Sign and check
Free, and it runs entirely on your device: your keys and files never leave it.
How it works now treasuries and reserves
Free in your browser: the custodian signs each day's holdings, the issuer each report, the accountant the version it reviewed, and any holder can check. A paid digest signs the alerts for an auditor or a board.
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Built from the open-source code in BSVKey/finance-custody. To sign straight from your own systems or devices, use that code directly. For paid services, such as timestamping files on the public ledger, see Do it now.