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. Here's a basic "howto" on signing contracts.The correct legal persons should sign the contract. This Agreement is made as of this day of in the year 20. An artist manageent agreement is the contract between the artist and the person or company they choose to manage their career. Examples of contract signatures. MANAGEMENT AGREEMENT. Between. The Contract for completing the Work. 2. Management Services. A witness signature acts as a confirmation tool in legal agreements.