From fce05d74e13fca44924a2b0812772e153fab4e5d Mon Sep 17 00:00:00 2001
From: Christian Decker <decker.christian@gmail.com>
Date: Thu, 23 Jan 2020 16:00:09 +0100
Subject: [PATCH] elements: Construct the block header hash while we parse it

---
 bitcoin/block.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bitcoin/block.c b/bitcoin/block.c
index 7415f7bad..292881adc 100644
--- a/bitcoin/block.c
+++ b/bitcoin/block.c
@@ -52,8 +52,11 @@ bitcoin_block_from_hex(const tal_t *ctx, const struct chainparams *chainparams,
 	if (is_elements(chainparams)) {
 		b->elements_hdr = tal(b, struct elements_block_hdr);
 		b->elements_hdr->block_height = pull_le32(&p, &len);
+		sha256_le32(&shactx, b->elements_hdr->block_height);
 
 		size_t challenge_len = pull_varint(&p, &len);
+		sha256_varint(&shactx, challenge_len);
+		sha256_update(&shactx, p, challenge_len);
 		b->elements_hdr->proof.challenge = tal_arr(b->elements_hdr, u8, challenge_len);
 		pull(&p, &len, b->elements_hdr->proof.challenge, challenge_len);