The Rowan Tree is a traditional Scottish folk song by Carolina Nairne. An early publication occurred in 1843.WHITELAW, Alexander. Book of Scottish Song; Collected and Illustrated with Historical and C
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 0x1d3d3de8f04cce6f130eaa6bba562a150f19433c6281f1cf894a5db66ff3a055. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c24897d-7332-40cc-9351-2550b8d66f45.json and https://artists.proofprofile.net/proofs/artist/3c24897d-7332-40cc-9351-2550b8d66f45.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.