For bitcoin you'd probably not be able to really determine it. One component would be reasonably straightforward, take the fee paid for the transaction and div

For bitcoin you'd probably not be able to really determine it. One component would be reasonably straightforward, take the fee paid for the transaction and divide it by the block reward it appears in, it's arguably directly responsible for that percentage of the emissions related to that block. The other potential component would be any impact on the value of bitcoin due to the transaction. It's likely close enough to zero most of the time, but when it isn't zero it's gonna be a doozy.