A more thorough explanation:

Definition: Blanc seign is a legal term in French civil law that refers to a signed paper given to someone with the power to bind the signer within the limits of the agreement between the signer and the grantee. It is similar to a power of attorney.

A power of attorney is a legal document that grants someone the authority to act as an agent or attorney-in-fact for the grantor. This means that the agent can make decisions and take actions on behalf of the grantor within the limits of the agreement.

There are different types of powers of attorney:

• Ordinary power of attorney: This is a revocable document that automatically terminates upon the death or incapacity of the principal.
• Durable power of attorney: This remains in effect during the grantor's incompetency and commonly allows an agent to make healthcare decisions for a patient who has become incompetent.
• General power of attorney: This authorizes an agent to transact business for the principal.
• Special power of attorney: This limits the agent's authority to only a specified matter.
• Springing power of attorney: This becomes effective only when needed, usu. upon the principal's incapacity.

For example, if someone is going on a long trip and wants to give their friend the authority to sign a lease on their behalf if they find a suitable apartment, they can grant their friend a special power of attorney that limits their authority to only signing a lease.

Another example is a durable power of attorney for healthcare, which allows an agent to make healthcare decisions for a patient who has become incompetent.

These examples illustrate how a power of attorney can be used to grant someone the authority to act on behalf of the grantor within the limits of the agreement.