ELTOO Pre-Coin Txn

Creating a transaction that spends an as yet created coin is not as tricky as it sounds.

Create 2 new addresses and send some funds to the first.

newaddress;newaddress

Note that you can chain functions with ;

send amount:1 address:0x0BD4C2C80609CA63CAF5B004037E6F4F1A4A56F97904B6C1B791802C2F13E504

Now create transaction spending that input.. sending 1 Minima to the other new output..

txncreate id:pretxn

txnoutput id:pretxn amount:1 address:0x01C0771C94D680E2E6CADA900D28061223E383EAF9646CA7F045209907D81DA7

To find the input coin use:

coins relevant:true

txninput id:pretxn coinid:0x2156B370A764DFB7D25B8A2F71305B9BECAE6A804E076A0333DF0645C2449CB3

You should now have an unsigned transaction with 1 Minima coin input and 1 Minima coin output.

You can sign it automagically - since the inputs are 'simple' with

txnsign id:pretxn publickey:auto

Now we have a fully valid transaction but have not posted it yet.

Let's create a transaction that spends the output. This is important as the signatures will be dependent on the coinid used in the previous transaction, so any changes will mean they will be invalid.

txncreate id:posttxn

You will see that when you do 'txnlist'.. the last piece of data in the JSON is 'outputcoindata'. This is a HEX representation of the coin outputs and can be used as an input to another transaction - with the correct CoinID. Copy that and use it like so..

txninput id:posttxn coindata:0x0000002015B0B62181547D83C563D8B1925B53655A2A8F7FF8B1F7479FB202829B89838200000001FF0001060000000100000100010000000001000000010000010000

And add an output to 0xFF.. Just for giggles.

txnoutput id:posttxn address:0xFF amount:1

Sign the post transaction..

txnsign id:posttxn publickey:auto

We now have a transaction that cannot be changed, as the signatures would be invalid, using a coin that does not currently exist. Let's post the FIRST 'pretxn'

txnpost id:pretxn auto:true

You will need to wait for it to confirm. Use 'balance' to see.

And once you have all the funds - the change and the coin you just sent - let's post the second 'post' transaction.

txnpost id:posttxn auto:true

If all went well - that should all work and the final result is 1 Minima sent to 0xFF!..

Well Done!

You may have to delete old transactions, using txndelete, if you don't need them anymore..

txndelete id:pretxn;txndelete id:posttxn

The next ability we will look at is a 'floating' coin.