cz_id_card

Czech identity card (občanský průkaz)

Czech identity card with chip and TD1 MRZ; the birth number (rodné číslo) only appears on older models or on request.

Category: Identity
Country: Czechia
Extracted fields: 14 fields
Cost: 1 credit

cz_id_cardspecimen

Document number
First name
Last name
Sex
Nationality
Date of birth
Issue date
Expiry date
Issuing country

What it checks

MRZ ICAO 9303. Check digits of the machine readable zone.
MRZ vs printed data. The MRZ matches the visible data.
National identifiers. Official checksum or format of the number (NIF, CPF, CURP, RUT, SSN…).cz_rc
Holder. Name, number or date of birth match what you expect.
Age. Minimum or maximum age from the date of birth.
Validity. Not expired on the reference date.

Extracted fields

Document numberdocument_number
First namefirst_name
Last namelast_name
Sexsex
Nationalitynationality
Date of birthbirth_date
Issue dateissue_date
Expiry dateexpiry_date
Issuing countryissuing_country
Mrzmrz
Personal numberpersonal_number
Place of birthbirth_place
Addressaddress
Issuing authorityissuing_authority

Sample request

curl https://api.constaia.com/v1/analyze \
  -H "Authorization: Bearer $CONSTAIA_API_KEY" \
  -F "file=@document.pdf" \
  -F 'options={
    "expect": "cz_id_card",
    "checks": {
      "not_expired": true,
      "holder": {
        "full_name": "Carmen Especimen Ruiz"
      }
    },
    "storage": "none"
  }'

Sample response

Fictitious data. Shortened response.

200 OK · application/json

{
  "id": "an_01J9Z3K8QW4T6Y2B7N5M1R0PXC",
  "object": "analysis",
  "status": "completed",
  "livemode": false,
  "document": {
    "type": "cz_id_card",
    "label": "Czech identity card (občanský průkaz)",
    "confidence": 0.97
  },
  "verdict": {
    "expected": [
      "cz_id_card"
    ],
    "match": true,
    "status": "valid",
    "reasons": [
      {
        "code": "type_match",
        "severity": "info",
        "message": "The document is: Czech identity card (občanský průkaz)."
      }
    ]
  },
  "fields": {
    "document_number": {
      "value": "123456789",
      "confidence": 0.99,
      "validated": true
    },
    "first_name": {
      "value": "JANA",
      "confidence": 0.98,
      "validated": null
    },
    "last_name": {
      "value": "NOVAKOVA",
      "confidence": 0.97,
      "validated": null
    },
    "sex": {
      "value": "F",
      "confidence": 0.96,
      "validated": null
    },
    "nationality": {
      "value": "CZE",
      "confidence": 0.99,
      "validated": null
    },
    "birth_date": {
      "value": "1985-07-30",
      "confidence": 0.98,
      "validated": null
    },
    "issue_date": {
      "value": "2023-03-15",
      "confidence": 0.97,
      "validated": null
    },
    "expiry_date": {
      "value": "2033-03-14",
      "confidence": 0.96,
      "validated": null
    },
    "issuing_country": {
      "value": "CZE",
      "confidence": 0.99,
      "validated": null
    },
    "mrz": {
      "value": "IDCZE1234567897<<<<<<<<<<<<<<<\n8507309F3303148CZE<<<<<<<<<<<0\nNOVAKOVA<<JANA<<<<<<<<<<<<<<<<",
      "confidence": 0.98,
      "validated": null
    },
    "personal_number": {
      "value": "855730/1236",
      "confidence": 0.97,
      "validated": null
    }
  },
  "checks": [
    {
      "code": "mrz_checksums",
      "passed": true,
      "message": "The MRZ check digits are correct."
    },
    {
      "code": "mrz_matches_visual",
      "passed": true,
      "message": "The MRZ matches the printed data."
    },
    {
      "code": "id_number",
      "passed": true,
      "message": "id_number"
    }
  ],
  "warnings": [],
  "storage": {
    "mode": "none",
    "file_deleted_at": "2026-09-29T10:00:02Z",
    "expires_at": null
  },
  "usage": {
    "credits": 1,
    "pages": 1
  }
}

FAQ

Does Constaia prove the document is authentic?

No. It checks the type, data consistency and your rules, and flags signals such as a possible edit or a screen photo. That does not prove authenticity.

Is a copy of the document kept?

No, unless you ask for it. With storage "none" (the default) the file is deleted when the analysis ends.

And for the record…

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