What information must signatories provide when signing the proposal?

Law on National Referendums, Legislative Initiatives and European Citizens? Initiative (last amended in 2012)

http://web.cvk.lv/pub/public/28862.html

 Article 8

(1) The signatures sheets shall contain the full name and the personal identity number of each signatory as indicated in his/her Latvian citizen?s passport, as well as the date of signing the signatures sheet.

(2) If a physical handicap prevents a voter from signing the signatures sheet, a member of his/her family or some other trustworthy person shall sign the signatures sheet in the voter?s presence according to his/her verbal instructions. A special entry to this effect shall be made in the signatures sheet.