mainchain

From main +‎ chain.

mainchain (plural mainchains)

1. (nautical, usually in the plural) A chain securing the lower shrouds of the mainmast.
2. (cryptocurrencies) A blockchain with one or more sidechains attached to it.
   • 2020, Sheng Wen, Albert Zomaya, Laurence T. Yang, Algorithms and Architectures for Parallel Processing, Springer Nature, →ISBN, page 557:

     One user start^[sic] to withdraw assets from sidechain to mainchain by sending transaction.