curl --request POST \
  --url https://api-dev.narrative.io/encryption-materials \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "display_name": "My encryption material",
  "description": "Some kind of description",
  "tags": [
    "use-case-1"
  ]
}
'

{
  "id": "tmh-9w"
}