The deal & money
Forms of authentication (akta notaris, legalisasi, waarmerking)
Формы удостоверения договора (akta notaris, legalisasi, waarmerking) · Akta notaris / legalisasi / waarmerking / akta di bawah tangan
In one sentence. Four document forms with different weight in court. They are a notarial deed, legalisation of signatures before a notary, registration of an already-signed document, and a plain private contract.
| Form | What the notary does | Weight in court |
|---|---|---|
| Akta notaris | Draws up the deed, vouches for content, identities and date | Highest, "full proof" (Art. 1868 Civil Code) |
| Legalisasi | Parties sign before the notary, who certifies identities, signatures and date and registers it | High, signature and date cannot be denied |
| Waarmerking | Registers an already-signed document | Medium, only the registration date is proven |
| Akta di bawah tangan | No notary | Weak, signature can be denied (Art. 1875), date does not bind third parties (Art. 1880) |
For a lease running decades the minimum working form is legalisasi with entry in the notary's register. The owner cannot claim "I never signed", and heirs and future buyers are bound by the date. That is how leases are executed in the projects DOMA runs. A private contract is valid only until someone disputes it.
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Updated 2026-09-20. Not a public offer. Regulations change, so we cite enacted acts only and update the entry when they do.
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