什麼是智慧合約？
智慧合約即鏈碼，就是可執行的程式碼。本章主要以fabric-samples/asset-transfer-basic/chaincode-go工程，瞭解具體什麼是智慧合約。

進入目錄/usr/local/go/src/github.com/hyperledger/fabric-samples/asset-transfer-basic。

我們可以看到
chaincode-就是智慧合約；
application-就是應用程式。
可以java、go、js語言進行開發。
我們以chaincode-go工程為例，瞭解一下智慧合約。

主要看
/usr/local/go/src/github.com/hyperledger fabric-samples/asset-transfer-basic/chaincode-go/chaincode目錄下的smartcontract.go原始檔。

// InitLedger adds a base set of assets to the ledger
func (s *SmartContract) InitLedger(ctx contractapi.TransactionContextInterface) error

// CreateAsset issues a new asset to the world state with given details.
func (s *SmartContract) CreateAsset(ctx contractapi.TransactionContextInterface,
 
 id string, color string, size int, owner string, appraisedValue int) error

// ReadAsset returns the asset stored in the world state with given id.
func (s *SmartContract) ReadAsset(ctx contractapi.TransactionContextInterface, id string) (*Asset, error)

// UpdateAsset updates an existing asset in the world state with provided parameters.
 

func (s *SmartContract) UpdateAsset(ctx contractapi.TransactionContextInterface, id string, color string, size int, owner string, appraisedValue int) error

// DeleteAsset deletes an given asset from the world state.
func (s *SmartContract) DeleteAsset(ctx contractapi.TransactionContextInterface, id string) error

// AssetExists returns true when asset with given ID exists in world state
func (s *SmartContract) AssetExists(ctx contractapi.TransactionContextInterface, id string) (bool, error)

// GetAllAssets returns all assets found in world state
func (s *SmartContract) GetAllAssets(ctx contractapi.TransactionContextInterface) ([]*Asset, error)

可以看到在chaincode-go這個工程中，智慧合約其實就是對資料的CRUD。