EthQL transaction confirmation via subscription

flow.graphql

# offline, sign a transaction to generate it's raw bytes 0xRAWTX
# connect to our new transaction websocket endpoint
# send the graphql mutation:
mutatation {
    sendRawTransaction(data: "0xRAWTX") {
        hash
    }
}
# get back the hash or an error
{
    hash: "0xHASH"
}
# subscribe to updates on the 0xHASH until it's been confirmed for 3 blocks
subscription {
    transaction(hash: 0xHASH, untilConfirmationDepth: 3) {
        confirmationDepth
        block {
            hash
            number
        }
    }
}
# get back block null since it's unconfirmed
{
    confirmationDepth: null,
    block: null
}
# once it's mined
{
    confirmationDepth: 1,
    block {
        hash: 0xBLOCK,
        number: 0x698765
    }
}
# .. and another tick once it's been confirmed for one block
{
    confirmationDepth: 2,
    block {
        hash: 0xBLOCK,
        number: 0x698765
    }
}
# if there's a rollback and it's unconfirmed
{
    confirmationDepth: null,
    block: null,
}
# but then another reorg and it's back in the chain
{
    confirmationDepth: 3,
    block {
        hash: 0xBLOCK2,
        number: 0x698766
    }
}
# at that point, confirmationDepth == subscription.untilConfirmationDepth, so you won't get any more updates