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fix:modified utils.py to remove merkle sibling #47

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fix:modified utils.py to remove merkle sibling #47

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22 changes: 13 additions & 9 deletions openverifiablellm/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -87,20 +87,24 @@ def generate_merkle_proof(
index = chunk_index

while len(leaves) > 1:
# If odd number of nodes, duplicate last
if len(leaves) % 2 == 1:
leaves.append(leaves[-1])
if index % 2 == 0:
sibling_index = index + 1
if sibling_index >= len(leaves):
sibling_index = index # odd level — no real sibling, duplicate self
is_left = False
else:
sibling_index = index - 1
is_left = True

sibling_index = index ^ 1
sibling = leaves[sibling_index]

is_left = sibling_index < index
proof.append((sibling.hex(), is_left))

# Build next level
# Build next level — same inline strategy as compute_merkle_root()
next_level = []
for i in range(0, len(leaves), 2):
combined = leaves[i] + leaves[i + 1]
left = leaves[i]
right = leaves[i + 1] if (i + 1) < len(leaves) else left
combined = left + right
parent_hex = compute_sha256(data=combined)
next_level.append(bytes.fromhex(parent_hex))

Expand Down Expand Up @@ -384,4 +388,4 @@ def clean_wikitext(text: str) -> str:
level=logging.INFO,
format="%(levelname)s - %(message)s"
)
extract_text_from_xml(sys.argv[1])
extract_text_from_xml(sys.argv[1])
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