Jtdylktuy

According to bip65
https://github.com/bitcoin/bips/blob/master/bip-0065.mediawiki

I can use expressions like IF ... ELSE ... ENDIF
Here is example script from this document:

IF

    HASH160 <Hash160(encryption key)> EQUALVERIFY

    <publisher pubkey> CHECKSIG

ELSE

    <expiry time> CHECKLOCKTIMEVERIFY DROP

    <buyer pubkey> CHECKSIG

ENDIF

But when I trying to spend transaction with the following script:

OP_IF 

    OP_SHA256 4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a OP_EQUAL 

OP_ELSE 

    10 OP_CHECKLOCKTIMEVERIFY OP_DROP OP_SHA256 dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d986 OP_EQUAL

OP_ENDIF

https://tchain.btc.com/dbf477b700b7e159c07f15e1b6f5917e1247175e055fe533068a6fbc4ce2c374

I get error:

bitcoin-cli -testnet sendrawtransaction 020000000174c3e24cbc6f8a0633e55f055e1747127e91f5b6e1157fc059e1b700b777f4db000000000151ffffffff01c0d401000000000023a820dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d9868700000000

error code: -26

error message:

mandatory-script-verify-flag-failed (Operation not valid with the current stack size) (code 16)

Where is my error ?

P.S.

SHA256 from 1 ->
4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a

SHA256 from 2 ->
dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d986

Your transaction only has 0x51 (just OP_1) in its scriptsig, the OP_IF consumes the 1, and OP_SHA256 then operates on an empty stack, causing this error.

Like arubi said, you're scriptSig is just 0x51:

$ bitcoin-cli decoderawtransaction 020000000174c3e24cbc6f8a0633e55f055e1747127e91f5b6e1157fc059e1b700b777f4db000000000151ffffffff01c0d401000000000023a820dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d9868700000000

{

  "txid": "2e7c6efc9dc6104f132a10d0d64263269d1ece326b4d64cb1061fe5a81b4d53b",

  "hash": "2e7c6efc9dc6104f132a10d0d64263269d1ece326b4d64cb1061fe5a81b4d53b",

  "version": 2,

  "size": 96,

  "vsize": 96,

  "weight": 384,

  "locktime": 0,

  "vin": [

    {

      "txid": "dbf477b700b7e159c07f15e1b6f5917e1247175e055fe533068a6fbc4ce2c374",

      "vout": 0,

      "scriptSig": {

        "asm": "1",

        "hex": "51"

      },

      "sequence": 4294967295

    }

  ],

  "vout": [

    {

      "value": 0.00120000,

      "n": 0,

      "scriptPubKey": {

        "asm": "OP_SHA256 dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d986 OP_EQUAL",

        "hex": "a820dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d98687",

        "type": "nonstandard"

      }

    }

  ]

}

This means if the scriptPubKey of the input you're spending is:

OP_IF 

    OP_SHA256 4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a OP_EQUAL 

OP_ELSE 

    10 OP_CHECKLOCKTIMEVERIFY OP_DROP OP_SHA256 dbc1b4c900ffe48d575b5da5c638040125f65db0fe3e24494b76ea986457d986 OP_EQUAL

OP_ENDIF

It will execute this branch (since the top stack element is true):

OP_IF 

    OP_SHA256 4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a OP_EQUAL 

You must also provide whatever hashes to the value 4bf5122f344554c53bde2ebb8cd2b7e3d1600ad631c385a5d7cce23c7785459a in order for it to return successfully.