- What exactly is this field for?
- What format is the "tag" supposed to be in?
- Does the recipient see it? Does this info survive a snapshot?
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Helmar
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Brent Butler
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1 Answers
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It just adds an user-defined tag to your transaction.
Format
It contains 27 trytes (=uppercase ABCDEFGHIJKLMNOPQRSTUVWXYZ and the number 9)
- If you enter "MY9CUSTOM9TAG" the actual tag will be
MY9CUSTOM9TAG99999999999999
- If you leave the field empty, the tag will be
999999999999999999999999999
- The recipient sees it.
- It can be viewed in Tangle explorers (like thetangle.org)
- It does not survive snapshots but you can still look at it in Tangle explorers that support viewing transactions before snapshots
Current usage
- If you want to quickly find your transaction you can add a tag (e.g.
BRENT9BUTLER
) to your transactions and search by tag in a Tangle explorer - You can leave friendly messages with your transfers

Zauz
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1To add to current usage: attaching a customer reference or similar can work well – Jon Story Nov 28 '17 at 21:04