From d98057662f778564554b0972d9ce54e67b45c906 Mon Sep 17 00:00:00 2001
From: Robert Martin-Legene <robert@martin-legene.dk>
Date: Mon, 1 Apr 2019 02:49:26 -0300
Subject: [PATCH] Resurrecting TimeStampAuthority.sol
---
src/TimeStampAuthority.sol | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
create mode 100644 src/TimeStampAuthority.sol
diff --git a/src/TimeStampAuthority.sol b/src/TimeStampAuthority.sol
new file mode 100644
index 0000000..2282493
--- /dev/null
+++ b/src/TimeStampAuthority.sol
@@ -0,0 +1,26 @@
+// 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];
+ }
+}
--
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