Simple Ledger System

sls

touch account:s1, type:source, value:1000
touch account:s2, type:sink  , value:0

touch account:a1, type:regular
issue from:s1, to:a1, value:200, remarks:coins issue

touch account:a2, type:regular
issue from:a1, to:a2, value:100, remarks:coins issue

move from:a1, to:a2, value:10, remarks:a2a transfer for something
 => txn:      {id:t1, value:10}
    accounts: {id:a1, balance:190}, {id:a2, balance:110}

get account:a1, account:a2
 => accounts: {id:a1, balance:190}, {id:a2, balance:110}

copy src:t1, remarks:'repeat a prev txn'
 => txn:      {id:t2, value:10}
    accounts: {id:a1, balance:180}, {id:a2, balance:120}

reverse src:t1, remarks:'reverse a txn'
 => txn:      {id:t3, value:10}
    accounts: {id:a1, balance:190}, {id:a2, balance:110}

close account:a2, sink:s2, remarks:'account closure'
 => txn:      {id:t4, value:110}
    accounts: {id:a2, balance:0}, {id:s2, balance:110}