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 0xdfe7c67448b9f21da20f550b0273fc593947aca122af872eabcdd5fe2323852e. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e08d10a-8d85-44d4-9259-e538e107dd07.json and https://artists.proofprofile.net/proofs/artist/5e08d10a-8d85-44d4-9259-e538e107dd07.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Symphony No. 7 in A Major, Op. 92 - Mozart: Symphony No. 35 in D Major, K. 385 "Haffner" (Remastered 1999) [Live]
Kindertotenlieder (Songs on the death of children)
Rapsodie Espagnole, Pavàne pour une infante défunte
Overture from 'The Maid of Pskov', Coriolan Overture to von Collins' play