Thomas Quasthoff (, born 9 November 1959) is a German bass-baritone. Quasthoff has a range of musical interest from Bach cantatas, to lieder, and solo jazz improvisations. Born with severe birth defec
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 0xcfc68a7536539c8c2359c10618433241b7d6d156f7465114ba4973aa386077c7. 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/6bb10871-8aed-4a84-8ba4-deadc5e74ab1.json and https://artists.proofprofile.net/proofs/artist/6bb10871-8aed-4a84-8ba4-deadc5e74ab1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Thomas Quasthoff in Verbier - Vol. II / Live
Schwanengesang, D. 957: Aufenthalt - Live
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 0xd7b639e2e2edc844a5e5b1faa336e925d4c3446268c52a26dabd29c04c1bf443. 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/DEN962335905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf912614ef168602ca0a3e11039c78909f4b4854a900163b5e30c33200ef6ab22. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEN962302960.
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 0x1c32b20929167112ab7d26c5eb83e88be3c64cb4dec9f9c77d6134df89329411. 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/DEN962302990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde92216992d30967e53b2dfad33cc449d0b8bb0e4f526d5ff4fdd182e5cce2af. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/DEN962303000.
Don Quichotte à Dulcinée, M. 84: No. 1, Chanson romanesque - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65dd561a6dd7a3a29f0b30371e2482a3ee2f3f8afbe11b0f331b8735521bc4b. 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/DEN962303011.
Don Quichotte à Dulcinée, M. 84: No. 2, Chanson épique - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc03194857f5eb27202db3d34411ea76a47e5f0a6ae8e312652415470cfc68f9. 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/DEN962303012.
Don Quichotte à Dulcinée, M. 84: No. 3, Chanson à boire - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86660543adb10734d290f9ac1b407f7c10f795d828ccf4a7a51990181bae3062. 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/DEN962303013.
Die schöne Müllerin, D. 795: No. 2, Wohin? - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2aebc7c12ad76674eba386e839020a46bdee4e85f1ea806bb739663c7b62c4d. 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/DEN962335802.
Die Zauberflöte, K. 620: Der Vogelfänger bin ich ja
Württembergisches Kammerorchester Heilbronn
Ich mag keine Klassik, aber das gefällt mir! - Für Kinder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa769bbb0d2549c14c25cad87663aaff59dc84da7e789418216a79bfc4afed12e. 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/DEE479400167.
Beethoven: Fidelio, Op. 72, Act 2: "Wer ein holdes Weib errungen" (Chor, Florestan, Leonore, Marzelline, Jaquino, Don Fernando, Rocco)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7a97123540068389462d34a26ef25128e6e2f915fe7ad787f08c5b1d0e76dc. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBAYC0301830.
Beethoven: Fidelio, Op. 72, Act 2: "Des besten Königs Wink und Wille" (Don Fernando, Chorus, Rocco, Pizarro, Leonore, Marzelline)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a68a4a435765bcb4de9942cde16b0826a5e9303054ab2c15720b1d36e3c1e6. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBAYC0301828.
Beethoven: Fidelio, Op. 72, Act 2: "O Gott! Welch' ein Augenblick!" (Leonore, Florestan, Don Fernando, Marzelline, Rocco, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2eb1bdec491a57bda8ce3ecb92cf0d4914a04671dea106d0a3b08e71d29570. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBAYC0301829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e6ce3ca995a1547dcf6159cb2aff3244fe4a0ef4057a11e41c12fa3264c4e7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEA891300373.