Hi Michele,

You are seeing this discrepancy due to the address types in use. addmultisigaddress uses the default address type of the wallet, which is p2sh-segwit. createmultisig uses a default address type of legacy. To have createmultisig get addmultisigaddress's result, you need to add the string "p2sh-segwit" to the end of your command. To have addmultisigaddress get createmultisig's result, you need to add the string "legacy" to the end of your command.

On 4/19/19 7:53 AM, Michele Federici via bitcoin-dev wrote:

> Hi everyone,
>
> I'm writing here because I didn't find any resources in the docs or
> somewhere else online explaining this, I don't get if this is a bug or
> I'm missing something.
>
> I was working on a function to derive the pay-to-script-hash from a
> multisig script and I was checking the results against the bitcoin
> core's `addmultisigaddress` output, although I was quite sure that my
> implementation was correct, my output address was different.
> By chance, I then tried the `createmultisigaddress` method, using the
> same public keys, and this time the output was matching with mine.
>
> I thought the outputs of `addmultisigaddress` and
> `createmultisigaddress` were supposed to be the same, but instead are
> inconsistent from each other:
>
> ```
> bitcoin-cli addmultisigaddress 1
> '["045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0c
> e382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d","02ac46
> c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831","0224a4dc
> 5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e07"]'
> {
> "address": "36ULucjWUTrDvaJzCyhFoVbDoNS6Zum2Du",
> "redeemScript":
> "5141045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c
> 0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d2102ac4
> 6c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831210224a4dc
> 5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e0753ae"
> }
> ```
>
> ```
> bitcoin-cli createmultisig 1
> '["045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0c
> e382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d","02ac46
> c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831","0224a4dc
> 5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e07"]'
> {
> "address": "3GiimyxF1R5VixfBFAbQZbuy9EesD2r6n1",
> "redeemScript":
> "5141045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c
> 0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d2102ac4
> 6c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831210224a4dc
> 5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e0753ae"
> }
> ```
>
> I was also pretty confused by the fact that the `redeemScript` is the
> same, only the addresses are different, and calling `decodescript` with
> it I get the same address as `createmultisig`:
>
> ```
> bitcoin-cli decodescript
> "5141045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c
> 0ce382458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d2102ac4
> 6c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831210224a4dc
> 5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e0753ae"
> {
> "asm": "1
> 045897fee25bd7c5692510b2f50fcae9aa20fbc4d49d59814f4c7fdb5c4bc6eb1c0ce38
> 2458f9588e922e0d509ed8d34856787380075b00418b02e0bf7c652ef9d
> 02ac46c6d74d15e60f4f1035ff07ef740aca1d68d55ba0b8d336a73d7a35858831
> 0224a4dc5620714a9ecf67a09583d1e4c04f5bedb8ecea99028da05bb15a2a7e07 3
> OP_CHECKMULTISIG",
> "reqSigs": 1,
> "type": "multisig",
> "addresses": [
> "12PfkcWheYsfFddWfHhaXpFDVx78gnKQ9k",
> "1AYLXzXd6N2avqW4j8Gyhb8jb2jXvNPyuV",
> "1PWsxtcBMRHTSX2L7wrXgwnFigHD3KhbFT"
> ],
> "p2sh": "3GiimyxF1R5VixfBFAbQZbuy9EesD2r6n1"
> }
> ```
>
> I don't understand, how can this be possible?
>
> Thank you,
> Michele
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