findTransaction not finding tag

Question

I was experimenting with some transactions and I wonder why the node cant find a transaction when I search for it by its TAG, yet finds it when I search for it by its transaction hash.

Example:

curl http://iota.love:16000 \
-X POST \
-H 'Content-Type: application/json' \
-H 'X-IOTA-API-Version: 1' \
-d '{"command": "findTransactions", "tags": 
["XBBDSARBDBQBKBDBOCB9I9ABIAZ"]}'

for example returns

{"hashes":[],"duration":0}

while searching for the bundle hash returns me the transaction:

curl http://iota.love:16000 \
-X POST \
-H 'Content-Type: application/json' \
-H 'X-IOTA-API-Version: 1' \
-d '{"command": "findTransactions", "bundles":   
["UWDGKIXABHG9PSWYXBSRK9JRZH9NEAOHNDEUINWRKGIIPNKWUSZFCGTVFTPNKYSALGHRHSIVUCI9KXFEW"]}'

returns me the transaction

{"hashes":["KZBQRQQXRUPROLIPITVB9OOFVPVCCG9NWEPSOZCKWXNTZENUNTRNPVFXDUBKESFZ9BDADPQMKZDF99999"],"duration":1}

https://thetangle.org/transaction/KZBQRQQXRUPROLIPITVB9OOFVPVCCG9NWEPSOZCKWXNTZENUNTRNPVFXDUBKESFZ9BDADPQMKZDF99999

Answer 1

The problem is caused by the fact that a transaction has two "tag" fields. The traditional/obsolete one (called either "tag" or "obsoleteTag"), and a "new tag" which is not part of the signature.

Thetangle.org shows the new tag, while the search functions search for the old one.

So whenever the tags of a transaction differ, you won't be able to find it via the tag shown on thetangle.org.

Try QDBDSARBDBQBKBDBOCB9I9ABIAZ and you will find your transaction.