Add cpunet prefix to PoW function and update CPUNET type in param.rs

Signed-off-by: Calisto Abel Mathias <[email protected]>

Author: Calisto-Mathias

bitcoin/src/network/params.rs

@@ -67,6 +67,7 @@
 //! # }
 //! ```
 
+use primitives::Block;
 use units::{BlockHeight, BlockInterval};
 
 use crate::network::Network;
@@ -254,11 +255,11 @@ impl Params {
     pub const CPUNET: Params = Params {
         network: Network::CPUNet,
         bip16_time: 1333238400, // Apr 1 2012
-        bip34_height: 1,
-        bip65_height: 1,
-        bip66_height: 1,
-        rule_change_activation_threshold: 1512, // 75%
-        miner_confirmation_window: 2016,
+        bip34_height: BlockHeight::from_u32(1),
+        bip65_height: BlockHeight::from_u32(1),
+        bip66_height: BlockHeight::from_u32(1),
+        rule_change_activation_threshold: BlockInterval::from_u32(1512), // 75%
+        miner_confirmation_window: BlockInterval::from_u32(2016),
         pow_limit: Target::MAX_ATTAINABLE_MAINNET,
         max_attainable_target: Target::MAX_ATTAINABLE_MAINNET,
         pow_target_spacing: 10 * 60,            // 10 minutes.

primitives/src/block.rs

@@ -196,6 +196,7 @@ impl Header {
     // This is the same as `Encodable` but done manually because `Encodable` isn't in `primitives`.
     pub fn block_hash(&self) -> BlockHash {
         let mut engine = sha256d::Hash::engine();
+        engine.input("cpunet\0".as_bytes());
         engine.input(&self.version.to_consensus().to_le_bytes());
         engine.input(self.prev_blockhash.as_byte_array());
         engine.input(self.merkle_root.as_byte_array());