# get_gm_root_xprv create rootxprv from seed
# seed_str length is 512 bits.
# root_xprv length is 512 bits.
-# You can get more test data from:
+# You can get more test data from: https://gist.github.com/zcc0721/8bfc1e1c92b7cd9f00743d6878097809
# test data 1:
# seed_str: ecc2bbb6c0492873cdbc81edf56bd896d3b644047879840e357be735b7fa7b6f4af1be7b8d71cc649ac4ca3816f9ccaf11bf49f4effb845f3c19e16eaf8bfcda
# root_xprv_str: a61d6b741b0e74b8d0836ac22b675bbf8e108148ef018d1b000aef1a899a136bd316c0f59e7333520ae1a429504073b2773869e95aa95bb3a4fa0ec76744025c