I would like to print qr-code with transaction that contains my home address to print it for my dog's necklace. If dog will get lost everyone can scan it and get the address. How can I prepare the transaction?

  • Why don't you just print the address as a QR-Code? What's the benefit of it being on the blockchain, when you want people to scan it from your dog's necklace?
    – Murch
    Dec 18, 2015 at 12:49
  • Because I want my dog to be the bitcoin user ;) Dec 18, 2015 at 13:03
  • Is this to put a reward for finding your dog in the case that is is lost? If so, you'd need to put a private key, not the public address. The public address is what you pay TO. What good does having an address on the blockchain associated with your dog do?
    – morsecoder
    Dec 18, 2015 at 13:45
  • Guys, it is just example to show how to prepare the transaction with custom message :P Dec 18, 2015 at 13:51
  • Your example doesn't work and only makes the question confusing. There are no custom messages in transactions.
    – Jannes
    Dec 18, 2015 at 14:19

1 Answer 1


Janina Lowisz of Bitnation's BlockchainID project became the first "World Citizen on the Blockchain" by making a sort of blockchain passport:

Janina Lowisz's blockchain passport

Something similar could be done for identifying pets.

For instructions on how she did it, see: https://github.com/MrChrisJ/World-Citizenship

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