# Article 9 — Designation to identify natural persons **Commission Delegated Regulation (EU) 2025/1140 · binding · OJ L, 2025/1140, 10.6.2025 · dated 27 Feb 2025 [in force]** *In force · Commission Delegated Regulation (EU) 2025/1140, OJ L, 2025/1140, 10.6.2025 · Checked against EUR-Lex on 26 Oct 2026 · [Official source](https://eur-lex.europa.eu/eli/reg_del/2025/1140/oj/eng)* 1. A client who is a natural person shall be identified in the crypto-asset service provider’s records using the designation resulting from the concatenation of the ISO 3166-1 alpha-2 (2-letter country code) of the client’s nationality, followed by the national client identifier specified in Annex II to Delegated Regulation (EU) 2017/590, based on the client’s nationality. 2. The national client identifier referred to in paragraph 1 shall be assigned in accordance with the priority levels provided for in Annex II of Delegated Regulation (EU) 2017/590 using the highest priority identifier that a person has, regardless of whether that identifier is already known to the crypto-asset service provider. 3. For the purposes of identifying a natural person, if the person is a national of more than one European Economic Area (EEA) country, the country code of the first nationality when sorted alphabetically by its ISO 3166-1 alpha-2 code and the identifier of that nationality assigned in accordance with paragraph 2 shall be used. 4. Where a natural person has a non-EEA nationality, the highest priority identifier in accordance with the field referring to ‘all other countries’ provided in Annex II of Delegated Regulation (EU) 2017/590 shall be used. Where a natural person has EEA and non-EEA nationality, the country code of the EEA nationality and the highest priority identifier of that nationality assigned in accordance with paragraph 2 shall be used. 5. Where a client is a resident of a country other than the one of its nationality, crypto-asset service providers shall also identify that person based on the country of residence of the person as prescribed in Field 41 of Table 2 in the Annex. 6. Where the identifier assigned in accordance with paragraph 2 is based on CONCAT, the client shall be identified by the crypto-asset service provider using the concatenation of the following elements in the following order:\ a) the date of birth of the person in the format YYYYMMDD;\ b) the five first characters of the first name of the person;\ c) the five first characters of the surname of the person.\\ 7. For the purposes of paragraph 6, prefixes to names shall be excluded and first names and surnames shorter than five characters shall be appended by ‘#’ so as to ensure that references to names and surnames in accordance with paragraph 6 contain five characters. All characters shall be in upper case. No apostrophes, accents, hyphens, punctuation marks or spaces shall be used.