They can be, depends on how they have been colored. 1-of-4,294,967,296 multisig is doable in bitcoin theoretically using Schnorr signatures https://blockstream.

They can be, depends on how they have been colored. 1-of-4,294,967,296 multisig is doable in bitcoin theoretically using Schnorr signatures https://blockstream.com/2015/08/24/treesignatures/ https://blockstream.com/2015/08/24/treesignatures/