Signature Field

Type: SIGNATURE

A cryptographically-signed field that captures user approval with tamper-evident verification.

Properties

• Dimensions: Always 1 (scalar only)

• Required: Can be set conditionally based on expressions

• Immutable: Once set, the signature cannot be changed

Signature Data Structure

{
	"timestamp": "ISO 8601 datetime",
	"signedBy": "user@example.com",
	"signatureId": "unique UUID",
	"digest": "SHA-256 hash of signed data",
	"signedData": {
		"fieldName": "field name",
		"signedBy": "user@example.com",
		"selectedAction": "action name"
	},
	"note": "optional note (up to 128 characters)"
}

Validation

• Cannot be multidimensional (dimensions must equal 1)

• Once signed, value is immutable

• Optional note field truncated to 128 characters

• Signature digest generated using SHA-256

Use Cases

• Approvals and authorizations

• Acknowledgments

• Legal agreements

• Audit trails

• Compliance verification

• Sign-off requirements