OP_AND ​

OP_AND is a disabled opcode in the bitcoin scripting system.

Historical Context ​

Initially, the OP_AND opcode was designed to perform a bitwise AND operation on the top two items on the stack. This means it would take two numbers and return a new number, where each bit in the result is the logical AND of the corresponding bits in the input numbers.

However, as part of a broader effort to reduce potential vulnerabilities and to simplify bitcoin's scripting language, OP_AND was disabled early in bitcoin's history along with several other opcodes.

Operation ​

Because OP_AND is disabled, any script that contains it will immediately render the transaction invalid, regardless of other script operations or context.