chainparams: add signet fixed seeds if default network

Author: jonatack

src/kernel/chainparams.cpp

@@ -417,10 +417,12 @@ class SigNetParams : public CChainParams {
     explicit SigNetParams(const SigNetOptions& options)
     {
         std::vector<uint8_t> bin;
+        vFixedSeeds.clear();
         vSeeds.clear();
 
         if (!options.challenge) {
             bin = "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae"_hex_v_u8;
+            vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_signet), std::end(chainparams_seed_signet));
             vSeeds.emplace_back("seed.signet.bitcoin.sprovoost.nl.");
             vSeeds.emplace_back("seed.signet.achownodes.xyz."); // Ava Chow, only supports x1, x5, x9, x49, x809, x849, xd, x400, x404, x408, x448, xc08, xc48, x40c
 
@@ -500,8 +502,6 @@ class SigNetParams : public CChainParams {
         assert(consensus.hashGenesisBlock == uint256{"00000008819873e925422c1ff0f99f7cc9bbb232af63a077a480a3633bee1ef6"});
         assert(genesis.hashMerkleRoot == uint256{"4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"});
 
-        vFixedSeeds.clear();
-
         m_assumeutxo_data = {
             {
                 .height = 160'000,