I now know it's a decentralized social media like, but to clear a few things up, generally speaking in elliptic curve cryptography all numbers are to be considered a valid private key with 1 exception which is the group order n, in any curve you can pick any random number whether greater than n or smaller, negative or positive, they all are valid private keys.
So, as long as you hold a private key, you can convert that to as many different curve public keys as you want, but it's not safe to carry a funded private key, in your clipboard when online going to different apps, pages etc. And it's not safe to use nostr keys to generate Bitcoin addresses to store large amounts of fund.
If you need more details, here is the address type wallets use nowadays :
# Copyright (c) 2017, 2020 Pieter Wuille
#
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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# THE SOFTWARE.
"""Reference implementation for Bech32/Bech32m and segwit addresses."""
from enum import Enum
class Encoding(Enum):
"""Enumeration type to list the various supported encodings."""
BECH32 = 1
BECH32M = 2
CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
BECH32M_CONST = 0x2bc830a3
def bech32_polymod(values):
"""Internal function that computes the Bech32 checksum."""
generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
chk = 1
for value in values:
top = chk >> 25
chk = (chk & 0x1ffffff) << 5 ^ value
for i in range(5):
chk ^= generator[i] if ((top >> i) & 1) else 0
return chk
def bech32_hrp_expand(hrp):
"""Expand the HRP into values for checksum computation."""
return [ord(x) >> 5 for x in hrp] + [0] + [ord(x) & 31 for x in hrp]
def bech32_verify_checksum(hrp, data):
"""Verify a checksum given HRP and converted data characters."""
const = bech32_polymod(bech32_hrp_expand(hrp) + data)
if const == 1:
return Encoding.BECH32
if const == BECH32M_CONST:
return Encoding.BECH32M
return None
def bech32_create_checksum(hrp, data, spec):
"""Compute the checksum values given HRP and data."""
values = bech32_hrp_expand(hrp) + data
const = BECH32M_CONST if spec == Encoding.BECH32M else 1
polymod = bech32_polymod(values + [0, 0, 0, 0, 0, 0]) ^ const
return [(polymod >> 5 * (5 - i)) & 31 for i in range(6)]
def bech32_encode(hrp, data, spec):
"""Compute a Bech32 string given HRP and data values."""
combined = data + bech32_create_checksum(hrp, data, spec)
return hrp + '1' + ''.join([CHARSET[d] for d in combined])
def bech32_decode(bech):
"""Validate a Bech32/Bech32m string, and determine HRP and data."""
if ((any(ord(x) < 33 or ord(x) > 126 for x in bech)) or
(bech.lower() != bech and bech.upper() != bech)):
return (None, None, None)
bech = bech.lower()
pos = bech.rfind('1')
if pos < 1 or pos + 7 > len(bech) or len(bech) > 90:
return (None, None, None)
if not all(x in CHARSET for x in bech[pos+1:]):
return (None, None, None)
hrp = bech[:pos]
data = [CHARSET.find(x) for x in bech[pos+1:]]
spec = bech32_verify_checksum(hrp, data)
if spec is None:
return (None, None, None)
return (hrp, data[:-6], spec)
def convertbits(data, frombits, tobits, pad=True):
"""General power-of-2 base conversion."""
acc = 0
bits = 0
ret = []
maxv = (1 << tobits) - 1
max_acc = (1 << (frombits + tobits - 1)) - 1
for value in data:
if value < 0 or (value >> frombits):
return None
acc = ((acc << frombits) | value) & max_acc
bits += frombits
while bits >= tobits:
bits -= tobits
ret.append((acc >> bits) & maxv)
if pad:
if bits:
ret.append((acc << (tobits - bits)) & maxv)
elif bits >= frombits or ((acc << (tobits - bits)) & maxv):
return None
return ret
def decode(hrp, addr):
"""Decode a segwit address."""
hrpgot, data, spec = bech32_decode(addr)
if hrpgot != hrp:
return (None, None)
decoded = convertbits(data[1:], 5, 8, False)
if decoded is None or len(decoded) < 2 or len(decoded) > 40:
return (None, None)
if data[0] > 16:
return (None, None)
if data[0] == 0 and len(decoded) != 20 and len(decoded) != 32:
return (None, None)
if data[0] == 0 and spec != Encoding.BECH32 or data[0] != 0 and spec != Encoding.BECH32M:
return (None, None)
return (data[0], decoded)
def encode(hrp, witver, witprog):
"""Encode a segwit address."""
spec = Encoding.BECH32 if witver == 0 else Encoding.BECH32M
ret = bech32_encode(hrp, [witver] + convertbits(witprog, 8, 5), spec)
if decode(hrp, ret) == (None, None):
return None
return ret
