The checksum of the content published to Blob API, applicable when the layer storage volume type is durable and therefore the content is constant over time. The algorithm used to calculate the checksum is user specific. Algorithms that you can use are, for example, MD5 or SHA1. This is not a secure hash, so you should only use it to detect changes in content.

The compressed size in bytes of the content published to Blob API, applicable when the layer storage volume type is durable and therefore the content is constant over time. Applicable when Content-Encoding is set to gzip when uploading and downloading data in the Blob API.

The content published directly in the metadata and encoded in base64. The size of the content is limited. Either data or dataHandle must be present.

The handle created when uploading the content to the Blob API, that is used to retrieve the content at a later stage. Either data or dataHandle must be present.

The nominal size in bytes of the content published to Blob API, applicable when the layer storage volume type is durable and therefore the content is constant over time. When compression is enabled, this is the size of the uncompressed content.

A key that specifies the partition that the content is related to. It is required. If the layer's partitioning scheme is set to heretile, the partition key is the tile key. The maximum length of the partition key is 500 characters.

The timestamp of the content, in milliseconds since the Unix epoch. Mandatory for layers of type stream. The format of the timestamp is user specific. If the content contains multiple elements each having its own timestamp, we recommend setting the metadata timestamp to the earliest of them.