Does "duly signed" require a wet-ink signature?

Not for most commercial documents. "Duly" requires proper authority, permitted form, and completed formalities — and electronic form is permitted for the majority of business documents in Hong Kong (under the Electronic Transactions Ordinance) and in the US (under ESIGN and UETA). Wet ink is only mandatory where a specific statute or instrument demands it, such as wills or certain land documents.

Is a company chop required for a document to be duly signed in Hong Kong?

Usually not as a matter of law — a signature by an authorized person binds the company. The chop is customary in HK and mainland practice and often expected by counterparties, and some documents or internal policies make it required. Where it is expected, treat it as part of the form element: signature plus chop, both from authorized hands.

What is the difference between "duly signed" and "duly executed"?

In commercial usage they largely overlap. "Executed" is the older term and can additionally imply delivery formalities — the signed document reaching the other party — especially for deeds and formal instruments. Both terms fail or pass on the same four elements: right person, authority, form, formalities.

How do I prove a document was duly signed years later?

Through the record, not the mark: identity evidence for the signer, the authority basis on file, proof of the version signed, and the completion formalities. A signing platform that exports all four as one package makes the proof a retrieval exercise; a wet signature in a drawer makes it an investigation.

Duly Signed: Meaning, Examples, and E-Signing

"Duly signed" means a document was signed the way it was supposed to be signed — by the right person, with proper authority, in the required form, and with any required formalities completed. The word "duly" is doing the legal work: a document can carry a signature and still fail to be duly signed if the signer lacked authority, the form was wrong, or a required step — witnessing, board approval, a company chop — was skipped. It is a conclusion about process, not a comment on the ink.

The Four Elements "Duly" Covers

When a statute, counterparty, or closing checklist says a document must be duly signed, it is compressing four requirements:

Right person — the signer is the individual the document names or the role requires.
Proper authority — for entity signers, the person had power to bind the organization: a title that carries it, a board resolution, or a delegation on record.
Required form — the signature appears where and how the document type demands: wet ink where mandated, a chop where customary or required, electronic form where permitted.
Completed formalities — witnessing, notarization, or certification steps the document type or jurisdiction requires were actually done.

A signature missing any one of the four is a signature that invites the counterparty to argue the contract never bound anyone. The authority layer specifically is covered in Contract Signature Lines: Names, Titles, Authority.

Term	What it adds	Common setting
Signed	A mark is present	Everything
Duly signed	Right person, authority, form, formalities	Contracts, closings
Duly executed	Same, plus delivery formalities	Deeds, formal instruments
Duly authorized	The entity approved the act	Board consents, POAs

"Executed" and "signed" blur in commercial usage; "duly" is the consistent intensifier in all of them, and it always points back to process compliance rather than to the presence of a mark. Formation mechanics are covered in Contract Execution: Meaning, Workflow, and Business Use.

Examples: Where the Requirement Bites

Cross-border supply agreements — the Hong Kong company signs with a wet signature plus company chop, the overseas buyer signs electronically; "duly signed" on both sides means two different form requirements met, not one uniform act.
Board-approved transactions — the signature page says "duly authorized by resolution of the Board"; without the resolution on record, the signature is a person signing, not a company contracting.
Closing checklists in financings — "duly signed copies" of every ancillary document, where one missed chop or one unsigned schedule unwinds the whole set.
Powers of attorney — where the jurisdiction requires witnessing, an unwitnessed signature is not duly signed regardless of how genuine it is.

The conformed-signature conventions that appear in closing sets are covered in Conformed Signatures: When a Typed Name Counts.

How Electronic Signing Satisfies "Duly"

Electronic signing changes the form element, not the standard. For the vast majority of commercial documents — where no statute mandates wet ink — a duly signed document can be produced electronically when the workflow covers the four elements:

Right person and authority — per-signer identity verification plus authority evidence retained with the document.
Required form — electronic form is permitted for the document type and jurisdiction. Hong Kong's Electronic Transactions Ordinance gives electronic signatures legal recognition for most commercial documents, with carve-outs for wills, trusts, land instruments, and certain court documents.
Formalities — witness or certification roles captured as tracked acts in the same flow where required.

What the platform contributes beyond the mark is the record that proves all four: identity events, authority basis, the document hash at signing time, and the completion timestamp — the package that answers "was this duly signed?" without reconstructing anything. The HK-specific legal landscape is in Hong Kong Businesses' Guide to Digital and Electronic Signatures, and what "signed" proves on receipt in Contract Signed: What It Means on Receipt.

Checklist Before You Call a Document Duly Signed

Signer is the right person: identity verified, not just a name typed.
Authority is on record: title, delegation, or board approval retained.
Form is permitted: electronic execution allowed for this document type and jurisdiction.
Formalities are complete: witnessing, chop, or certification done where required.
Record proves all four: the evidence package shows each element, not just the signature.

Duly Signed Across Borders, Provably: Nota Sign

The "duly" requirement is where cross-border deals either become routine or stall on formality — and Nota Sign is built so the four elements are captured by default rather than reconstructed at closing. Every signer verifies identity at the level the document class requires, the authority each signer claims is preserved in the envelope record, the document hash seals the version at signing time, and witness or certification roles join the same tracked flow where the document type demands them. The completed package — signed document, identity events, consent records, authority claims, timestamps — exports as one unit a third party can verify offline. Standard electronic signatures and X.509-backed digital signatures run in the same envelope flow, with legal coverage across more than 100 countries and regions: ESIGN and UETA in the US, eIDAS (SES, AES, QES) in the EU, and APAC depth that matters for HK deals — iAM Smart in Hong Kong, Singpass in Singapore, and regional data residency — on a SOC 2 Type II-audited environment. Cross-border execution between Hong Kong, mainland China, and overseas counterparties runs in one envelope: each side signs under its own jurisdiction's rules, and the "duly" evidence reads identically for all parties.

Nota Sign is the global product of FaDaDa, China's leading e-signature vendor, and the commercial model fits deal teams of every size: no per-seat fees, so the counsel, paralegals, and counterparties who touch a closing never become license lines; small teams start on a low-cost package, and mid-market and enterprise buyers negotiate tailored plans sized to document volume and integration patterns.

If your next closing needs "duly signed" to be provable on both sides of the border, book a demo and we will run one of your live documents through the workflow and show you the package.