The Regensburger Domspatzen (literally: Regensburg Cathedral Sparrows) is the cathedral choir at the Regensburg Cathedral in Regensburg, Bavaria, Germany. The boys' choir dates back to 975, and consis
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255d35c93960790f7872e8a845bd4f9a13a40d25ed823bd7d85a115df1a08fad. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45fcef0f-aeca-465b-bb31-2ab99ba7eed8.json and https://artists.proofprofile.net/proofs/artist/45fcef0f-aeca-465b-bb31-2ab99ba7eed8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ditters von Dittersdorf: Requiem - Offertorium - Litaniae Lauretanae
Benjamin Britten: A Ceremony of Carols (Britten's Centenary)
Domspatzen 2010 - Die schönste Chormusik der Regensburger Domspatzen aus der Musikstadt Regensburg
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79f5e06ebae2a9c063553cdd1d1d48dbc42f137ae58f7e2850b4aa5f93fc31f. 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/DEHC20833815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db89277c5150fa614bea6a2a3eb4cd276b6c9c3c58004c9315b7023bd9f6902. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEHC20828346.
Messe solennelle en l'honneur de Sainte-Cécile in G Major, Op. 12 "Cäcilienmesse": I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5e336b1a0d003b510f86319697f636c615eae95bf78073894a43f09a9e4a70. 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/DEHC20828349.
Messe solennelle en l'honneur de Sainte-Cécile in G Major, Op. 12 "Cäcilienmesse": III. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf4d4b53e019c616f15f18c18e5694bb2f3a6bb89b19a78af0e8fbeac0f22c2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEHC20828351.
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
Messe solennelle en l'honneur de Sainte-Cécile in G Major, Op. 12 "Cäcilienmesse": V. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abf20a7ba0e4af70363520c7d41015bbee76d70fa40847e493523479c462f74. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEHC20828353.
Bach: Magnificat, BWV 243a - Cantata, BWV 10
Stille Nacht - Silent Night - Douce Nuit
Weihnachtskantate "Vom Himmel hoch", MWV A 10: 1. Vom Himmel hoch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b4168a65870a8d40bbd5fe540f15e3954430a2f340f92a8aaf95588db37293. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEHC20834140.
Christus, Op. 97: Wie schön leuchtet der Morgenstern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65a75d24bbb85d1d4cda30ca99ee0204553c3d82b27bdbbff59dbc11590fd6f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEHC20834142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92493bcc0090cf8df416e9de371e2b2b3ed9f2bf5a5156e3a9e7ba8578dcab90. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEHC20834139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a03ef1fe086504d113549f2f48b365a817f270e47303754728ed125688963c. 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/DEHC20834141.
Maria Himmelskönigin: Die schönsten Marienlieder
Marienlied für Chor: Übers Gebirg Maria geht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3960d34d874da15b653f753c1e22a17d00bb2597a0d9f1da3c81863d53e666d0. 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/DEHC20828333.
Marienlied für Chor: Meeresstern, ich dich grüße
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8752e28ea17f4a3cd4437fb038e7a29617e89a654cb9bf876196cdf0ab251e. 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/DEHC20828336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef9199c0fe81a75a2733b5acf767eb6665c4725d6711f444a8c2db8419b768f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DED812470070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2296717ef941ca1e0fe6f2ffd9834e57ccc3bce8564df88e961cbce65915c9. 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/DED812470090.
Kein schöner Land - Die schönsten Volkslieder unserer Heimat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b78bb0b6d98961d69169f2d36d259d6a4998038cf3b1edf543626453cbeb46. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEF066100790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff966f95e7e64b14efbc3dd1afe1b501d9ee99429bd51d4c38d139384dc0f2c1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEF066511230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefd9b63f6ec8a228b2b49229f25f21939ba7249c3489dd0cbbeb3f68d056fa8. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEF066000200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c203744ec824d42bc98c02050c72f6c5562e995ec5f971546da3d43a56ea65. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEF066300780.