From 0844c8c6919f6d98ebe8a9501360ef5bc362dff3 Mon Sep 17 00:00:00 2001
From: Determinant <tederminant@gmail.com>
Date: Wed, 19 Aug 2020 01:25:20 -0400
Subject: catch up with the new P-Chain cross-chain impl

---
 plugin/evm/block.go | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'plugin/evm/block.go')

diff --git a/plugin/evm/block.go b/plugin/evm/block.go
index 449e261..9c15834 100644
--- a/plugin/evm/block.go
+++ b/plugin/evm/block.go
@@ -61,6 +61,27 @@ func (b *Block) Parent() snowman.Block {
 
 // Verify implements the snowman.Block interface
 func (b *Block) Verify() error {
+	p := b
+	path := []*Block{}
+	for {
+		if p.Status() == choices.Accepted {
+			break
+		}
+		path = append(path, p)
+		p = p.Parent().(*Block)
+	}
+	inputs := new(ids.Set)
+	for i := len(path) - 1; i >= 0; i-- {
+		p := path[i]
+		atx := p.vm.getAtomicTx(p.ethBlock)
+		inputs.Union(atx.UnsignedTx.(UnsignedAtomicTx).InputUTXOs())
+	}
+	tx := b.vm.getAtomicTx(b.ethBlock)
+	atx := tx.UnsignedTx.(*UnsignedImportTx)
+	if atx.SemanticVerify(b.vm, tx) != nil {
+		return errInvalidBlock
+	}
+
 	_, err := b.vm.chain.InsertChain([]*types.Block{b.ethBlock})
 	return err
 }
-- 
cgit v1.2.3-70-g09d2