Update block.js

Author: leopardracer

src/esm/block.js

@@ -20,7 +20,7 @@ export class Block {
     if (buffer.length < 80) throw new Error('Buffer too small (< 80 bytes)');
     const bufferReader = new BufferReader(buffer);
     const block = new Block();
-    block.version = bufferReader.readInt32();
+    block.version = bufferReader.readUInt32();
     block.prevHash = bufferReader.readSlice(32);
     block.merkleRoot = bufferReader.readSlice(32);
     block.timestamp = bufferReader.readUInt32();
@@ -142,7 +142,7 @@ export class Block {
   toBuffer(headersOnly) {
     const buffer = new Uint8Array(this.byteLength(headersOnly));
     const bufferWriter = new BufferWriter(buffer);
-    bufferWriter.writeInt32(this.version);
+    bufferWriter.writeUInt32(this.version);
     bufferWriter.writeSlice(this.prevHash);
     bufferWriter.writeSlice(this.merkleRoot);
     bufferWriter.writeUInt32(this.timestamp);