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Is there a webservice around that allows one to search the OP_RETURN data on the blockchain? More precisely: I'm looking for a service that would return the transaction ids of transactions that contain an OP_RETURN with data that matches the given expression.

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Chain.com offers OP_RETURN data for addresses, transactions and blocks.

  • While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – cdecker Aug 20 '14 at 20:25
  • @cdecker: This post seems to be providing a matching though brief answer to the question. I'd say rather the question is at fault than the answer. – Murch Aug 29 '14 at 10:35
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You can use the Coin Secrets API to obtain the OP_RETURN transactions in each block though it does not yet have a regex feature.

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