This should be fairly straightforward. The share conversion protocol accepts two shares as input: values were originally written as $\chi_i$ and $k_i$ in the original protocol. Both should be converted to new $t$ out of $n$ shares and this should occur at the end of the presign protocol.
This should be fairly straightforward. The share conversion protocol accepts two shares as input: values were originally written as $\chi_i$ and $k_i$ in the original protocol. Both should be converted to new $t$ out of $n$ shares and this should occur at the end of the presign protocol.
Relevant parts of spec: Section 4 (Proposal)