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 0x8cd82334ff5a46c46e8d56320dc57aa70f94898738f4686dfe36bafe8541dd11. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b062d711-ab2d-479a-9359-79e34a9f3dbd.json and https://artists.proofprofile.net/proofs/artist/b062d711-ab2d-479a-9359-79e34a9f3dbd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Nicolai: Die lustigen Weiber von Windsor
Mozart: Sinfonia concertante for Violin and Viola, K. 364 & Symphony No. 40, K. 550
Mozart: Sinfonia concertante in E-Flat Major, K. 364: I. Allegro maestoso
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xf5fac361a3f81c2fc713f4fa14fc2f4a47bd95498c7c5ae39adb390564f1aadc. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB01A2100180 — a six-check JSON result.
Mozart: Sinfonia concertante in E-Flat Major, K. 364: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a207c8a19fc64f3ba80a242c73400310e61db52e03368ea143f37a0ee368b4. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GB01A2100181 — a six-check JSON result.
Das Land des Lächelns - Arr. Bert Grund / Act 2: Dein ist mein ganzes Herz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72a35899113436e02eb2222e4507628a1cf226e8797404e0ea87a83cf0ff6fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF077504330 — a six-check JSON result.
Favourite Orchestral Pieces: Bizet, Massenet, Offenbach, Tchaikovsky...
Bizet: Carmen Suite No. 1: I. Prélude (Orch. Guiraud)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f7574288cb6cc1c4089e1a9353cf5686f2760cdc6c7e7b50847fb71289dcee. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA341100119 — a six-check JSON result.
Bizet: Carmen Suite No. 1: II. Aragonaise (Orch. Guiraud)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165eb11cc2c8a581226d33df01eaccb05debd477ce127c28f546aa03b7d2a834. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628700404 — a six-check JSON result.
Offenbach: Les contes d'Hoffmann, Act 4: Barcarolle. "Belle nuit, ô nuit d'amour" (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fa73964481fe31b01d816a3eaca1b1439a3e6b5f6a928af1853c3c39cdb0a9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628700412 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa828a60c535953439762e8084c201ae1bcfb1a80bcbeb61ea0decce72946e79f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628700413 — a six-check JSON result.
Mozart: Piano Concertos Nos. 5, 6, 11, 16, 17, 18 & 19
Mozart: Piano Concerto No. 16 in D Major, K. 451: I. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da9ba94b68c8ddf6525e11158e4d5f2ebbc081e2f9b50b10c084b5160c632c3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628900442 — a six-check JSON result.
Les Contes d'Hoffmann, Act III: Barcarolle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fa73964481fe31b01d816a3eaca1b1439a3e6b5f6a928af1853c3c39cdb0a9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628700412 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc2b6fc900da3ffb913656ce70c0cfb9f50e94051d400f0eb93aeb245931cff. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628700407 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cb2806ae0398c20714912658420fc3fe7c6e7aa2230e286385371c3b4d20e5. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA340301061 — a six-check JSON result.
Mozart: Piano Concerto No. 19 in F Major, K. 459: I. Allegro
Grieg: Morning Mood - Albinoni: Adagio - Gluck: Dance of the Blessed Spirits - Bach: Jesu, Joy of Man's Desiring & Badinerie - Charpentier: Te Deum - Bizet: Les toréadors & Other Classical Hi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0baf306c4573026b341f02550754aef6f5b05ea1feeed904d77e174b5748468. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628900445 — a six-check JSON result.
Godard: Jocelyn, Op. 100, Act 1: Berceuse. "Oh ! Ne t'éveille pas encore" (Instrumental Version)
Radio-Sinfonieorchester Stuttgart des SWR
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d3f1e9a10dc4d9f4649a7b4504b39c1a2cf6e9f745ef0bcdd35b47739ee809. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC628700417 — a six-check JSON result.
René Kollo - From Mary Lou To Meistersinger