Official binaries are now posted here:

https://github.com/chain2/chain2/releases/tag/v0.11L


The signature in SHA256SUMS.asc is with the same key I used to authenticate all Bitcoin XT releases since 2016,  fingerprint = 8F6E DE3A 88F8 6BC6 F982  55D7 F5D9 9379 1A77 8012