# Proofs Object

Proofs Object attributes.

## Attributes

| Name | Type | Description |
| --- | --- | --- |
| expires\_at | `Date&Time` | Proof expiration date. |
| created\_at | `Date&Time` | Proof creation date. |
| external\_reference\_id | `string` | Optional identifier for the proof in the customer's external system. Maximum length is 100 characters. |

## Relationships

| Name | Type | Description |
| --- | --- | --- |
| proof\_type | to-one | [Proof Types Object](../proof-types/proof-types-object.html#proof-types-object-v34). Returns the proof type linked to the proof. |
| entity | to-one | [Identity Object](../identities/identity-object.html#identity-object-v34) or [Addresses Object](../addresses/address-object.html#addresses-object-v34). Returns the entity linked to the proof. |

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