Hello,

Regarding transaction fees https://en.bitcoin.it/wiki/Transaction_fee i have several unanswered questions:

• How to calcaulate tx size ? http://bitcoin.stackexchange.com/questions/1195/how-to-calculate-transaction-size-before-sending is a good pattern but didn't mention P2SH
• What's actually measured ? inputs, outputs, signatures ?
• Is it possible to calculate tx size from its hex ?
• What's the average multi-sig input size ?
• Is there any reference implementation on calculating tx fee from size ?

Thank you