Opcodes · introspection · enabled

OP_ACTIVEBYTECODE (0xc1)

Pushes the bytecode being evaluated, starting after the last executed OP_CODESEPARATOR. For P2SH it is the redeem bytecode.

Verified
Stack in → out
∅ → bytecode
Since
May 2022: native introspection and 64-bit math
Cost
Base instruction cost 100 plus the byte length of the pushed result (2025 VM limits).
Bitcoin status
Not in Bitcoin (BTC)BTC has no native introspection opcodes. In Tapscript (BIP-342) this byte is an OP_SUCCESSx code reserved for future soft forks.

Example

OP_ACTIVEBYTECODE OP_HASH160

Step through it opcode by opcode in Bitauth IDE, the in-browser BCH VM debugger.

Sources

  1. CHIP-2021-02 Native Introspection Opcodes
  2. Libauth BCH_2023_05 opcodes (bch-2023-opcodes.ts)
  3. CHIP-2021-05 VM Limits: Targeted Virtual Machine Limits