diff --git a/src/types/weight_proof.py b/src/types/weight_proof.py
new file mode 100644
index 0000000000..78a3057827
--- /dev/null
+++ b/src/types/weight_proof.py
@@ -0,0 +1,84 @@
+from typing import List, Optional
+
+from attr import dataclass
+from blspy import G2Element
+
+from src.types.header_block import HeaderBlock
+from src.types.proof_of_space import ProofOfSpace
+from src.types.vdf import VDFProof
+
+from src.types.sized_bytes import bytes32
+
+from src.util import streamable
+from src.util.ints import uint64, uint32
+from src.util.streamable import Streamable
+
+
+@dataclass(frozen=True)
+@streamable
+class InfusedChallengeChains(Streamable):
+
+    # VDF from beginning to end of subslot
+    start_to_end_sublot_vdf: Optional[VDFProof]  # if not infused
+
+    # Proof of space
+    proof_of_space: Optional[ProofOfSpace]  # if infused
+
+    # VDF to signage point
+    signage_point_vdf: Optional[VDFProof]  # if infused
+
+    # VDF to signage point
+    signage_point_vdf: Optional[VDFProof]  # if infused
+
+    # VDF from infusion point to end of subslot
+    infusion_to_slot_end_vdf: Optional[VDFProof]  # if infused
+
+
+@dataclass(frozen=True)
+@streamable
+class SubEpochData(Streamable):
+
+    infused_challenge_chains = List[InfusedChallengeChains]
+    # Hash of previous subepoch final reward chain slot end
+    final_reward_chain_hash: bytes32
+    # Number of subblocks overflow in previous subepoch
+    prev_epoch_overflow_count: uint32
+    # Hash of final challenge slot end
+    final_challenge_chain_hash: bytes32
+    # (at beginning of work difficulty reset) New work difficulty and iterations per subslot
+    sub_slot_iters: Optional[uint64]
+    new_difficulty: Optional[uint64]
+
+
+@dataclass(frozen=True)
+@streamable
+class SubepochChallengeSegment(Streamable):
+
+    # Proof of space
+    proof_of_space: Optional[ProofOfSpace]  # if infused
+    # VDF to signage point
+    signage_point_vdf: Optional[VDFProof]  # if infused
+    # Signature of signage point
+    signage_point_sig: Optional[G2Element]  # if infused
+    # VDF to infusion point
+    infusion_point_vdf: Optional[VDFProof]  # if infused
+    # VDF from infusion point to end of subslot
+    infusion_to_slot_end_vdf: Optional[VDFProof]  # if infused
+
+    # VDF from beginning to end of subslot
+    slot_vdf: Optional[VDFProof]  # if not infused
+
+
+@dataclass(frozen=True)
+@streamable
+class WeightProof(Streamable):
+
+    peak: bytes32
+
+    height: uint64
+
+    sub_epoch_data: List[SubEpochData]
+
+    sub_epoch_segments: List[SubepochChallengeSegment]
+    # Recent reward chain
+    header_block: List[HeaderBlock]