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 0x7e87a4b85d7dde92a3bacaabcfaed7c5ea3fe44e51d3d9b52591e8c450393a76. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38c5cb10-e534-4c6b-845a-5287bd24d13d.json and https://artists.proofprofile.net/proofs/artist/38c5cb10-e534-4c6b-845a-5287bd24d13d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Giuditta, RV 500.9, Pt 2: XVII. Aria. "Dormi!"
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 0x540a148716267780cbf4f27b61ed4331ed47d48b95d1f19a4817a4b4442c4032. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLY331803368 — a six-check JSON result.
Alessandro stradella: la doriclea - atto III
Alessandro Stradella: La Doriclea - Atto II
Alessandro Stradella: La Doriclea - Atto I
Stradella: Amanti olà, olà & Chi restiste al Dio bendata
Cavalieri: Rappresentatione Di Anima E Di Corpo
Saints and Sinners - The Music of Medieval and Renaissance Europe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a93e5fdd338551ceec6ee9260e3ff7728803aa1bcba643eafcee293cb2ee945. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKI199531217 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac69e0b5d52fc1af7f563265301d1b3fd4a58b4f2c63e3d2b8a1fec2b2b3c6f0. 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/HKI190008801 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ee2790b8cff06c118b7a1c1c87eb1c2cbec0a54efdb9b15e521af9b8fd87b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKI199530308 — a six-check JSON result.
Sederunt principes (4-part organum - plainchant)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ccee54ce3aa819cacdac32fb9cb5ed9f5b09950a9fdc65758f383510ebb039. 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/HKI190433631 — a six-check JSON result.
Virtuoso Dance Music from the Time of Boccaccio's Decamerone: Saltarello No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35564dd52977ca6105ce414edb7b254ccc8ef19b247a25257f52f4c3ad4f4d9a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKI199421209 — a six-check JSON result.
Laudario di Cortona: Venite a laudare (Come and praise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9237648a26b501c09db59d44701fcc02eac84ca3a033d064ce6a7dd1e32f3a. 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/HKI190556909 — a six-check JSON result.
Art & Music: Caravaggio - Music of His Time
Monteverdi: Lamento d'Arianna - Scherzi musicali cioe arie et madrigali
Ghirlanda Sacra - Il Mottetto a voce sola a Venezia
A Guided Tour of the Baroque Era, Vol. 1
Alessandro Scarlatti: Il giardino d'amore & Su le sponde del Tebro
A. Scarlatti: La Giuditta (Version for 3 Voices)
Al fragor di lieta tromba, Sinfonia: I. Allegrissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9536d52e3688b00f29bd6c56e63655d6483f6dd75e8e502c02601d5e6046835. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ITKXV1800101 — a six-check JSON result.
Al fragor di lieta tromba, Sinfonia: II. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b6ae9bae7ce0ba05a1f89f008670c00c7ed2b550cb1d0d199461c44d072aa7. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/ITKXV1800102 — a six-check JSON result.
Al fragor di lieta tromba, Sinfonia: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f2b2e79c1323f96c2a4d6e8d358a6bcd123f8eb151525e796a3b21554753bb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITKXV1800103 — a six-check JSON result.
A. Scarlatti: Il Sedecia, re di Gerusalemme
Cavalli: Arias and Duets From Didone, Egisto, Ormindo, Giasone and Calisto
Georg Philipp Telemann: Cantatas & Trio Sonatas
Rainaldi: Cantate, Duetti e Lamentazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b00a823c1113eeac29a3d3e4b808f7ce6f785470f1d142e214d7f812aa83627. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USHM81907724 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fafea7e4d54fedc633d1b6e90ca1878ce4446ed5405916c032d9f88b4794ebe. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHM81907725 — a six-check JSON result.
Coro Di Voci Bianche Pieve Cesato Ravenna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7db4063520f8bd0268fd6bf85307ef274df6181429fcb93b29d3bf274f3df9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USHM81907727 — a six-check JSON result.