Hello all,

I have written a draft of a BIP to standardize the sorting of tx inputs and outputs for privacy and security reasons. A few colleagues have reviewed this and provided feedback privately, but now it's ready for feedback from a wider audience.

If there is positive sentiment about the proposal after feedback is integrated, I aim for a bip number to be assigned and have it accepted into https://github.com/bitcoin/bips

Link: https://github.com/kristovatlas/rfc/blob/master/bips/bip-li01.mediawiki

For your convenience, here's the abstract:

"Currently there is no standard for bitcoin wallet clients when ordering transaction inputs and outputs. As a result, wallet clients often have a discernible blockchain fingerprint, and can leak private information about their users. By contrast, a standard for non-deterministic sorting could be difficult to audit. This document proposes deterministic lexicographical sorting, using hashes of previous transactions and output indices to sort transaction inputs, as well as value and locking scripts to sort transaction outputs."

Thanks,

Kristov Atlas
Open Bitcoin Privacy Project Contributor, Blockchain.info Security Engineer, etc.
Twitter: @kristovatlas
Blog: kristovatlas.com