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 0x03e2d566ffcd84a073ef5a2b19ef05ce4b11f01fc13ff4d43dfdf17ba910b9e2. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52c9b003-313c-4972-a948-b85c00e621ab.json and https://artists.proofprofile.net/proofs/artist/52c9b003-313c-4972-a948-b85c00e621ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Leonarda: A Portrait of Isabella Leonarda
Sacri concenti, Op. 3: XVI. Memento rerum à 4 a Cappella
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 0x6ab59d6e78182e82661c3a6b54331cc6c9a8e0e81dd94bc323c25e7e5bf31d6a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332104640.
Salmi Concertati a 4 voci con Strumenti, Op. 19: II. Dixit dominus for 4 Voices and 2 Violins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb03b1f55cc53c18447c3c473759609d8db1e980911d553a7b56923c686b73e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY332104648.
Rosa Mistica - Musiche delle monache lombarde del Seicento
Sacri concerti de motetti: O superbi mundi machina
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4efacde8f7e575176106fa6e789ee4dad0714ee22096f3ff30c27dc529c013. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD551012301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fa74a4f66b5a9dffe3ce0fcc9c6a27ee5016b8b86d1831a3c356874d6cd222. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD551012302.
Motetti con le litanie della Beata Vergine, Op. 10: Ave Regina Coelorum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da14c16ed8fa1915d6589ce6945dbc109aa47ee612f546bea59914f3865684c. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD551012303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8699152ebeda5523ddc6f2c814f533c923404fd4a87614940a80e79236a2bcf0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD551012304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4711d69026615fb66f8bd21bc6cce21e165c21c58940d9e159c80e8a619ea123. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITD551012313.
Soror mea, sponsa mea: Il Cantico dei Cantici nei conventi italiani tra Cinquecento e Seicento
Scintillate amicae stellae - Il Natale nei conventi italiani tra Cinquencento e Seicento
Componimenti musicali: O magnum mysterium (Venice 1623)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74df6bacd0b7929c301270817b375a6762e3f612c984ea2b21be07f828145e7. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331401902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200e0f482c18b591a25ea7baec23312bcab9f3e005b25f1f8fbe28d59f83f8e4. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331804343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f13a97938a5211fb6b28c96e3afd21a038679bddb9567923fcf341b3efca7ba. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEU241110042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee643c866c868c2c8ffe57559e262b1914b4ae2a512f1a1023171f97b67c6834. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331106342.
Canti Nel Chiostro: Musica Nei Monasteri Femminili Di Bologna
Sacred Concertos, Book 1: Ego flos campi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973ed6397143596ad9a23b22cb46f11020a4dc8209e2bf96b7ced9fdb8a1fe4c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEU241112322.