Progressive Trust

If it seems appropriate for the IETF format:
* I would suggest the phrase "progressive trust" in the privacy-ready section of the intro link to https://www.blockchaincommons.com/musings/musings-progressive-trust/.
* We can also optionally add a brief definition. Here's what we have in the IETF Lexicon: **Progressive Trust.** The concept of gradually building trust over time.

It feels somewhat important because this is more our term of art than something in super-common usage.

Start with the privacy-ready section of the introduction and compare its wording with the linked Progressive Trust article and the IETF Lexicon definition. Done means deciding whether the phrase belongs there and, if so, adding the phrase with a brief definition if appropriate.

Written by the indexing model from the issue text.