diff --git a/ethcore/light/src/client.rs b/ethcore/light/src/client.rs
index 2d9b643bc..81355bf0f 100644
--- a/ethcore/light/src/client.rs
+++ b/ethcore/light/src/client.rs
@@ -103,10 +103,6 @@ impl Provider for Client {
 		Vec::new()
 	}
 
-	fn block_deltas(&self, _req: request::BlockDeltas) -> Vec<Bytes> {
-		Vec::new()
-	}
-
 	fn pending_transactions(&self) -> Vec<SignedTransaction> {
 		Vec::new()
 	}
diff --git a/ethcore/light/src/net/mod.rs b/ethcore/light/src/net/mod.rs
index efbc391e1..9b707db2f 100644
--- a/ethcore/light/src/net/mod.rs
+++ b/ethcore/light/src/net/mod.rs
@@ -23,13 +23,14 @@ use io::TimerToken;
 use network::{NetworkProtocolHandler, NetworkService, NetworkContext, NetworkError, PeerId};
 use rlp::{DecoderError, RlpStream, Stream, UntrustedRlp, View};
 use util::hash::H256;
-use util::{Mutex, RwLock};
+use util::{U256, Mutex, RwLock};
 
 use std::collections::{HashMap, HashSet};
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 use provider::Provider;
 use request::{self, Request};
+use self::buffer_flow::FlowManager;
 
 mod buffer_flow;
 
@@ -47,8 +48,8 @@ mod packet {
 	// the status packet.
 	pub const STATUS: u8 = 0x00;
 
-	// broadcast that new block hashes have appeared.
-	pub const NEW_BLOCK_HASHES: u8 = 0x01;
+	// announcement of new block hashes or capabilities.
+	pub const ANNOUNCE: u8 = 0x01;
 
 	// request and response for block headers
 	pub const GET_BLOCK_HEADERS: u8 = 0x02;
@@ -197,8 +198,8 @@ impl LightProtocol {
 		unimplemented!()
 	}
 
-	// Handle a new block hashes message.
-	fn new_block_hashes(&self, peer: &PeerId, io: &NetworkContext, data: UntrustedRlp) {
+	// Handle an announcement.
+	fn announcement(&self, peer: &PeerId, io: &NetworkContext, data: UntrustedRlp) {
 		const MAX_NEW_HASHES: usize = 256;
 
 		unimplemented!()
@@ -327,7 +328,7 @@ impl NetworkProtocolHandler for LightProtocol {
 		let rlp = UntrustedRlp::new(data);
 		match packet_id {
 			packet::STATUS => self.status(peer, io, rlp),
-			packet::NEW_BLOCK_HASHES => self.new_block_hashes(peer, io, rlp),
+			packet::ANNOUNCE => self.announcement(peer, io, rlp),
 
 			packet::GET_BLOCK_HEADERS => self.get_block_headers(peer, io, rlp),
 			packet::BLOCK_HEADERS => self.block_headers(peer, io, rlp),
diff --git a/ethcore/light/src/provider.rs b/ethcore/light/src/provider.rs
index 6d4fb2ea0..d6458bedd 100644
--- a/ethcore/light/src/provider.rs
+++ b/ethcore/light/src/provider.rs
@@ -60,9 +60,6 @@ pub trait Provider: Send + Sync {
 	/// Provide header proofs from the Canonical Hash Tries.
 	fn header_proofs(&self, req: request::HeaderProofs) -> Vec<Bytes>;
 
-	/// Provide block deltas.
-	fn block_deltas(&self, req: request::BlockDeltas) -> Vec<Bytes>;
-
 	/// Provide pending transactions.
 	fn pending_transactions(&self) -> Vec<SignedTransaction>;
 }
\ No newline at end of file
diff --git a/ethcore/light/src/request.rs b/ethcore/light/src/request.rs
index 63ec07068..f5c594970 100644
--- a/ethcore/light/src/request.rs
+++ b/ethcore/light/src/request.rs
@@ -83,31 +83,6 @@ pub struct HeaderProofs {
 	pub from_level: u32,
 }
 
-/// A request for block deltas -- merkle proofs of all changed trie nodes and code.
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct BlockDeltas {
-	/// Block hashes deltas are being requested for.
-	pub block_hashes: Vec<H256>,
-}
-
-/// A request for a single transaction merkle proof.
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct TransactionProof {
-	/// The block hash to use the initial state from.
-	pub block_hash: H256,
-	/// The address to treat as the sender of the transaction.
-	pub sender: Address,
-	/// The raw transaction request itself.
-	pub transaction: Transaction,
-}
-
-/// A request for transaction merkle proofs.
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct TransactionProofs {
-	/// Transaction proof requests.
-	pub tx_reqs: Vec<TransactionProof>,
-}
-
 /// Kinds of requests.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Kind {
@@ -123,10 +98,6 @@ pub enum Kind {
 	Codes,
 	/// Requesting header proofs (from the CHT).
 	HeaderProofs,
-	/// Requesting block deltas.
-	Deltas,
-	/// Requesting merkle proofs for transactions.
-	TransactionProofs,
 }
 
 /// Encompasses all possible types of requests in a single structure.
@@ -144,10 +115,6 @@ pub enum Request {
 	Codes(ContractCodes),
 	/// Requesting header proofs.
 	HeaderProofs(HeaderProofs),
-	/// Requesting block deltas.
-	Deltas(BlockDeltas),
-	/// Requesting transaction proofs.
-	TransactionProofs(TransactionProofs),
 }
 
 impl Request {
@@ -160,8 +127,6 @@ impl Request {
 			Request::StateProofs(_) => Kind::StateProofs,
 			Request::Codes(_) => Kind::Codes,
 			Request::HeaderProofs(_) => Kind::HeaderProofs,
-			Request::Deltas(_) => Kind::Deltas,
-			Request::TransactionProofs(_) => Kind::TransactionProofs,
 		}
 	}
 }
\ No newline at end of file