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It looks like Joseph Liu, Victor Wei and Duncan Wong made the same observation in "Linkable Spontaneous Anonymous Group
Signature for Ad Hoc Groups" 2004 https://eprint.iacr.org/2004/027.pdf
The proposed scheme is basically the same as what I propose above, and the Liu, Wei & Wong 2004 publication seems to predate the 2007 Fujisaki & Suzuki "Traceable ring signature" https://eprint.iacr.org/2006/389.pdf cited by cryptonote.
Signature for Ad Hoc Groups" 2004 https://eprint.iacr.org/2004/027.pdf
The proposed scheme is basically the same as what I propose above, and the Liu, Wei & Wong 2004 publication seems to predate the 2007 Fujisaki & Suzuki "Traceable ring signature" https://eprint.iacr.org/2006/389.pdf cited by cryptonote.
For his master project/thesis, Jesper Borgstrup (https://jesper.borgstrup.dk/about/) worked on integrating ring-signatures to bitmessage to support a decentralized and trustless e-voting system. The thesis is titled "Private, trustless and decentralized message consensus and voting schemes" (https://jesper.borgstrup.dk/2015/01/masters-thesis-private-trustless-decentralized-message-consensus-voting-schemes/) and can be of interest.
In particular he based his work on the 2004 paper you mentioned by Liu, Wei & Wong. He translated it to elliptic curves and implemented in Python to integrate it in PyBitmessage.
We discovered cryptonote later on and were actually surprised to see that they based their work on "traceable ring signature" to make it linkable without mentioning this prior work.
-- NP
