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latestOpenAPI 3.1.0Proprietary2026-07-2265155163.6 KB

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Auth

Create wallet transaction challenge

Handles POST /v1/auth/wallet/transaction-challenge via post.v1.auth.wallet.transaction_challenge.

post/v1/auth/wallet/transaction-challenge

Request body

wallet_pubkeystring required

Solana wallet pubkey the caller intends to authenticate as. The challenge transaction is built with this pubkey as the fee payer / sole signer.

Response

Challenge issued

expires_atstring required

RFC3339 timestamp at which this challenge expires.

nonce_idstring required

Opaque server-issued nonce identifier. Echo on the subsequent login call.

unsigned_transactionstring required

Base64-encoded unsigned Solana legacy transaction (bincode wire format) containing a single Memo program instruction that encodes the login challenge. Wallets are allowed to include additional ComputeBudget or Lighthouse instructions before signing (some inject these automatically, in arbitrary positions), but the Memo instruction, the recent blockhash, and the wallet's required-signer slot must be preserved. The transaction uses a deterministic, non-recent blockhash and is never submitted on-chain.