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OP_* on Signet — Bitcoin Inquisition

slug: op-on-signet

Running experimental Bitcoin opcodes on Signet via Bitcoin Inquisition: OP_CAT, OP_CHECKSIGFROMSTACK, OP_CTV, OP_INTERNALKEY, and SIGHASH_ANYPREVOUT.

Articles (6)

  1. #1

    OP_CAT on Signet — Concatenation, Commitment, and Bitcoin Inquisition

    Satoshi disabled it in 2010. We ran it on-chain in 2026.

    Mar 16, 2026

  2. #2

    OP_CHECKSIGFROMSTACK on Signet — Sign Anything, Verify on Stack

    Satoshi disabled OP_CAT in 2010. OP_CSFS was never even enabled. We ran it on-chain in 2026.

    Mar 17, 2026

  3. #3

    OP_CHECKTEMPLATEVERIFY on Signet — Locking Outputs at UTXO Creation Time

    With OP_CAT you assemble data. With OP_CSFS you authorize it. With OP_CTV you enforce it.

    Mar 19, 2026

  4. #4

    OP_INTERNALKEY + OP_CHECKSIGFROMSTACK on Signet — Identity-Bound Authorization

    Pure CSFS asks: did someone sign this? IK + CSFS asks: did the owner sign this?

    Mar 21, 2026

  5. #5

    OP_CAT + OP_CHECKSIGFROMSTACK on Signet — Dynamic Message, Oracle Authorization

    Combining concatenation and stack-signature verification for oracle-driven scripts.

    Mar 27, 2026

  6. #6

    SIGHASH_ANYPREVOUT on Signet: When Signatures Stop Binding to UTXOs

    Standard CHECKSIG asks: did you sign for this UTXO? ANYPREVOUT relaxes that.

    Apr 11, 2026