From 8193e8cbc7b481feb3ebf123490801f34199bdbb Mon Sep 17 00:00:00 2001
From: Otto G <5030059+ottodevs@users.noreply.github.com>
Date: Wed, 15 Nov 2023 16:14:35 +0300
Subject: [PATCH] fix double-signing issue

---
 3.restricted-mint-multisig/imports/multisig.leo | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/3.restricted-mint-multisig/imports/multisig.leo b/3.restricted-mint-multisig/imports/multisig.leo
index 1652050..3c87f27 100644
--- a/3.restricted-mint-multisig/imports/multisig.leo
+++ b/3.restricted-mint-multisig/imports/multisig.leo
@@ -5,6 +5,12 @@ program multisig.aleo {
     mapping required_signatures: bool => u64;
     mapping proposals: Proposal => u64;
     mapping signers: address => bool;
+    mapping signed_addresses: Signed => bool;
+
+    struct Signed {
+        signer: address,
+        proposal: Proposal
+    }
 
     struct Proposal {
         program_address: address,
@@ -41,8 +47,11 @@ program multisig.aleo {
 
     finalize sign(caller: address, proposal: Proposal) {
         assert(Mapping::get(signers, caller));
+        let signed: Signed = Signed { signer: caller, proposal: proposal };
+        assert(!Mapping::get(signed_addresses, signed));
         let signatures: u64 = Mapping::get_or_use(proposals, proposal, 0u64);
         Mapping::set(proposals, proposal, signatures + 1u64);
+        Mapping::set(signed_addresses, signed, true);
     }
 
     transition add_signer(ticket_: ticket, new_signer: address) {