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 0xb4449921b5d5fb53a263a17d5518afbef08ecc9ff1335ba59497fba0bcc237b3. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0f2e472-279e-4c17-8114-dfa647bc21c1.json and https://artists.proofprofile.net/proofs/artist/d0f2e472-279e-4c17-8114-dfa647bc21c1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mass in D Major, Op. 86, B. 153: IV. Sanctus
Dvorak: Mass in D Major, Op. 86 / Janacek: Lord's Prayer
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 0x3ff195c4993e807a49574c92e8a7799485ff5992c47d883e80281dd619527c9b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DEAD60500804 — a six-check JSON result.
Choir Concerto: I. O pavelitel' sushcheva fsevo (O Master of all living)
Schnittke: Konzert für Chor, Stimmen der Natur & 3 Geistliche Gesänge - Pärt: Dopo la vittoria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a4d2eda4a82165898091857dc754e24a36799fef06f9fd0a2426e803ad0217. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DELW71350501 — a six-check JSON result.
Choir Concerto: II. Sabran' je pesen sikh, gde kazhdyj stikh (I, an expert in human passions)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca8a8e15e5a155c9d3a42ccad5154f8d71169fc544320add9c6b2294e588117. 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/DELW71350502 — a six-check JSON result.
Mass in D Major, Op. 86, B. 153: I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254c90657ce08a4b626b2e8205dfe3627b46680e4a2b926b25c21708b1b62e28. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DEAD60500801 — a six-check JSON result.
Mass in D Major, Op. 86, B. 153: III. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227b4f3489003d06f46a4c88665766afc8a0fe06b6467156301bb2703a6b0b37. 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/DEAD60500803 — a six-check JSON result.
Choir Concerto: III. Fsem tem kto vniknet fsushchnast (God, grant deliverance from sin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165a4b7a31d5b86bc1b4a7e561ff096800f5c092b7aa5d2c86d87426dc1add2b. 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/DELW71350503 — a six-check JSON result.
Choir Concerto: IV. Sej trud, shto natchinal ja s upavan'jem (Complete this work which I began)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdfaba830bc5853dff4c0a0b53fd6813951bf56e79819d4b0e31fedcf769a07. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DELW71350504 — a six-check JSON result.
Mass in D Major, Op. 86, B. 153: II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6b1039eaad0a475a22ca06fa7053c0db166e2d0b6af92ace7c78116a7b5d34. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DEAD60500802 — a six-check JSON result.
Mass in D Major, Op. 86, B. 153: V. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc633378cfa98736b7303a2b1043714e3b8721e45c6453bbfd8ff6ea656eddc7. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DEAD60500805 — a six-check JSON result.
Mass in D Major, Op. 86, B. 153: VI. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a788e5d4594e6b9983fce678c1f2d792e6231d2c7eeffaf25464ad9f8ccd05. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEAD60500806 — a six-check JSON result.