LBRYCommunity/lbrycrd
1
0
Fork 0
Code Issues 29 Pull requests 1 Projects Releases 32 Packages Wiki Activity

Make non-minimal OP_IF/NOTIF argument non-standard for P2WSH

Browse source
This commit is contained in:
Johnson Lau 2016-09-23 13:06:45 +08:00
parent 2b514aa2ea
commit c72c5b1e3b
8 changed files with 101 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
src/policy/policy.h
View file

@ -42,6 +42,7 @@ static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY
SCRIPT_VERIFY_NULLDUMMY |
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
SCRIPT_VERIFY_CLEANSTACK |
SCRIPT_VERIFY_MINIMALIF |
SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
SCRIPT_VERIFY_LOW_S |

6
src/script/interpreter.cpp
View file

@ -428,6 +428,12 @@ bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, un
if (stack.size() < 1)
return set_error(serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL);
valtype& vch = stacktop(-1);
if (sigversion == SIGVERSION_WITNESS_V0 && (flags & SCRIPT_VERIFY_MINIMALIF)) {
if (vch.size() > 1)
return set_error(serror, SCRIPT_ERR_MINIMALIF);
if (vch.size() == 1 && vch[0] != 1)
return set_error(serror, SCRIPT_ERR_MINIMALIF);
}
fValue = CastToBool(vch);
if (opcode == OP_NOTIF)
fValue = !fValue;

4
src/script/interpreter.h
View file

@ -94,6 +94,10 @@ enum
// Making v1-v16 witness program non-standard
//
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM = (1U << 12),
// Segwit script only: Require the argument of OP_IF/NOTIF to be exactly 0x01 or empty vector
//
SCRIPT_VERIFY_MINIMALIF = (1U << 13),
};
bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);

2
src/script/script_error.cpp
View file

@ -63,6 +63,8 @@ const char* ScriptErrorString(const ScriptError serror)
return "Non-canonical signature: S value is unnecessarily high";
case SCRIPT_ERR_SIG_NULLDUMMY:
return "Dummy CHECKMULTISIG argument must be zero";
case SCRIPT_ERR_MINIMALIF:
return "OP_IF/NOTIF argument must be minimal";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS:
return "NOPx reserved for soft-fork upgrades";
case SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM:

3
src/script/script_error.h
View file

@ -39,7 +39,7 @@ typedef enum ScriptError_t
SCRIPT_ERR_NEGATIVE_LOCKTIME,
SCRIPT_ERR_UNSATISFIED_LOCKTIME,
/* BIP62 */
/* Malleability */
SCRIPT_ERR_SIG_HASHTYPE,
SCRIPT_ERR_SIG_DER,
SCRIPT_ERR_MINIMALDATA,
@ -48,6 +48,7 @@ typedef enum ScriptError_t
SCRIPT_ERR_SIG_NULLDUMMY,
SCRIPT_ERR_PUBKEYTYPE,
SCRIPT_ERR_CLEANSTACK,
SCRIPT_ERR_MINIMALIF,
/* softfork safeness */
SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS,

83
src/test/data/script_tests.json
View file

@ -2125,5 +2125,88 @@
["0", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "UNSATISFIED_LOCKTIME", "CSV fails if stack top bit 1 << 31 is set and the tx version < 2"],
["4294967296", "CHECKSEQUENCEVERIFY", "CHECKSEQUENCEVERIFY", "UNSATISFIED_LOCKTIME",
"CSV fails if stack top bit 1 << 31 is not set, and tx version < 2"],
["MINIMALIF tests"],
["MINIMALIF is not applied to non-segwit scripts"],
["1", "IF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "OK"],
["2", "IF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "OK"],
["0x02 0x0100", "IF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "OK"],
["0", "IF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0x01 0x00", "IF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["1", "NOTIF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["2", "NOTIF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0x02 0x0100", "NOTIF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0", "NOTIF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "OK"],
["0x01 0x00", "NOTIF 1 ENDIF", "P2SH,WITNESS,MINIMALIF", "OK"],
["Normal P2SH IF 1 ENDIF"],
["1 0x03 0x635168", "HASH160 0x14 0xe7309652a8e3f600f06f5d8d52d6df03d2176cc3 EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
["2 0x03 0x635168", "HASH160 0x14 0xe7309652a8e3f600f06f5d8d52d6df03d2176cc3 EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
["0x02 0x0100 0x03 0x635168", "HASH160 0x14 0xe7309652a8e3f600f06f5d8d52d6df03d2176cc3 EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
["0 0x03 0x635168", "HASH160 0x14 0xe7309652a8e3f600f06f5d8d52d6df03d2176cc3 EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0x01 0x00 0x03 0x635168", "HASH160 0x14 0xe7309652a8e3f600f06f5d8d52d6df03d2176cc3 EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0x03 0x635168", "HASH160 0x14 0xe7309652a8e3f600f06f5d8d52d6df03d2176cc3 EQUAL", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
["Normal P2SH NOTIF 1 ENDIF"],
["1 0x03 0x645168", "HASH160 0x14 0x0c3f8fe3d6ca266e76311ecda544c67d15fdd5b0 EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["2 0x03 0x645168", "HASH160 0x14 0x0c3f8fe3d6ca266e76311ecda544c67d15fdd5b0 EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0x02 0x0100 0x03 0x645168", "HASH160 0x14 0x0c3f8fe3d6ca266e76311ecda544c67d15fdd5b0 EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
["0 0x03 0x645168", "HASH160 0x14 0x0c3f8fe3d6ca266e76311ecda544c67d15fdd5b0 EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
["0x01 0x00 0x03 0x645168", "HASH160 0x14 0x0c3f8fe3d6ca266e76311ecda544c67d15fdd5b0 EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
["0x03 0x645168", "HASH160 0x14 0x0c3f8fe3d6ca266e76311ecda544c67d15fdd5b0 EQUAL", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
["P2WSH IF 1 ENDIF"],
[["01", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS", "OK"],
[["02", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS", "OK"],
[["0100", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS", "OK"],
[["", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS", "EVAL_FALSE"],
[["00", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS", "EVAL_FALSE"],
[["01", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS,MINIMALIF", "OK"],
[["02", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["0100", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
[["00", "635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS", "UNBALANCED_CONDITIONAL"],
[["635168", 0.00000001], "", "0 0x20 0xc7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
["P2WSH NOTIF 1 ENDIF"],
[["01", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS", "EVAL_FALSE"],
[["02", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS", "EVAL_FALSE"],
[["0100", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS", "EVAL_FALSE"],
[["", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS", "OK"],
[["00", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS", "OK"],
[["01", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
[["02", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["0100", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS,MINIMALIF", "OK"],
[["00", "645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS", "UNBALANCED_CONDITIONAL"],
[["645168", 0.00000001], "", "0 0x20 0xf913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
["P2SH-P2WSH IF 1 ENDIF"],
[["01", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS", "OK"],
[["02", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS", "OK"],
[["0100", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS", "OK"],
[["", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS", "EVAL_FALSE"],
[["00", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS", "EVAL_FALSE"],
[["01", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
[["02", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["0100", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
[["00", "635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS", "UNBALANCED_CONDITIONAL"],
[["635168", 0.00000001], "0x22 0x0020c7eaf06d5ae01a58e376e126eb1e6fab2036076922b96b2711ffbec1e590665d", "HASH160 0x14 0x9b27ee6d9010c21bf837b334d043be5d150e7ba7 EQUAL", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
["P2SH-P2WSH NOTIF 1 ENDIF"],
[["01", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "EVAL_FALSE"],
[["02", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "EVAL_FALSE"],
[["0100", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "EVAL_FALSE"],
[["", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "OK"],
[["00", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "OK"],
[["01", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "EVAL_FALSE"],
[["02", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["0100", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "OK"],
[["00", "645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "MINIMALIF"],
[["645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS", "UNBALANCED_CONDITIONAL"],
[["645168", 0.00000001], "0x22 0x0020f913eacf2e38a5d6fc3a8311d72ae704cb83866350a984dd3e5eb76d2a8c28e8", "HASH160 0x14 0xdbb7d1c0a56b7a9c423300c8cca6e6e065baf1dc EQUAL", "P2SH,WITNESS,MINIMALIF", "UNBALANCED_CONDITIONAL"],
["The End"]
]

1
src/test/script_tests.cpp
View file

@ -89,6 +89,7 @@ static ScriptErrorDesc script_errors[]={
{SCRIPT_ERR_SIG_NULLDUMMY, "SIG_NULLDUMMY"},
{SCRIPT_ERR_PUBKEYTYPE, "PUBKEYTYPE"},
{SCRIPT_ERR_CLEANSTACK, "CLEANSTACK"},
{SCRIPT_ERR_MINIMALIF, "MINIMALIF"},
{SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS, "DISCOURAGE_UPGRADABLE_NOPS"},
{SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM, "DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM"},
{SCRIPT_ERR_WITNESS_PROGRAM_WRONG_LENGTH, "WITNESS_PROGRAM_WRONG_LENGTH"},

1
src/test/transaction_tests.cpp
View file

@ -50,6 +50,7 @@ static std::map<string, unsigned int> mapFlagNames = boost::assign::map_list_of
(string("NULLDUMMY"), (unsigned int)SCRIPT_VERIFY_NULLDUMMY)
(string("DISCOURAGE_UPGRADABLE_NOPS"), (unsigned int)SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS)
(string("CLEANSTACK"), (unsigned int)SCRIPT_VERIFY_CLEANSTACK)
(string("MINIMALIF"), (unsigned int)SCRIPT_VERIFY_MINIMALIF)
(string("CHECKLOCKTIMEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY)
(string("CHECKSEQUENCEVERIFY"), (unsigned int)SCRIPT_VERIFY_CHECKSEQUENCEVERIFY)
(string("WITNESS"), (unsigned int)SCRIPT_VERIFY_WITNESS)