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| tl::expected< CDDC *, bool > | get_cddc (unsigned int cdd_serial) override | 
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| tl::expected< CDDC *, bool > | get_current_cddc () override | 
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| std::vector< BlindSignature > | mint (const std::string &UNUSED(transaction_reference), const std::vector< Blind > &UNUSED(blinds)) override | 
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| std::vector< MintKeyCert > | getMKCs (const std::vector< unsigned int > &UNUSED(denominations), const std::vector< BigInt > &UNUSED(mint_key_ids)) override | 
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| bool | redeem (const std::vector< Coin > &UNUSED(coins)) override | 
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| virtual std::vector< MintKeyCert > | getMKCs (const std::vector< unsigned int > &denominations, const std::vector< BigInt > &mint_key_ids)=0 | 
|  | 
| virtual std::vector< BlindSignature > | mint (std::string const &transaction_reference, const std::vector< Blind > &blinds)=0 | 
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| virtual bool | redeem (const std::vector< Coin > &coins)=0 | 
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this is for now our sample model