| Entry into force: | 21 June 1985, in accordance with article VII (1). |
| Registration: | 21 June 1985, No. 23431. |
| Status: | Signatories: 8 ,Parties: 17. |
| Text: | United Nations, Treaty Series, vol. 1400, p. 339. |
Note: The present Protocol was opened for signature by all States which could become Parties to the Convention, from 16 December 1969 unitl 31 December 1970 at United Nations Headquarters in New York.
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| Participant | Signature | Ratification, Accession (a), Succession (d) |
| Austria | 22 Aug 1978 a | |
| Bosnia and Herzegovina1 | 12 Jan 1994 d | |
| China2 | ||
| Cyprus | 31 Dec 1970 | 24 Jan 1972 |
| El Salvador | 18 Dec 1970 | |
| Estonia | 21 Oct 1991 a | |
| Finland | 28 Dec 1970 | |
| Guatemala | 12 Feb 1988 a | |
| Iran (Islamic Republic of) | 5 Jun 1975 a | |
| Jamaica | 1 Jul 1970 | |
| Liberia | 16 Sep 2005 a | |
| Liechtenstein | 15 Dec 1970 | 3 Aug 1977 |
| Montenegro3 | 23 Oct 2006 d | |
| Paraguay | 19 Sep 1975 a | |
| Philippines | 16 Dec 1969 | 26 Nov 1976 |
| Serbia1 | 12 Mar 2001 d | |
| Seychelles | 28 Dec 1977 a | |
| Slovakia | 27 Apr 1999 a | |
| Spain | 31 May 2001 a | |
| Switzerland | 31 Jul 1970 | 3 Nov 1977 |
| United Kingdom of Great Britain and Northern Ireland | 17 Dec 1970 | |
| Uruguay | 17 Dec 1980 a |
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1. The former Yugoslavia had signed and ratified the Optional Protocol on 18 December 1969 and 5 March 1974, respectively. See also note 1 under "Bosnia and Herzegovina", "Croatia", "former Yugoslavia", "Slovenia", "The Former Yugoslav Republic of Macedonia" and "Yugoslavia" in the "Historical Information" section in the front matter of this volume.
2. Signed on behalf of the Republic of China on 28 December 1970. See also note 1 under "China" in the "Historical Information" section in the front matter of this volume.
3. See note 1 under "Montenegro" in the "Historical Information" section in the front matter of this volume.