Who signs
Every party to the amendment
Each party signs from its designated account, exactly as for the original agreement.
Amend a signed agreement
An agreement is already signed and something has to change. The amendment names the original by its PDF fingerprint, so the chain can be checked by anyone.
The situation
- Extending the term of a services agreement or changing its fees.
- Adding scope or a new milestone to a grant agreement.
- Updating a delivery schedule agreed between two companies.
Who signs and when it is done
Done when
Executed
When every party’s signature is recorded. The original agreement’s fingerprint is part of the sentence each party signs, so the link cannot be swapped afterwards.
How it works
1 · Load the original
Open the original agreement’s signing link or drop its signed PDF: the amendment is tied to it by its fingerprint.
2 · Prepare
Enter the parties and their accounts, load the final PDF of the amendment and create the link.
3 · Sign
Each party checks the PDF and approves the signature and its recording with HSuite Wallet.
4 · Verify
The verification shows the signatures and the fingerprint of the agreement it amends. Download the signed PDF.
What you get
- One signed PDF. The document followed by a execution certificate for the amendment, with a QR code that opens the verification.
- The evidence inside it. The original document and the evidence file are attached to the signed PDF, so it verifies on its own.
- Verification without us. Anyone drops the signed PDF on the Verify page, or scans the code: the browser re-reads the public ledger and re-checks every signature. No account, no wallet, no server — and it keeps working even if this site disappears.
Limits
- Best when the original allows it. The model clause has an optional paragraph that lets amendments be signed the same way and identified by the original’s fingerprint. Without it, check how the original agreement says it may be amended.
- Not a qualified electronic signature. Not eIDAS-qualified, not ICP-Brasil, not notarised or registered. Documents that the law requires in a special form may not be signable this way.
- A signature proves the key, not the person. It shows that the designated account signed. Identity and authority to sign are checked by the parties, through channels they trust.
- Keys are the signer’s responsibility. A lost key cannot be recovered by us, and a signature made with a compromised key may be attributed to its owner.
- Public and permanent. Names, the title and the PDF fingerprint are visible on the ledger forever. Use a neutral title if needed; the PDF itself is never recorded.
- Check the governing law. Legal effect depends on the law and on what the signers agreed. This version works with HSuite Wallet and single-key accounts.
Agreement Signer is software, not legal advice; Strater Global is not a party to documents signed with it. The model texts have not yet been reviewed by a lawyer. Read the full disclaimer before relying on it. The model clauses are available in English and Portuguese.
Rehearse it on testnet first
Testnet records have no legal value, which makes them the right place for a dry run with the other signers.