/// short_channel_id (aka unspent_tx_output_identier). For BTC/tBTC channels the top three
/// bytes are the block height, the next 3 the transaction index within the block, and the
/// final two the output within the transaction.
/// short_channel_id (aka unspent_tx_output_identier). For BTC/tBTC channels the top three
/// bytes are the block height, the next 3 the transaction index within the block, and the
/// final two the output within the transaction.