Michael Praetorius (probably 28 September 1571Praetorius's birthdate (and even to a certain extent, birth-year) has long been shrouded in uncertainty. However, Appendix II of establishes for certain
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 0xf245a06a6fcd4b7603e9b4ff89e57e517f7f0225db085b7ab40754384df038b6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e40918f7-41e1-4241-a65f-84d1c4ed16d6.json and https://artists.proofprofile.net/proofs/artist/e40918f7-41e1-4241-a65f-84d1c4ed16d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Yulefest! - Christmas Music & Carols from Trinity College Cambridge
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 0x8926957cc463a43ed4d28051a538009aeb600f603189d958d8fd16fa17171d7c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAJY1929905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea892cfd1a8eb98927905eaf512ddf1fea7b7fb8696bee4874cabb2db897361. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAJY1929918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceabf9c30fc40d2700e4536a9066a739e5451ad3a6bcabaf987c64810de5d51b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAJY1929921.
Quem Pastores Laudavere - Quempas (Perleberger Fassung)
Knabenchor Hannover: Michaelisvesper mit Werken von Michael Praetorius
Terpsichore, Musarum Aoniarum: Ballet, TMA 268
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d32f5925a62a10f74b947dbc1a571e2e3e30c6c986421fb2f098d6861d8cef7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEE472100065.
Voktett Hannover: Tidings of Joy (Weihnachtslieder / Christmas Carols)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eea264c670e29aa57bae09d8116ff184ce2b2d4d767ac17db0f06b5f3e0ccdb. 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/DEN422107001.
Michael Praetorius: Ein feste Burg ist unser Gott
Michael Praetorius: Gloria sei dir gesungen. Choralkonzerte nach Liedern von Luther, Nicolai und anderen
Christmas Vespers: Music of Michael Praetorius
Praetorius: Terpsichore - Suites Nos. 1-4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec05f0c207706862dd79cb462fa98a5450008b068db4ad87906f6d4d62763aed. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USA220810971.
Early 17th Century Dances from Terpsichore: Galliarde (1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04874f6b6c1f1c9cec9f5a0a25e724312f8c617a7afa0fdd0411bf382f002a3d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USNO10200954.
Early 17th Century Dances from Terpsichore: Three Voltas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640989782513ec0630e8af5114d966388c4eed587a9fde084dcf92dcb0e7e790. 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/USNO10200955.
Sixteenth Century French Dances:Basse Dance "Au Pres De Vous"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca6539b39a79c0289d0da74e413b857b59adc23dc5a068c1ca10cd509d2ae58. 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/USNO10200967.
Sixteenth Century French Dances: L'Homme Arme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0001d975656f380334e633002b6a005e28b024efa8c7806c8ca1eb429385d37. 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/USNO10200970.
Praetorius, M.: Puer Natus in Bethlehem (Renaissance Christmas Music)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2b2429b23caff9dd1f94a68d949b00c183987b91878155b5efc906cc3af23d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEAEK9935070.
Praetorius, M.: Choral Music (Advents and Christmas Music)
Praetorius: Dances from Terpsichore, 1612
Thomanerchor Leipzig: Weihnachtsliederabend - Es ist ein Ros entsprungen
Weihnachten im Mainzer Dom: Es ist ein Ros entsprungen
Avant-deux à Joseph Chataigner / Gavottes
Es ist ein Ros entsprungen (Christmas Piano Variations)
Es ist ein Ros entsprungen - Piano Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabb90ab464d35c7816b8d9da9d215311819833bbf3d9989b6f3cebba3bb0dcb. 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/DEPD42021101.
Es ist ein Ros entsprungen - Variation No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb5d744fd8262df54ff137cafd10f963680a8ee17b4662b493cadf5fda88548. 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/DEPD42021102.
Es ist ein Ros entsprungen - Variation No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831abcdf760ae12771cf39fe67ccd60616c2887c55ff9b77f934917f8c477ddf. 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/DEPD42021103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555603d995cf9b956c85de29b07bc2bccb31af2b4d9942e777f9244d0380c193. 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/DEE862301605.
O Holy Night (Cantique de Noel) - Orchestral Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683de3ecdf934c28b233a9fcc759e36234ac7e3213984642c33ad372c03d0aa5. 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/USSM11105286.
Es ist ein Ros' enstprungen (Lo' how a Rose e'er Blooming)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0d3a6479c2014d9fb7f9eda0a2d05ee0e7fbe34da31e8bbf5586e58f91ccae. 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/US2TL0923119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabea16c64b46800c0298380e996c01fa7a664873174d0c2150fd320f2404e7fc. 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/USB8U1035283.
Praetorius / Arr. Christophers: "Quem pastores laudavere"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f171557f26e7eaef3c43d0a65e48b8ae55c3398cc13d9b6837b096f0f8df75. 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/GBAYC2002095.
Lob, Ehr und Preis sei Gott (Die schönsten deutschen Kirchenlieder)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac68f6160ea960c47f8dce2a82d388c2f72157249c955b2cf7b3e45313e22539. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DES381312004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75279b4065429eaccc6339428c51fda05ec30d66ec12f84b60658569e2d6fb37. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DELJ81586160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e00c4e3f68bfd7e197c2cc8dc0a8fddc6327aaf6bdd329f2b6aecbd223dbf7. 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/DELJ81586167.
Ein feste Burg ist unser Gott: Luther and the Music of the Reformation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c6809854b09b1709aaede00751ea46bfd07e3072450f676d1b984cf50f84a6. 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/BER181637605.