Merge pull request #59 from vpulim/header-chain

Added support for setting network, hardfork-specific validation, putHeader()/putHeaders() functions

README.md

@@ -44,6 +44,8 @@ new Blockchain({db: db}).iterator('i', (block, reorg, cb) => {
         - [`blockchain.putBlock(block, [cb])`](#blockchainputblockblock-cb)
         - [`blockchain.getBlock(hash, [cb])`](#blockchaingetblockhash-cb)
         - [`blockchain.getBlocks(blockId, maxBlocks, skip, reverse, [cb])`](#blockchaingetblocksblockid-maxblocks-skip-reverse-cb)
+        - [`blockchain.putHeaders(headers, [cb])`](#blockchainputheadersheaders-cb)
+        - [`blockchain.putHeader(header, [cb])`](#blockchainputheaderheader-cb)
         - [`blockchain.selectNeededHashes(hashes, [cb])`](#blockchainselectneededhasheshashes-cb)
         - [`blockchain.delBlock(blockHash, [cb])`](#blockchaindelblockblockhash-cb)
         - [`blockchain.iterator(name, onBlock, [cb])`](#blockchainiteratorname-onblock-cb)        
@@ -119,6 +121,19 @@ Looks up many blocks relative to blockId.
 
 --------------------------------------------------------
 
+#### `blockchain.putHeaders(headers, cb)`
+Adds many headers to the blockchain.
+- `headers` - the headers to be added to the blockchain
+- `cb` - the callback. It is given two parameters `err` and the last of the saved `headers`
+--------------------------------------------------------
+
+#### `blockchain.putHeader(header, cb)`
+Adds a header to the blockchain.
+- `header` - the header to be added to the blockchain
+- `cb` - the callback. It is given two parameters `err` and the saved `header`
+
+--------------------------------------------------------
+
 #### `blockchain.getDetails(hash, cb)`
 [DEPRECATED] Returns an empty object