py-lean-multisig
Python bindings for leanMultisig: XMSS signatures and zkVM-backed signature aggregation.
Requires Python >= 3.11. Wheels are built for Linux (x86_64, aarch64; glibc + musl) and macOS arm64.
Install
pip install py-lean-multisig
XMSS keygen / sign / verify
import py_lean_multisig as lm
# Key generation (seed is 32 bytes; slot range is inclusive)
sk, pk = lm.keygen(b"\x00" * 32, 0, 1023)
# Sign and verify (message is 32 bytes)
msg = b"\x42" * 32
sig = lm.sign(sk, msg, 5, rng_seed=b"\x99" * 32) # rng_seed optional
lm.verify(pk, msg, sig, 5)
# Serialize/deserialize
pk2 = lm.PublicKey.from_bytes(pk.to_bytes())
sig2 = lm.Signature.from_bytes(sig.to_bytes())
assert pk == pk2 and sig == sig2
Aggregation
Aggregate N signatures over the same (message, slot) into a single proof, then verify.
import py_lean_multisig as lm
msg, slot = b"\x42" * 32, 5
pairs = [lm.keygen(bytes([i+1])*32, 0, 1023) for i in range(4)]
pks = [pk for _, pk in pairs]
sigs = [lm.sign(sk, msg, slot, rng_seed=bytes([i+100])*32) for i, (sk, _) in enumerate(pairs)]
prover = lm.Prover(log_inv_rate=4)
verifier = lm.Verifier()
sorted_pks, agg = prover.aggregate(pks, sigs, msg, slot)
verifier.verify(sorted_pks, msg, agg, slot)
# AggregatedSignature bytes round-trip
agg2 = lm.AggregatedSignature.from_bytes(agg.to_bytes())
Hierarchical aggregation
Aggregated proofs are themselves zkVM-verifiable, so a Prover can fold
existing aggregates into a new one via the children=.
This is useful for tree-shaped aggregation (each node aggregates its sub-tree's proofs) and for distributing proving work across machines (each shard produces a child proof and a coordinator folds them).
import py_lean_multisig as lm
msg, slot = b"\x42" * 32, 5
def _signers(seed_offset, n):
pairs = [lm.keygen(bytes([seed_offset + i]) * 32, 0, 1023) for i in range(n)]
pks = [pk for _, pk in pairs]
sigs = [lm.sign(sk, msg, slot, rng_seed=bytes([seed_offset + 100 + i]) * 32)
for i, (sk, _) in enumerate(pairs)]
return pks, sigs
prover = lm.Prover(log_inv_rate=4)
verifier = lm.Verifier()
# Two disjoint sets of signers, aggregated independently.
pks_a, sigs_a = _signers(seed_offset=1, n=2)
pks_b, sigs_b = _signers(seed_offset=50, n=2)
sorted_pks_a, agg_a = prover.aggregate(pks_a, sigs_a, msg, slot)
sorted_pks_b, agg_b = prover.aggregate(pks_b, sigs_b, msg, slot)
# Top level: no fresh raw signatures, just fold the two child proofs.
# Each child is the (sorted_pub_keys, AggregatedSignature) tuple
# returned by the previous aggregate() call.
sorted_pks_top, agg_top = prover.aggregate(
[], [], msg, slot,
children=[(sorted_pks_a, agg_a), (sorted_pks_b, agg_b)],
)
verifier.verify(sorted_pks_top, msg, agg_top, slot)
You can also mix raw signatures with children at the same level — fold
two existing child aggregates plus a fresh batch of raw signatures
into one combined proof in a single aggregate() call:
# Re-use sorted_pks_a / agg_a / sorted_pks_b / agg_b from above, plus
# a fresh batch of signers not already in either child:
pks_c, sigs_c = _signers(seed_offset=150, n=2)
sorted_pks_top, agg_top = prover.aggregate(
pks_c, sigs_c, msg, slot, # fresh raw signatures
children=[(sorted_pks_a, agg_a), # plus the two children
(sorted_pks_b, agg_b)],
)
# sorted_pks_top is the union: 2 from child A + 2 from child B + 2 fresh
verifier.verify(sorted_pks_top, msg, agg_top, slot)
Development
Uses uv for venv + dependency
management
# One-time setup: create the venv, install maturin + dev deps, build
# and editable-install the extension.
uv venv
uv pip install maturin pytest mypy
uv run maturin develop --release --extras dev
# Run the test suite.
uv run pytest tests/ -v
# Verify the .pyi stubs match the runtime extension.
uv run python -m mypy.stubtest py_lean_multisig --allowlist stubtest_allowlist.txt
After Rust source changes, re-run uv run maturin develop --release to
rebuild the extension.
License
MIT OR Apache-2.0
1 maintainer
Metadata
1 maintainer
Release files for py-lean-multisig 0.4.0
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| File | Size | Uploaded | Provenance | Actions |
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| py_lean_multisig-0.4.0.tar.gz | 40.6 kB | With provenance | Details for py_lean_multisig-0.4.0.tar.gz |
Built distributions (wheels)
Total release size: 78.2 MB
Release files / py_lean_multisig-0.4.0.tar.gz
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