Schola Gregoriana Pragensis (English: The Gregorian School of Prague) is an a cappella male voice choir from the Czech Republic, founded in 1987 by David Eben. Their core repertoire consists of Gregor
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 0xa44da167d74442849552500829df2686a9875f588954b8880fd36df763a45e6f. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b371727b-bfcd-4fe0-8ac0-4c37fe3b6429.json and https://artists.proofprofile.net/proofs/artist/b371727b-bfcd-4fe0-8ac0-4c37fe3b6429.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Salve Mater Salve Jesu: Chant and polyphony from Bohemia 1500
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 0xf327dea906fea171ef4fe612d3b056b7410afafe0d8107c3023e23bfb1b004d4. 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/FR0O70810667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf287eb4448f38d3909191e157d711c41c4a2aa4ed56beb74bd4205340d903c26. 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/FR0O70810668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59abbd28550e8f5964e961fb7bad4d1ebebc3e0a372cdc7bbe79c57b4a00e9e3. 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/FR0O70810669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec80d90c3e3f7aa7c84ead2264551733148ff93be71c8873e51b1f367c9d906b. 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/FR0O70810671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74e4f9d1b7cd1000b0272e75d148d99ab8929f088e324a3e7d7f499c4d51e5e. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/FR0O70810672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1c84ec14a98e5e222b66f89fa4f1d4e31f085dbb26d67fbc6925a1b5293f98. 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/FR0O70810673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7059890f9b23c2604b0a60b5aa3e7c8d7f28894e2ebb4921a6d121676c6e3f59. 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/FR0O70810674.
Buoh vsemohuci, Christus surrexit vinctos, Chorus move Jerusalem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230352e7e8c7b7b4741036072016f4ee4854ab5ac067479a54199e7bbb80c871. 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/FR0O70810689.
Anniversary Series, Vol. 10: The Most Beautiful Concert Highlights from Maulbronn Monastery, 2007-2008 (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7760129b7957aec04b87dc45547c118b6433f57a263268601c4894e6b2a54be. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USB8U1800078.