I'm trying to create a custom script with if/else and a multisig operation in one branch. Currently, my script looks thus:
OP_IF
<pub1>
OP_CHECKSIG
OP_ELSE
OP_2
<pub2>
<pub3>
<pub4>
OP_3
OP_CHECKMULTISIG
OP_ENDIF
I have calculated a testnet address (2NF3yXy2MambEnJuY7eStLNcX92WSxytLvC
) from this example script and sent testcoin there. Then, I tried spending the money with the following sig script:
OP_0 <sig2> <sig3> <redeemScript>
However, when trying to broadcast the transaction, I get an error:
PUSH TRANSACTION ERROR: 16: MANDATORY-SCRIPT-VERIFY-FLAG-FAILED (SIGNATURE MUST BE ZERO FOR FAILED CHECK(MULTI)SIG OPERATION)
For reference, here's my raw transaction:
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
Its sig script is this:
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
Which decodes to
0 3045022100f502ecfd2b7bbb3e7092b320c568abe0d68dd7e613ab3efcb9e479b2641a73a502202b416bb86bce3d242084f8e24cbed76e5a2c5a0795a5bbd7f3366bf6d086ae4f[ALL] 304402201022c7548b55f3fbe3ddf427ad2ae5c6a776e2a63ee25376dca123d53d0f940f022041aa7967208ee8aee1811f02d6c7db0ad2872304133d46dbdd117e9bc09d8c97[ALL] 632102bc050e51811c2c454bf3487129b19d60b87f7a51fb434e6073def19dc55cf4b3ac67522102a906b96ea2df77aff1f84cc9949550f8d6b8f3db5acd625d12d70b6da4b94b1e2102046e854e69a49dd210dbf554f1e420893935b47123667a1834def9fe5d44358a210325db22e2aef6f143026500522431d4f348f911562316350852e6382da6a048a753ae68
The last line is clearly visible as the redeem script, which in turn decodes to this:
OP_IF 02bc050e51811c2c454bf3487129b19d60b87f7a51fb434e6073def19dc55cf4b3 OP_CHECKSIG OP_ELSE 2 02a906b96ea2df77aff1f84cc9949550f8d6b8f3db5acd625d12d70b6da4b94b1e 02046e854e69a49dd210dbf554f1e420893935b47123667a1834def9fe5d44358a 0325db22e2aef6f143026500522431d4f348f911562316350852e6382da6a048a7 3 OP_CHECKMULTISIG OP_ENDIF
Is my sig script incorrect? Is the output script invalid? How can I fix this and make it work?
Thank you very much in advance!
EDIT: After taking into consideration Pieter's comment but placing the extra OP_0 right after the two signatures in the sig script, it worked. Here's the new decoded sig script:
0 3045022100f502ecfd2b7bbb3e7092b320c568abe0d68dd7e613ab3efcb9e479b2641a73a502202b416bb86bce3d242084f8e24cbed76e5a2c5a0795a5bbd7f3366bf6d086ae4f[ALL] 304402201022c7548b55f3fbe3ddf427ad2ae5c6a776e2a63ee25376dca123d53d0f940f022041aa7967208ee8aee1811f02d6c7db0ad2872304133d46dbdd117e9bc09d8c97[ALL] 0 632102bc050e51811c2c454bf3487129b19d60b87f7a51fb434e6073def19dc55cf4b3ac67522102a906b96ea2df77aff1f84cc9949550f8d6b8f3db5acd625d12d70b6da4b94b1e2102046e854e69a49dd210dbf554f1e420893935b47123667a1834def9fe5d44358a210325db22e2aef6f143026500522431d4f348f911562316350852e6382da6a048a753ae68
And here's the link to the transaction: https://testnet.smartbit.com.au/tx/1894cb91fde60432e59d60f30de503e8b6fbe5d1756bbf0ef7302b57bf31d195
OP_0
's at the start: one to be consumed byOP_IF
, and one which is popped off byOP_CHECKMULTISIG
. I'll turn this into a full answer once I've identified the issue.PUSH TRANSACTION ERROR: 16: MANDATORY-SCRIPT-VERIFY-FLAG-FAILED (SIGNATURE MUST BE ZERO FOR FAILED CHECK(MULTI)SIG OPERATION)