nkeys_ed25519_user_keypair_sign_and_verify.py

1import nkeys
2
3# Create a user keypair
4nk = nkeys.create_user()
5
6# Get the public key (starts with 'U')
7public_key = nk.public_key
8print(f"Public Key: {public_key.decode()}")
9
10# Get the seed (private key, starts with 'SU')
11seed = nk.seed
12print(f"Seed: {seed.decode()}")
13
14# Data to sign
15data = b"hello world"
16
17# Sign the data
18sig = nk.sign(data)
19
20# Verify the signature using the public key
21# First, create a keypair object from the public key or seed to verify
22vk = nkeys.from_public(public_key)
23try:
24    vk.verify(data, sig)
25    print(f"Signature is valid!")
26except nkeys.ErrInvalidSignature:
27    print(f"Signature is invalid!")