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 0xab1238bcb70979cc3a59a1652ba360d6e6d57a4d09a4690dd403556f09b82138. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1414fa9e-1927-4004-a3f4-bfa051997b33.json and https://artists.proofprofile.net/proofs/artist/1414fa9e-1927-4004-a3f4-bfa051997b33.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Galuppi: Il mondo alla roversa (The World Turned Topsy-Turvey)
Madrigals, Book I: Ch'ami la mia vita nel tuo bel nome
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 0xc40fbef0b308555cbefe2438d6c09babff3f7cd871fbbfcdc9175b96778f9ddd. 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/FRZ132304010.
Madrigals, Book I: Se per havervi, ohimè, donato il core
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddaca9c92af9195e4b35adeb1057a53b44e72ead11ddadd9140bf0e6b863ff3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132304020.
Madrigals, Book I: A che tòrmi il ben moi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ab4d3a83a0a2b1dacec4b7000553072aced04a2193de9b7e97cae57c58f583. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/FRZ132304030.
Madrigals, Book I: Amor, per tua mercé, vattene a quella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f73920ff9fb13f9b089b37f4a08e6b61f67835d7f564104d33fae173f6f12d1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132304040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd572477bb254bad8e338327dddc2127597a1db59072cbd9a585e3fda71d0eb. 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/FRZ132304050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc204d43a201163516844fd42c3b0a85337059d181529c2e49c3391ba2e32137c. 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/FRZ132304070.
Madrigals, Book IX: Zefiro torna e di soavi accenti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6847c2c404c0e87a35553283b98fccd9c209baaa4be8dc3c05b1c60c0345df82. 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/FRZ132304230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcfb8a93c1a6c44a2830a040a377b19dbbb8382a7294dc593dddf511027a3fa. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1612966.
Monteverdi: Il secondo libro de madrigali
Il secondo libro de madrigali a cinque voci, SV 40: No. 1, E dicea l’una sospirando all’hora
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1694fa269e01618e1483f297770877f2116753af94ae0261ada4cf48b73d3444. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1769023.
Il secondo libro de madrigali a cinque voci, SV 51: No. 12, Ecco mormorar l’onde e tremolar le fronde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9a4177f835d18e387fdb75d7b892073b1997e737f04f2c592bde058b95a5b9. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1769034.
Domenico Scarlatti: Stabat mater a dieci voci
Stabat Mater a dieci voci e basso continuo: I. Stabat Mater dolorosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2b1df3dcd657d2f587b8dc0ad44ac79672a046e1ee7d22b34269756b1ad40a. 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/FRX201659200.
Monteverdi: Combattimento di Tancredi e Clorinda & Il Ballo delle Ingrate
Il Combattimento di Tancredi e Clorinda: I. Tancredi, che Clorinda un homo stima (Testo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84e54c26070ea17de05cce6d1bdacb8210aec98ab566fef215f1e12e01d6b23. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR2X41722264.
San Ignacio: L'opéra perdu des missions jésuites de l'Amazonie
Selva Morale e Spirituale: Mass for 4 Voices, SV 257. Da Capella, Kyrie
La Maîtrise de Saint Marc - LES CHORISTES
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa42efcd74171af1eeb8558e1bab26b1624443493ddf3feff031e6d4cd772a00. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZDG0500006.
Selva Morale e Spirituale: Mass for 4 Voices, SV 257. Da Capella, Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2da4e44dd6acdd1b6947f862349d64fe2f8f54f63788c22631ecf18edaea65. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FRZDG0500010.
Torrejón y Velasco: Musique à la cité des rois
Mil suspiros dió Maria: Sacred and Secular Music From the Brazilian Renaissance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c497ed35d51517a1675ff7deaa89e4b4b4db41644c2e41ed161658ae7045d05. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER180424601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025a56a26d2a98f7833da36bf97edd18a701d02a725273d9972cce37d7094ace. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER180424602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e69829a96c53367b7af7e52a3b1ea28aaafac24c1ccc4209b1d684d9fa4e84. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BER180424608.
Odi Euterpe: Italian Monody From the Early 17th Century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ea0e26c87f8dd955df382c269d3b16129975ce14426603871d84050064befd. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ES71G1300901.
La chapelle des chantres des ducs de Lorraine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d30ca34359fe2766c78e8a809607d91e4422649bb0dbb7c7e2de56979d0a1e. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USB8U1614125.