Countersign

Invoice with proof—every line item, every signature, audit-ready from day one.

Countersign is the B2B invoicing ledger built for finance teams who answer to auditors. Cryptographically sealed records. SOC-ready exports. Quiet, conservative, correct.

LEDGER

INVOICE

CS-2024-0184

Northwind Holdings$48,200.00
Due Mar 14Net 30
sealed · 0x8c4a…f29b
AUDIT TRAIL
2024-03-01T09:14:22Z|invoice.created|CS-2024-0184|user:cfo@acme|hash:0x8c4af29b; 2024-03-01T09:14:23Z|invoice.signed|CS-2024-0184|countersigned:true|hash:0x8c4af29b; 2024-03-02T11:42:08Z|invoice.sent|CS-2024-0184|recipient:ap@northwind.co|delivery:smtp-ok; 2024-03-02T11:42:09Z|audit.log.append|chain:linked|prev:0x4ae1c882|next:0x8c4af29b; 2024-03-05T16:08:51Z|payment.partial|CS-2024-0184|amount:24100.00|method:ach; 2024-03-05T16:08:52Z|reconcile.match|CS-2024-0184|gl:1200.acc-rec|status:partial; 2024-03-14T08:00:00Z|payment.full|CS-2024-0184|amount:24100.00|method:wire; 2024-03-14T08:00:01Z|invoice.closed|CS-2024-0184|sealed:true|hash:0xf982bb14;

YOUR LEDGER

Open invoices, sealed and reconciled.

OUTSTANDING

$0.00

PAID

0

OVERDUE

0

No invoices on file.

Sign in to begin your audit-ready ledger.

Cryptographic seal

Every invoice receives a SHA-256 hash linked to the prior record. Tamper with one line, the chain breaks. Auditors verify in seconds.

SOC-ready exports

One-click CSV, PDF, and signed JSON exports formatted for SOC 1, SOC 2, and ASC 606. Your finance team's quarter-end gets quieter.

Reconciliation, automatic

Match incoming wires and ACH against open invoices on the GL line you expect. Partial payments resolve themselves; you sign off.