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 0xcd5d68e6689bbe457f8960079a74ecbc925f26310e0d7e59a2d21a3eb1b1079e. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d714b358-a499-4f4f-8470-615a079ccffc.json and https://artists.proofprofile.net/proofs/artist/d714b358-a499-4f4f-8470-615a079ccffc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dominica III Adventus: III. Alleluia V. Excita Domine (Alleluia)
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 0xa3b1f997c32411f539919d924b4f92767bf8c1035cf49b21396a76c9ef53674f. 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/HUA151621313.
Fifty Years of Hungaroton (1951-2001) - Conductors
Of Kings and Thrones - Classical Music of the Middle Ages
Cantiga 35: O que a Santa Maria (arr. J. Ferrero for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17630681ff4dc45d44cd3fe65c1c77b967664949ea13429537b46b0c96769f5. 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/HKI191156101.
Dance of the forest of no return (13th century) (Stantipe II) (arr. J. Ferrero for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff4038c204a057f74065fde862a890b0563c4451d4a569d199d03ef16ef7448. 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/HKI191156110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7686fb01f7640678cab7e1be8966ec6229caa07a7d622932a58bdab00578e241. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199593503.
La ultime Estampie Royale (13th century) (arr. J. Ferrero for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd65cf76a6ee3a984faa2fa074394585efb3e68af0e9df5c4b777b682ffae21. 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/HKI191155912.
Adorna Thalamum [Erfurt, 1301] (arr. C. Haas for chamber ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581e4859651f44296d4b5e98d237127ebe16c6a8c64ad1627b4f5a29c5a71ff2. 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/HKI191069801.
Lycksalighetens Ähre-Pracht – Musik i Sverige från medeltid till barock / The Splendours of Felicity – Music in Sweden from the Middle Ages to the Baroque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33dffdd7e0e222a0d73bd9115befef2fdb230f4e0f18e2933d2f3aa1edbd67b6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USB8U1042228.
St. Elizabeth Of Hungary - 2 Medieval Offices
Polyphonic Vespers for Christmas And Easter
Liturgical Chants From The City Of Ravenna - Christmas, Holy Week and Easter
Liber Sapientiae - Chants and Versetti in Medieval Codices From Hungary
Istvanffy: Missa Sancta Dorothea, "St. Dorothy Mass"
Gregorian Chants In Hungarian - Advent / Christmas / Epiphany / Holy Week / Easter / Pentecost
Gregorian Chants From Medieval Hungary, Vol.6 - Chants of the Blessed Virgin Mary and Funeral Chants
Gregorian Chants From Medieval Hungary, Vol. 7 - Istanbul Antiphonary (The)
Gregorian Chants From Medieval Hungary, Vol. 5 - Hungarian Saints
Gregorian Chants From Medieval Hungary, Vol. 4 - Easter
Gregorian Chants From Medieval Hungary, Vol. 3 – Holy Week
Gregorian Chants From Medieval Hungary, Vol. 2 - Advent / Christmas / Pentecost
Gregorian Chants From Medieval Hungary, Vol. 1 - Christmas
Gregorian Chants From Austria: From Christmas To Epiphany / Office of St. Rupert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff68b2ec9569d9ae9af1d46c2b892e227bc0e9d66d9fa2ceff120201a6a7c7a. 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/HUA251295020.
Gregorian Chants - The Offices of St. Lawrence and Mary Magdalene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bae1499e4926532395216274c3421a1dd8ad8ea667f4dc845d9b52d3bbd46fc. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/HUA253176029.
Gregorian Chant And Polyphony - The Story of Job
Old Roman Offertory: Vir erat in terra Hus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65e09f7603530a28e0a5dce5574bfccf76a12fbd3136202b02c96b6a52deb90. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HUA253223902.
Gregorian And Polyphonic Chants - The Holy Lady of Chartes
Dufay: Recollectio Omnium Festorum Beate Marie Virginis
Quae humiliter consentiens – Ibo ad montem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd036edadeed5a17d8610880560ed85f62a814045bec98b5a508bc9a5efd780ac. 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/HUA253129212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d1f09616f162b87adfe5285acec3b091c786405e61f6864eacafc796c32e6b. 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/HUA253129218.
Dufay: Hymns With Introductory Plainchant From the Cambrai Antiphonal
Genuit Puerpera / Christe, Redemptor omnium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd5939f9a38945c9ba1eb390b61e083d1b849ff17c03bd6f83d2effbd35f658. 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/HUA251295102.
Ambrosian Liturgical Chants - Advent and Christmas
Post-Tridentine Gregorian Chant in Hungary
Erik den heliges hystoria / The Historia of St. Erik
Polyphonic Vespers for St. Michael's and St. Martin's Day
Gansebuch (Das) (The Geese Book): German Medieval Chant
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f9dbe905ac0014b78e0eded8e5a74745071896073758c1daf018ba8ca78d2d. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/HKI190424511.
A Pilgrimage to Rome, Old-Roman Liturgical Chants
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297a0f46c8c8dbe62100b123075297ab53ef6dee5b5368eb8d6b68e34ce28ab4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA253157403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efa14fdc22fa1ceae0d65eee5c425eacde87750d3315167f872d07a4e246600. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/HUA253157414.
Hodie nobis de caelo: Responsorium (Responsorium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905fea98193818ed9bbf6434dde987b13b3b4571acba45385b213ecdb417b9b9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEAF75106155.
Veni redemptor gentium. Notum fecit Dominus: Hymnus. Versiculus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087a2b00090d92a6805f155577391ff66ad0575015242728aaa292b6ee6c2caf. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEAF75106156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d5819accd6dbe15a4cec70d7ea795d387216ec1bed2bf778588c0ea79c1d80. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEAF75106157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe90ddf7393cb4a2533a8601466dd47ab63c1cf95a9012d00a7d7efe9ca9824. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAF75106160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939f12e5d8621b818877230d3b5da9c237053c6cf021907381d361668d7f790c. 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/DEAF75106161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18882999be54382d5a180712cb16c33e4b86ed239a223a2368d989ae9df1fcac. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEAF75106162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b35ac693a2f38d09ad73aed00be3772f72caa284260e99505d0fbcffcc0767. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/DEAF75106163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbf9598473f868709138c1667ad3d719b0f9bfebc01e911f08278467889a3f9. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEAF75106164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74624eeef4396120f57d690487d260e226b95753d8a29dac9c6ffd4c6ef126f. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/DEAF75106165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60143af017d254d1f1800731c04714b1d2a60ec12f95752aee40c9f3db47950f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAF75106166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1454af847f05511028fdfb7d8ae281d6d5d2c3022c3b04902133165b754fb151. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAF75106167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf907dabc2002a2ebfba3a651e57653b2bcc47f5634881bdb2af4f4c84cc4efa. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/DEAF75106172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd34a73e16fe6c85aac95112bd8d1f3affb4ab197c097c985573bb1886a9db0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAF75106174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81155f8c34700cd3dbd88e62ac48f46a5115e39e8dba8d26d05c2e1c9abf9ea3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAF75106175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb344c56ff5a5204cc7c54fb47b424cd1d5d587f50f4995c220f5701370eb281. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/DEAF75106176.
Hodie cantandus est. Puer natus est nobis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae90f59f7270c085432a16d2c804db5ea6d713695c71ad0b39062552e8f20ef. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEAF75106177.
Verbum caro factum est - Quem aethera et terra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1c3abc6b00cb285ad77fa630f8db9de322f0c77d5fa9e6ad96126a18f0b2fc. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEAF75106178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c28f695d4a10048289ae13b4daab87e8c96af65dc1c8645a5cffec0d42c783. 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/DEAF75106180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27319ba1d60ca4bc912cc45fb985bfebef3c14ca65c53c51b0288bf152cdf2f5. 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/DEAF75106181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1831381fcbd947d156bf3842a014d20a94c97ed4af6d97660e5465e76165c7b9. 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/DEAF75106182.