thumb|250 px|Launy Grøndahl Launy Grøndahl (30 June 1886 – 21 January 1960) was a Danish conductor and composer. Grøndahl studied the violin from the age of eight.Launy Grondahl | Classical Composers
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 0x4d8caa23449056a0b530d8f169428b9703f1189a5349cda164d80bc6d4a0c2f1. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/413445f8-e08a-4e0c-8209-5e3b4a4c6501.json and https://artists.proofprofile.net/proofs/artist/413445f8-e08a-4e0c-8209-5e3b4a4c6501.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).