digraph blockchain {

size=6.25;
splines = "false";
rankdir=LR;
ranksep=0.1;
//splines=ortho;

node [ penwidth=1.75, fontname="Sans", shape = box ];
edge [ penwidth=1.75, fontname="Sans" ];
graph [ penwidth=1.75, fontname="Sans" ];

//edge [ style = invis, minlen = 1 ];
//fixedsize
nodesep = 0.25;
//concentrate = true;

tophelp0 [style = invis, label="", width=0, height=0 ];
prevout [style = invis, label="", width=0, height=0 ];
nextout [style = invis, label="", width=0, height=0 ];

subgraph cluster_tx {
    version; 
    subgraph cluster_input {
        sequence;
        vout [label="output index"];
        txid;
        input [style = invis, label="", width=0, height=0 ];

        subgraph cluster_scriptsig {
            label = "scriptSig"
            subgraph cluster_signature {
	hashtype;
	signature [style = invis, label="", width=0, height=0 ];
	label = "signature"
            }
            scriptsig [style = invis, label="", width=0, height=0 ];
        }
        label = "Input"
    }

    left0 [style = invis ];
    left1 [style = invis ];
    left2 [style = invis ];
    middle1 [style = invis, label="", width=0, height=0 ];
    middle2 [style = invis, label="", width=0, height=0 ];
    middle3 [style = invis, label="", width=0, height=1.05 ];
    middle4 [style = invis, label="", width=0, height=0 ];
    middle5 [style = invis, label="", width=0, height=0 ];
    middle6 [style = invis, label="", width=0, height=0 ];
    middle7 [style = invis, label="", width=0, height=0 ];
    middle0 [style = invis, label="", width=0, height=0 ];

    subgraph cluster_output {
        output [style = invis, label="", width=0, height=0 ];
        amount;
        script;
        label = "Output"
    }

    locktime;
    label = "A Basic Transaction With One Input & One Output"
}

prevout -> input [ style = "dashed", label = "Each input\nspends\nsatoshis\nfrom a\nprevious\noutput\n(prevout)" ];
output -> nextout [style="dashed", label = "Each output\nwaits as an\nUnspent\nTx Output\n(UTXO)\nuntil a\nlater input\nspends it"];
tophelp0 -> version [ style = invis ];

txid -> middle1 [ dir = none, label = "Select a previous tx with an\noutput to spend" ];
vout -> middle2 [ dir = none, label = "Select an output from previous tx" ];
sequence -> middle3 [ dir = none, label = "Allow override of locktime" ];
scriptsig -> middle4 [ dir = none, label = "Satisfy prevout script conditions" ];
signature -> middle5 [ dir = none, label = "Protect tx against modification\nby unauthorized parties" ];
hashtype -> middle6 [ dir = none, label = "Authorize others to modify tx;\nselect what they can modify" ];

version -> middle7 [ dir = none, label = "Indicate what rules this tx follows" ];
left2 -> locktime [ dir = none, label = "Prevent tx from being added to the\nblock chain before a particular time" ];

left0 -> amount [ dir = none, label = "Set amount to spend & pay in fees" ];
left1 -> script [ dir = none, label = "Describe conditions necessary\nto spend this output" ];


label = "(Metadata not shown: number of inputs/outputs, length in bytes of each script/scriptSig)\n \nThe Parts Of A Transaction"
}