
         require(hash == bytes20(keccak256(proof)));
 
         for (RRUtils.RRIterator memory iter = proof.iterateRRs(0); !iter.done(); iter.next()) {
-            require(inserted + iter.ttl >= block.timestamp, "DNS record is stale; refresh or delete it before proceeding.");
+            require(RRUtils.serialNumberGt(expiration + iter.ttl, block.timestamp), "DNS record is stale; refresh or delete it before proceeding.");
 
             bool found;
             address addr;