opcode tezos has a Turing complete language, Michelson, so if, loop, etc. are present in opcodes, otherwise is not Turing complete. Bitcoin: Minimal opcodes are lined up. There have been some opcode changes in hardfork. It’s an implementation that isn’t for smart contracts. It won’t change in the future.
https://github.com/bitcoin/bitcoin/blob/v0.14.0/src/script/script.h Ethereum…