Returns a single block's header. BlockId can either be a block hash or a block height.
Block identifier, as the block height or block hash.
^0[xX][0-9a-fA-F]{1,64}$|[0-9]{1,12}
GET /blocks/{blockId}/header HTTP/1.1 Host: dot-playbook.nownodes.io Accept: */*
successful operation
{ "parentHash": "text", "number": "text", "stateRoot": "text", "extrinsicRoot": "text", "digest": { "logs": [ { "type": "text", "index": "text", "value": [ "text" ] } ] } }