persistence for the blockchain + everything through the chain instead of broadcasting

blockchain/block.js

@@ -24,7 +24,12 @@ class Block {
   static genesis() {
     return new this('Genesis time', '-----', 'f1r57-h45h', [], 0, DIFFICULTY);
   }
+  //we want this to eventually be continously running where there are things in the pool,
+  //however as node is single threaded, this almost has to be a fiber, and yield after every
+  //other iteration to allow for meaningful forward progress
 
+  //we can either add all new transactions into the block as we see them, or stay with the starting list, idk which
+  //to be done later
   static mineBlock(lastBlock, data) {
     let hash, timestamp;
     const lastHash = lastBlock.hash;

blockchain/index.js

@@ -28,17 +28,19 @@ class Blockchain {
     return true;
   }
 
+  //return false on failure, true on success
   replaceChain(newChain) {
     if (newChain.length <= this.chain.length) {
       console.log('Received chain is not longer than the current chain.');
-      return;
+      return false;
     } else if (!this.isValidChain(newChain)) {
       console.log('The received chain is not valid.');
-      return;
+      return false;
     }
 
     console.log('Replacing blockchain with the new chain.');
     this.chain = newChain;
+    return true;
   }
 }