Ability to use signrawtransaction offline #11546

Describe the issue

Trying to sign a transaction offline using signrawtransaction will trigger an error : "Input not found or already spent" (very likely https://github.com/bitcoin/bitcoin/blob/master/src/rpc/rawtransaction.cpp#L860).

The point is to have an offline computer used as cold storage wallet and be able to sign some imported raw transactions created on another online computer (using watch-only addresses).

Can you reliably reproduce the issue?

If so, please list the steps to reproduce below:

1. Create an offline wallet (on an offline computer)
2. Export offline wallet public keys (addresses)
3. Import offline wallet public keys on an online wallet (other computer) (=> Watch-Only addresses)
4. Fund an address
5. use createarawtransaction from online wallet
6. try to sign created transaction on offline computer having offline wallet : error.

Expected behaviour

Sign the transaction, don't try to check if transaction is funded when offline.

Actual behaviour

Won't sign the transaction because don't have access to blockchain offline.

What version of bitcoin-core are you using?

0.15.0.1

Bitcoin needs the inputs to sign properly. You can provide the input scriptPubKeys to signrawtransaction with the "prevtxs" argument.

On October 21, 2017 12:42:43 PM EDT, bitcoin-throwaway notifications@github.com wrote:

Describe the issue

Trying to sign a transaction offline using signrawtransaction will trigger an error : "Input not found or already spent" (very likely https://github.com/bitcoin/bitcoin/blob/master/src/rpc/rawtransaction.cpp#L860).

The point is to have an offline computer used as cold storage wallet and be able to sign some imported raw transactions created on another online computer (using watch-only addresses).

Can you reliably reproduce the issue?

If so, please list the steps to reproduce below:

1. Create an offline wallet (on an offline computer)
2. Export offline wallet public keys (addresses)
3. Import offline wallet public keys on an online wallet (other computer) (=> Watch-Only addresses)
4. Fund an address
5. use createarawtransaction from online wallet
6. try to sign created transaction on offline computer having offline wallet : error.

Expected behaviour

Sign the transaction, don't try to check if transaction if funded when offline.

Actual behaviour

Won't sign the transaction because don't have access to blockchain offline.

What version of bitcoin-core are you using?

0.15.0.1

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As @TheBlueMatt says, this functionality exists, but you do need to know the outputs being spent. You can find these using the listunspent or gettxout RPCs on the online machine.

yes it worked, thank you !

@bitcoin-throwaway can you show me your code which using "prevtxs" argument.