j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAut?Check out Factom, they have done a ton of work on this concept
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BITCOIN_ECDSA"1AKHViYgBGbmxi8qiJkNvoHNeDu9m3MfPE##computed_sig##
https://whatsonchain.com/tx/3ca8c519c46113fb1005486ad9a6351a4c8591127cee3b952ad542b264a4cd9e