Mint a one-time signing challenge for a wallet.

Authorization

string

header

required

API key obtained from POST /v1/auth/keys.

application/json

address

string

required

Alephium address (base58, optional :N group suffix).

Required string length: 30 - 80

Pattern: ^[123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz:]+$

Default Response

challenge

string

required

Plaintext message to sign with the wallet (signMessage with hasher="alephium").

expiresAt

string

required

ISO-8601 expiry (5 minutes from issuance).