The Houston Chamber Choir is a professional chamber choir based in Houston, Texas. It was founded in 1995 by Artistic Director Robert Simpson. The ensemble annually presents an eight-concert series of
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 0x61b42d1f1602e7583e7d91bdd466404815657dc9f7f323b4cfc7fe0602c44c76. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e62bcd3-0503-4387-acbc-3a0ba9e13d6a.json and https://artists.proofprofile.net/proofs/artist/8e62bcd3-0503-4387-acbc-3a0ba9e13d6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Quatre Motets sur des thèmes grégoriens pour choeur a cappella, Op.10: I. Ubi caritas
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 0x39745f39162e4d5484f385fa28456369cfb7eaca8d69bbd03c6f537a011aa924. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBLLH1957106.
Quatre Motets sur des thèmes grégoriens pour choeur a cappella, Op. 10: III. Tu es petrus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab177297e4401d2dd0ce89ad87a935dc6491a857519a48447ee8ff35b37b050a. 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/GBLLH1957108.
Requiem pour soli, choeurs et orgue, Op. 9: I. Introit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcaa8f7fb526d6cad974a0ef67bea6ab3c3fc937771182e1c5f4a6f25ff03e9. 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/GBLLH1957111.
Requiem pour soli, choeurs et orgue, Op. 9: II. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115e5ed67005b965b474bb75acc37f65125d84b2f16d4d1a71beeb5cac1d2d19. 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/GBLLH1957112.
Requiem pour soli, choeurs et orgue, Op. 9: VII. Lux aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352bb5bdf5fa8f35f99fba68bf70eaa4507845f27f18941e143b08117991e518. 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/GBLLH1957117.
Requiem pour soli, choeurs et orgue, Op. 9: VIII. Libera me
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec8488b5ce6f06a1319e765700b52aed631044a4795efe36060e2cc8166f475. 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/GBLLH1957118.
Quatre Motets sur des thèmes grégoriens pour choeur a cappella, Op. 10: II. Tota pulchra es
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca74f93815c5c60f9fcc6a7f5b834d65b5474abb600ccbdf6adff1bcf528916. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBLLH1957107.
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
Quatre Motets sur des thèmes grégoriens pour choeur a cappella, Op. 10: IV. Tantum ergo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc064a3ee828bd1547a24c126aa10ac1c8c9a06c79ab3dc1d51dad475ca7d034d. 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/GBLLH1957109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427012c3903f5442d4fe253f9012a5eea63afc2c75ed6e6131452d6d5c4cec78. 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/GBLLH1957110.
Rothko Chapel - Morton Feldman / Erik Satie / John Cage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d447bdb9db5b38955d130913c382b8656e80bf267407a8f4733f568972411d2. 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/DEB331237801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c58d565cbbf2f1e44ee5aeed18b1141045d7b017ff369eb3cddecba9a52d13f. 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/DEB331237802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6b2eb70e31324ed0d1c95adce67755f1a442d0ba1f9a14757886d6acd08432. 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/DEB331237805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8babbf21c82e801bb5a08e13d110331aff27a4adb9f6d167800825bb17af4375. 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/DEB331237810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9785bccab315afbb510e66957b38ca273ed81861832c54b40b64f5b6c71e8648. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEB331237803.
The Blue Estuaries - American Choral Music
Colonna: Psalmi ad Vesperas, Op. 12 (1694)
Ravishingly Russian: Secular Choral Music 1874-1994
Quatre Motets sur des thèmes grégoriens pour choeur a cappella, Op. 10: I. Ubi caritas
Messe “Cum Jubilo” pour choeur de barytons et orgue, Op. 11: II. Gloria
Circlesong: Introduction: Beauty Before Me / We Wait In Darkness
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018684002d3d284e4d8942f51e907d0d4bd82de3e7ccc244cf53ccf33485eac9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-21T17:14:57Z), 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/GBLLH2270301.
Circlesong: Part II, Childhood: A Child's Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5abca2554bb2d6b3f818d6239ba991375dd9550977810864d47026d1ff0b4028. 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/GBLLH2270305.
Circlesong: Part III, Lover: Over the Wave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9066dc0a190f2be20c3b22a430c19fd5606b2b7e37956a88618a53f1c6d49c. 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/GBLLH2270308.
Circlesong: Part IV, Adulthood: Summer Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d7d9bf01b814f3830aca0d4ef9c3417a4902c086d05ccba5e26696eaf0d506. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBLLH2270309.
Circlesong: Part V, Middle Age: O Great Spirit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ee9852631d09a958eef947ee9ddf6c33d297e05bb93624b4b94de6a3b47de2. 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/GBLLH2270310.
Circlesong: Part VI, Old Age: In the House Made of Dawn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5d6e3a3cc79766bbb82fd588389c1f6ff5fd358d74f57db9fd860cb3c89849. 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/GBLLH2270311.
Circlesong: Part VII, Death: Farewell, My Brother
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf424a1fab7485d6c0fa3576a4f34e006a5aac709468ccef83dd529741f88d87d. 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/GBLLH2270312.
Circlesong: Part VII, Death: The Sun’s Beams are Running Out / We Wait in the Darkness
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8117b6bc0ac316cd3755531fd9da5274667acd3c62d6bcb50868ec02872f6d78. 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/GBLLH2270313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5736c3ae6d65688ec18bd7ac166fa58b553417bf72fdf67fb44a3fe70007e7a5. 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/GBLLH2270315.
Circlesong: Part I, Birth: Song for Bringing a Child into the World
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b80a58e73a178dbcc56d420c5c4a411540d35b071d35b582cc6f0fff6c0437. 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/GBLLH2270302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284f0868731c55c3e04333393e5127475c63571535f0fe3afe0f5216217b4d57. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBLLH2270303.
Circlesong: Part II, Childhood: Yaqui Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283c0645a0eba71f263bbcae8f2dce756a1f7cefa47f9baca46577cc74e69564. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBLLH2270304.
Circlesong: Part II, Childhood: Give Me Strength
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65edce96fdb5c2cb041caa4c186df203374079193fcdb0043c58fed44c99d094. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBLLH2270306.
Circlesong: Part III, Lover: Chinook Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f96b82b3d247d39e41de3811125659b8451b0b71df7d8981f46aae8256adc78. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBLLH2270307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44cb603f6d51e2ff8373cd9c7f120aee099dd7f4023a07c1413caafbf9a8bee. 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/GBLLH2270317.