> echo hello
-> data: {hello}

> info 
-> data: {size:0}

> commit 

> append_tx abc
-> code: OK

> info 
-> data: {size:1}

> commit 
-> data: {750502FC7E84BBD788ED589624F06CFA871845D1}

> query abc
-> code: OK
-> data: {Index=0 value=abc exists=true}

> append_tx def=xyz
-> code: OK

> commit 
-> data: {76393B8A182E450286B0694C629ECB51B286EFD5}

> query def
-> code: OK
-> data: {Index=1 value=xyz exists=true}