Bugfixes for BIP 174 combining and deserialization #13721

1. 
   achow101 commented at 2:06 AM on July 20, 2018: member

   This PR fixes a few bugs that were found and adds tests checking for these errors.

   Specifically:

   • Single byte keys are checked to actually be one byte.
   • Unknown global data must be merged when combining two PSBTs.
2. Check that PSBT keys are the correct length

   Checks that all of the one byte type keys are actually one byte and
   throw an error if they are not.
   
   Add tests for each type to check for this behavior.

   41df035ee1
3. Fix merging of global unknown data in PSBTs

   Actually merge the global unknown key-value pairs.
   
   Add a test for merging unknown key-value pairs.

   fad231ad41
4. fanquake added this to the milestone 0.17.0 on Jul 20, 2018
5. 
   practicalswift commented at 11:22 AM on July 20, 2018: contributor

   Concept ACK

   Thanks for taking another look at this code

6. laanwj added the label Bug on Jul 20, 2018
7. 
   sipa commented at 10:48 PM on July 20, 2018: member

   utACK fad231ad41e12b7047deb64220942ca8cb8357bc

8. 
   Christewart commented at 12:25 AM on July 24, 2018: member

   If there are still serialization questions here it might be worth testing with #12775 / #8469

9. fanquake added this to the "Blockers" column in a project

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10. 
    laanwj commented at 1:03 PM on July 25, 2018: member

    utACK fad231ad41e12b7047deb64220942ca8cb8357bc

11. laanwj merged this on Jul 25, 2018
12. laanwj closed this on Jul 25, 2018

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14. fanquake removed this from the "Blockers" column in a project

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Milestone
0.17.0