feat(token-mint-authority): add testnet faucet mint-authority program - #331
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A permissionless faucet that holds the mint authority for faucet token definitions and lets any account self-mint a fixed grant, so testers can fund themselves on testnet. The call chain is user -> token-mint-authority -> token: the program holds no key and delegates every mint to the token program under a PDA seed. - `FaucetMint` (no amount) mints a fixed 10_000e18 to the caller, at most once per 24h per (recipient, token definition), via a chained `Token::MintWithAuthority` authorized by the mint-authority PDA seed. - Rate limiting is a per-(recipient, definition) `MintAllowance` PDA (last-mint timestamp), claimed on first use and rewritten thereafter. - Wall-clock time is read from the system CLOCK_01 account, as the stablecoin program does. Setup: the faucet token must be created via the token program's `NewFungibleDefinition` with `mint_authority` set to `compute_mint_authority_pda(<program id>)`; the program refuses to mint a token whose stored authority is not its PDA.
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A permissionless faucet that holds the mint authority for faucet token definitions and lets any account self-mint a fixed grant, so testers can fund themselves on testnet. The call chain is user -> token-mint-authority -> token: the program holds no key and delegates every mint to the token program under a PDA seed.
FaucetMint(no amount) mints a fixed 10_000e18 to the caller, at most once per 24h per (recipient, token definition), via a chainedToken::MintWithAuthorityauthorized by the mint-authority PDA seed.MintAllowancePDA (last-mint timestamp), claimed on first use and rewritten thereafter.Setup: the faucet token must be created via the token program's
NewFungibleDefinitionwithmint_authorityset tocompute_mint_authority_pda(<program id>); the program refuses to mint a token whose stored authority is not its PDA.