exchange/

ChainOrchestra-SDK

Value exchange example

General design

This sample digital currency application opens accounts, manages deposits, withdrawals and transfers. The balance needs to be 0 before closing an account.

In the blockchain DB, the account name is the key and the value is the account balance.

The value exchange live demo page is on chainorchestra.net.

Desk operations

Blockchain users with BankClerk permissions manage the open / close operations.

---- ---- ---- ---- ---- ----+---- ---- ---- ----+---- ---- ---- ---- ---- ---- 
     Initial balance         |      Operation    |         Next balance
---- ---- ---- ---- ---- ----+---- ---- ---- ----+---- ---- ---- ---- ---- ---- 
                             |                   |
     <undefined>             |        open       |             0
                             |                   |
          0                  |       close       |         <undefined> 
                             |                   |
---- ---- ---- ---- ---- ----+---- ---- ---- ----+---- ---- ---- ---- ---- ---- 
 

Teller operations

Blockchain users with Cashier permissions manage the deposit / withdrawal / transfer operations.

---- ---- ---- ---- ---- ----+---- ---- ---- ----+---- ---- ---- ---- ---- ---- 
     Initial balance         |      Operation    |         Next balance
---- ---- ---- ---- ---- ----+---- ---- ---- ----+---- ---- ---- ---- ---- ---- 
                             |                   |
           N                 |     deposit x     |          N + x
                             |                   |
           N                 |    withdrawal x   |          N - x
                             |                   |
   fromAccount: N            |     transfer x    |          N - x
    toAccount: M             |                   |          M + x
                             |                   |
---- ---- ---- ---- ---- ----+---- ---- ---- ----+---- ---- ---- ---- ---- ---- 
 

Sample session

cd examples/exchange/js/
./accountList.js 
./deskOperation.js open "John Doe"
./tellerOperation.js deposit "John Doe" 100
./accountStatus.js "John Doe"
./deskOperation.js open "Joe Black"
./transferOperation.js "John Doe" "Joe Black" 10
./accountStatus.js "Joe Black"
./tellerOperation.js withdrawal "John Doe" 90
./tellerOperation.js withdrawal "Joe Black" 10
./deskOperation.js close "John Doe"
./deskOperation.js close "Joe Black"
./accountList.js