Module: BTC::ScriptFlags

Included in:

ScriptInterpreter, ScriptInterpreterExtension

Defined in:

lib/btcruby/script/script_flags.rb

Constant Summary

SCRIPT_VERIFY_NONE =

0

SCRIPT_VERIFY_P2SH =

Evaluate P2SH subscripts (softfork safe, BIP16).

(1 << 0)

SCRIPT_VERIFY_STRICTENC =

Passing a non-strict-DER signature or one with undefined hashtype to a checksig operation causes script failure. Evaluating a pubkey that is not (0x04 + 64 bytes) or (0x02 or 0x03 + 32 bytes) by checksig causes script failure. (softfork safe, but not used or intended as a consensus rule).

(1 << 1)

SCRIPT_VERIFY_DERSIG =

Passing a non-strict-DER signature to a checksig operation causes script failure (softfork safe, BIP62 rule 1)

(1 << 2)

SCRIPT_VERIFY_LOW_S =

Passing a non-strict-DER signature or one with S > order/2 to a checksig operation causes script failure (softfork safe, BIP62 rule 5).

(1 << 3)

SCRIPT_VERIFY_NULLDUMMY =

verify dummy stack item consumed by CHECKMULTISIG is of zero-length (softfork safe, BIP62 rule 7).

(1 << 4)

SCRIPT_VERIFY_SIGPUSHONLY =

Using a non-push operator in the scriptSig causes script failure (softfork safe, BIP62 rule 2).

(1 << 5)

SCRIPT_VERIFY_MINIMALDATA =

Require minimal encodings for all push operations (OP_0… OP_16, OP_1NEGATE where possible, direct pushes up to 75 bytes, OP_PUSHDATA up to 255 bytes, OP_PUSHDATA2 for anything larger). Evaluating any other push causes the script to fail (BIP62 rule 3). In addition, whenever a stack element is interpreted as a number, it must be of minimal length (BIP62 rule 4). (softfork safe)

(1 << 6)

SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS =

Discourage use of NOPs reserved for upgrades (NOP1-10)

Provided so that nodes can avoid accepting or mining transactions containing executed NOP’s whose meaning may change after a soft-fork, thus rendering the script invalid; with this flag set executing discouraged NOPs fails the script. This verification flag will never be a mandatory flag applied to scripts in a block. NOPs that are not executed, e.g. within an unexecuted IF ENDIF block, are not rejected.

(1 << 7)

SCRIPT_VERIFY_CLEANSTACK =

Require that only a single stack element remains after evaluation. This changes the success criterion from “At least one stack element must remain, and when interpreted as a boolean, it must be true” to “Exactly one stack element must remain, and when interpreted as a boolean, it must be true”. (softfork safe, BIP62 rule 6) Note: CLEANSTACK should never be used without P2SH.

(1 << 8)

SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY =

Verify CHECKLOCKTIMEVERIFY

See BIP65 for details.

(1 << 9)