EIP-6110 Deposit contract fix (#2800)

* Post testnet fixes

* Fixing test

Author: bzawisto

silkworm/core/types/eip_7685_requests.cpp

@@ -55,8 +55,11 @@ Bytes extract_deposit(const Bytes& data) {
 }
 
 void FlatRequests::extract_deposits_from_logs(const std::vector<Log>& logs) {
+    // See EIP-6110: Supply validator deposits on chain
+    static constexpr evmc::bytes32 kDepositEventSignatureHash = 0x649bbc62d0e31342afea4e5cd82d4049e7e1ee912fc0889aa790803be39038c5_bytes32;
     for (const auto& log : logs) {
-        if (log.address == protocol::kDepositContractAddress) {
+        const auto is_deposit_event = std::size(log.topics) > 0 && log.topics[0] == kDepositEventSignatureHash;
+        if (log.address == protocol::kDepositContractAddress && is_deposit_event) {
             auto bytes = extract_deposit(log.data);
             requests_[magic_enum::enum_integer(FlatRequestType::kDepositRequest)] += bytes;
         }

silkworm/core/types/eip_7685_requests_test.cpp

@@ -38,7 +38,8 @@ TEST_CASE("EIP-7585 tests") {
                                        "0000000000000000000000000000000000000000000000000000000000")
                                        .value();
 
-        const std::vector logs = {Log{.address = protocol::kDepositContractAddress, .topics = {}, .data = encoded_event}};
+        // Topics is a single-element vector containing hash of deposit event signature
+        const std::vector logs = {Log{.address = protocol::kDepositContractAddress, .topics = {0x649bbc62d0e31342afea4e5cd82d4049e7e1ee912fc0889aa790803be39038c5_bytes32}, .data = encoded_event}};
 
         FlatRequests requests;
         requests.extract_deposits_from_logs(logs);