A witness signature refers to the signature of an individual who has observed the signing of a legal document and can attest to its authenticity. A witness signature acts as a confirmation tool in legal agreements.It affirms that all signing parties authenticate the document and consent to its terms. Streamline your business operations with our management services agreement template. Safeguard your interests and ensure a successful partnership. They simply witness the signing of the contract , they may have to provide id to verify their identity. In the future if required they may be used as proof. IN WITNESS THEREOF, the parties hereto have executed or approved this Contract for Grants on the dates below their signatures. CONTRACTOR: By: Printed Name. Artist Management Agreement.