* [BrightID](https://www.brightid.org/) (a singular address that is linked to your friends’ ID in a “web of trust”) and [UBDI](https://app.ubdi.com/) lets you pull in data from a whole variety of sources and then make deals to get $ for your data.
* [Research Summary: Studying Bitcoin privacy attacks and their Impact on Bitcoin-based Identity Methods](https://www.smartcontractresearch.org/t/research-summary-studying-bitcoin-privacy-attacks-and-their-impact-on-bitcoin-based-identity-methods/1790) 2022-07SmartContractResearch
> We investigate the privacy of the method [did:btcr](https://w3c-ccg.github.io/didm-btcr/)based on the criteria adopted from [RFC 6973](https://www.rfc-editor.org/info/rfc6973).