Resurrecting TimeStampAuthority.sol

src/TimeStampAuthority.sol

+// 20180718 Robert Martin-Legene <robert@nic.ar>
+// Time stamp authority
+
+pragma solidity ^0.4.24;
+      
+contract TimeStampAuthority {
+	// This mapping is almost an "associative array"
+	mapping (uint256 => uint) private hashstore;
+
+	// Stores hashes (256 bit uint) of a document in the mapping
+	function put( uint256[] hasharray ) public {
+                uint256 i = hasharray.length;
+                while (i>0) {
+                    i--;
+                    uint256 h = hasharray[i];
+                    if (hashstore[h] == 0) {
+		        hashstore[h] = block.number;
+                    }
+                }
+	}
+
+	// Returns the block number in which the hash was first seen
+	function get( uint256 hash ) public view returns (uint) {
+		return hashstore[hash];
+	}
+}