OpenTimestamps Uses Bitcoin Blockchain to Verify Predictions Were Made Before Outcomes

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A common problem in forecasting is 'look-ahead bias,' where predictions can be fabricated or edited after an event occurs, making it impossible to verify genuine forecasting skill. OpenTimestamps, a tool created by Bitcoin developer Peter Todd, addresses this by anchoring a cryptographic hash of a document onto the Bitcoin blockchain, serving as a tamper-evident timestamp. The process involves hashing a forecast file into a unique SHA-256 fingerprint, which is then aggregated with thousands of other hashes into a Merkle tree and recorded in a single Bitcoin transaction. Because the blockchain is decentralized and immutable, the timestamp cannot be altered retroactively, and the original document content never needs to be made public to prove its age. This approach allows forecasters to prove a prediction existed in a specific form before a specific moment without relying on any trusted third party.

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