feat: added headers first sync

lib/net/pool.js

@@ -1674,12 +1674,6 @@ class Pool extends EventEmitter {
     if (this.checkpoints)
       return;
 
-    if (this.options.neutrino) {
-      const locator = await this.chain.getLocator();
-      this.sendLocator(locator, peer);
-      return;
-    }
-
     this.logger.debug(
       'Received %d block hashes from peer (%s).',
       hashes.length,
@@ -2185,6 +2179,7 @@ class Pool extends EventEmitter {
     const headers = packet.items;
 
     if (!this.checkpoints && !this.options.neutrino)
+      // todo add support for checkpoints
       return;
 
     if (!this.syncing)
@@ -2260,7 +2255,7 @@ class Pool extends EventEmitter {
     peer.blockTime = Date.now();
 
     // Request the blocks we just added.
-    if (checkpoint && !this.options.neutrino) {
+    if (checkpoint) {
       this.headerChain.shift();
       this.resolveHeaders(peer);
       return;