Keiler is a river icebreaker commissioned in December 2011 to serve as the flagship of Lauenburg's Water and Shipping Authority fleet of ten icebreakers, on the Elbe River. The vessel is long and wi
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a68ae821a5a0083ef891a78ecde667725be3f16e928e17b1df9e69ff43ed18e. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de84d975-adc3-4505-8a30-1bec0bdcddea.json and https://artists.proofprofile.net/proofs/artist/de84d975-adc3-4505-8a30-1bec0bdcddea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).