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Electrum 2 XPUB public master key #157

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Electrum 2 XPUB public master key #157

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15 changes: 15 additions & 0 deletions bitcoin/deterministic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,21 @@ def electrum_pubkey(masterkey, n, for_change=0):
offset = bin_dbl_sha256(from_int_representation_to_bytes(n)+b':'+from_int_representation_to_bytes(for_change)+b':'+bin_mpk)
return add_pubkeys('04'+mpk, privtopub(offset))

# Accepts Electrum 2 XPUB master public key, index and secondary index
# (conventionally 0 for ordinary addresses, 1 for change), returns pubkey

def electrum_pubkey_v2(masterkey, n, for_change=0):
chain = bip32_ckd(masterkey, for_change)
child_key = bip32_ckd(chain, n)
return bip32_extract_key(child_key)

# Accepts Electrum 2 XPUB master public key, index and secondary index
# (conventionally 0 for ordinary addresses, 1 for change), returns address

def electrum_address_v2(masterkey, n, for_change=0):
return pubkey_to_address(electrum_pubkey_v2(masterkey, n, for_change))


# seed/stretched seed/pubkey -> address (convenience method)


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