225px|right|thumb|Clare College chapel The Choir of Clare College, Cambridge, is a mixed-voice choir whose primary function is to lead services in the chapel of Clare College, Cambridge. Since its
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 0x60c443053fb591f44bce0af0a40500ac7f0c3f28d865e9332359c0284ef8aa60. 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/01f045e4-04f8-454b-8a72-a0ceaaaaa4ac.json and https://artists.proofprofile.net/proofs/artist/01f045e4-04f8-454b-8a72-a0ceaaaaa4ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xd5b22c3e888cdc46c12734d5c8b10c25bab122a30d0aed089c4e030bbce00f8e. 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/USHM11665317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2b1ed990ed13aee75da6f347bd120b745742327c5507b403c332f7a1289b29. 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/USHM11665319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfb443d273dd7ab903d979127e38948b42cab4ec9acc78de4744c3ed2a4058e. 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/USHM11665320.
O worship the Lord in the beauty of holiness!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3580825ae9d5757fff3b521c05644a7e0ee24a09372d67b44fa9ef7f54de10. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM11665302.
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 0x4cff45bf0ae1d6bf849563c70e2048eb47d6776dd2b7c910681993669bf1abfa. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USHM11665303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4991eb9f6e338e98d06d3dec0cbedc6a6c242efec09ddbfdb97a3e8444fd5bc. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM11665304.
Requiem: Music for All Saints & All Souls (Bonus Track Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8188b0a9dfb2e92e19315c49e2925151a88f1f19c9e0f1ec8f92eb56a65cb352. 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/USHM11257901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb37625adace6803e6bc96348cc370c6b25fca84b5439b20cb612b01e82f884. 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/USHM11257903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719eec1e69bc07d37bd3a2647b99cfd02d1cd52be15d32a496e578577c59fa02. 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/USHM11257910.
Wie schön leuchtet der Morgenstern, BWV 436
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b593429486120b2eef3f63562be674cbc84151f1091f0a9880dd9aea4b2bcb1. 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/USHM11257913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3b24e210aa038ee473becf539f1736f430f9000d75c5cae5f450e0233ea4c3. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USHM11257920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2483c395d12102a64ef039f27e641ecc625f02cbfdae39938bc3f136182e0227. 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/USHM11257923.
Rutter: Gloria - Bernstein: Chichester Psalms - Poulenc: Quatre petites prières
Gloria: Gloria in excelsis deo. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda39f5539e12148abf31175dbc8d4caf5d98b1b3e80f6a1c3eadfd61c903ebbd. 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/NLY330900747.
Gloria: Domine deus, rex coelestis. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9f25b792fbbd5a5784ce2b8d33e98c61266c52a3a04d8b0bcdc1b50a44f215. 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/NLY330900748.
Gloria: Quoniam tu solus sanctus. Vivace e ritmico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c8d669ba2ed5f460ef8ed069d730df1f46a3900915dbd49e61382215e169a8e. 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/NLY330900749.
Palestrina: Cappella Giulia MS Baini II: Ave Maria a 8
Palestrina - Twilight of the Italian Renaissance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509f5d5d4545521c8c43c39fe89d727cc63649418e3d373b932cc81b3832f447. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBAYC9601790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91dd0624f6784935b7fd4d993bd2321b0fb67a1871f8ff0a81a0bb7d43c67d9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBAYC9601791.
Palestrina: Missa "Assumpta est Maria": I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea790c8a1ff906116a72f209134845932548ef696c242f1b35d99b5afced7fd. 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/GBAYC9601782.
Top 50 Classical Voices (Most Popular Vocal and Choral Works)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae98e5462df4598f2f52cec810a5ad5103f65bd6e2944af1379c7e984ecb53fd. 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/NLY331308765.
Palestrina: Missa "Assumpta est Maria": V. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6cff37497293046597952c40d35d727679f9182922bc3ec61d08cb26233cd6. 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/GBAYC9601786.
Palestrina: Missa "Assumpta est Maria": II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6935f1a9fedeed74202d02888ceb6299393f33ef880ae98a7578bb95c6a2bd. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/GBAYC9601783.
Palestrina: Missa "Assumpta est Maria": III. Credo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6282338f4411fc3d02c03276b1c987085deed08ef4605e0e9684189953b69ccd. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBAYC9601784.
Palestrina: Missa "Assumpta est Maria": IV. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0d12f9ae7d7d8e6b9d74f2e4e1c8d77ff27d01988750aa5a899b7f03b456d2. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/GBAYC9601785.
Palestrina: Missa "Assumpta est Maria": VI. Agnus Dei I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a7c3f155d3125967cd50132dc7e8bea876888d07736ee19f705c47d0ce5d86. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBAYC9601787.
Palestrina: Missa "Assumpta est Maria": VII. Agnus Dei II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e8d67d708695ef80820bdbc5904f2b5cd78723ea645179e95a0164fa033f76. 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/GBAYC9601788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe913ecc4e3116ff149df597ad909286eea868bcfbf8312d2010f55496c65dd7e. 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/NLY331308753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd47a7dc6ff23f9c73bf81f1ea7d704dbfedc627015994d8c2a08e98ecc04df5. 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/NLY331308754.