post https://{chain}.gateway.tatum.io/api/core/v2/blocks
Submit a block. The node takes care of missing fields and tries to
build the block. On success, the block will be stored in the Tangle.
This endpoint will return the identifier of the built block. The
node will try to auto-fill the following fields in case they are
missing: parents, nonce.
If payload is missing, the block will be built without a payload.
protocolVersion is always required!