WordPress/wp-includes/blocks/social-link/block.json

{
	"name": "core/social-link",
	"category": "widgets",
	"icon": "share",
	"attributes": {
		"url": {
			"type": "string"
		},
		"service": {
			"type": "string"
		},
		"label": {
			"type": "number"
		}
	}
}