The Leeds Festival Chorus is based in Leeds, West Yorkshire, England. It has 140 singing members in soprano, alto, tenor and bass sections. Presenting classical choral music of a professional standard
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 0x489286fb3f853931154426aefa7021224263e4dc5dd64423b6d361ed409b9ed0. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/deaa6557-f180-4b87-ad3a-f948f501abdd.json and https://artists.proofprofile.net/proofs/artist/deaa6557-f180-4b87-ad3a-f948f501abdd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rule Britannia & Other Music from Last Night of the Proms
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 0x4ec616c3a3a628d47bf1448a6485af06db2ccb7a709060e3a1815e90e7167309. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/HKI199718001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c65397937c6a6deb56cffe632e95d0356be861a45025f068d63b98b8c061d44. 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/HKI199718002.
Fantasia on British Sea Songs (excerpts): II. Tom Bowling
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf4e3bad147f4492c569f0e8c443ecc6022b624794f8a6875824cb4b8689db0. 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/HKI199718005.
Fantasia on British Sea Songs (excerpts): III. Jack's the Lad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef6d2e7150d82cfaf62737a735900efca4c0a4062915852cb840760a9620e7e. 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/HKI199718006.
Fantasia on British Sea Songs (excerpts): IV. Farewell ye Spanish Ladies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aefd2fb3d4e50b869e6df9c4d884a6a8ee943e618c4174eacb319590b657e2b. 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/HKI199718007.
Fantasia on British Sea Songs (excerpts): VI. See the Conquering Hero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc7c64f09d9be3c0030bf07ed32c014e0309cf47cecc1ec7ad42ddb37d7f138. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/HKI199718009.
Fantasia on British Sea Songs (excerpts): VII. Rule Britannia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a6865fd45114c7845a7f0b0ae5d2e4364c5de05c0b222c151d61be7f8b01ca. 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/HKI199718010.
Tam o' Shanter, Op. 51: Tam O'Shanter Overture, Op. 51
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40402cb18949229e0723eb4c5e48482e05f1042d803d9eb77be231d9f377e83a. 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/HKI199718011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb30b7ed16c6b06d506ce9ab3ccb21144ce3f9b4341669802aab406eff205fc. 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/HKI199718013.
Variations on an Original Theme, Op. 36, "Enigma": Enigma Variations, Op. 36, No. 9, "Nimrod"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1b8d9570aec2755fc093d9e14ad1e0871e7b88b063a2420c4d6dacf6c2b9eb. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/HKI199718003.
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
Fantasia on British Sea Songs (excerpts): I. The Saucy Arethusa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f44c5d9ddbb60c20d75185b522b22cf3b7ddd1bd0b49b5672c1c457b50fd77. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HKI199718004.
Fantasia on British Sea Songs (excerpts): V. Home Sweet Home
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afa15a4c13d1a702ec47859bd6deb5d7e33773060eea4c3451e0727408ede81. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/HKI199718008.
I was glad when they said unto me (Psalm 122), Op. 51
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb15f84b8868f3e552c0131a5906913c80f47470682c1613ccef6630142a1ffca. 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/HKI199718012.
Military March No. 1 in D Major, Op. 39, "Pomp and Circumstance" (Land of Hope and Glory): Coronation Ode, Op. 44: No. 7. Land of Hope and Glory
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aba94fcb1e7fb0e7abfd7577bf223a88f503a0acb9d9c0bdbb723c617b05c32. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/HKI199718014.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Part I, Hymnus. Veni, Creator Spiritus!
Mahler: Symphony No. 8 in E-Flat Major "Symphony of a Thousand"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215be1143d4ec242f3c362a533965304f4a58f5849150a99f54f3865d3c9ae8d. 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/USSM16601161.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Alles Vergängliche (Chorus mysticus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b5b03669579eafe99eaf11a8b09a666d2fc475a251d60ca9e5ef70d3809391. 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/USSM16601192.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Imple superna gratia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08166a03882969f412cc56b48645ad2267dddd905bad60d476977c4e76188153. 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/USSM16601162.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Waldung, sie schwankt heran (Heilige Anachoreten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ffff0b676fb3a3e23a417a24d9357feab11270f57d26ad7ddb54c5e458d85a. 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/USSM16601171.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Infirma nostri corporis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57326d1a53f7264032aba30ea0277b97ae7d1b5aa2cb49bdbc23f24a87f1be75. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/USSM16601163.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Accende lumen sensibus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fa8ceb87de0c494c72acd869079175a48a9d7e0f16f4d7b9e066814343518c. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USSM16601166.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Qui Paraclitus diceris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52055f52c6c32d90983f7a69f62a877de9b187f92734527efe31a238da041ea. 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/USSM16601167.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Gloria Patri Domino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed075f0cd91da259f50bd00b774a2b884c3baec3520ba5034136fde57113f2de. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USSM16601168.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Blicket auf zum Retterblick (Doctor Marianus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e599087dac5816c876872f67f03a10c4f1c94c9ab17df63d714b75839877fa. 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/USSM16601191.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Gerettet ist das edle Glied (Chor der Engel und Chor seliger Knaben)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5338f585563b43fcad6d5668bd5fb213a285836b6a1341c24980d8cd330e4362. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USSM16601174.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Jene Rosen, aus den Händen (Chor der jüngeren Engel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae29d72e69cdd9e52d8361bf714ddf08c6bd276559d0b48e361b405c548bcdd. 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/USSM16601175.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Uns bleibt ein Erdenrest (Die vollendeteren Engel)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698761c3ae0660165c2c08c1422e367aa0ccb43afa7de6a8d4ff86d527f3f134. 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/USSM16601176.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Jungfrau, rein im schönsten Sinne (Doctor Marianus und Chor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173d926cf104039ff6a4311199dc6397d7ecbed374408dbf086b75ba5774d438. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/USSM16601180.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Dir, der Unberührbaren (Chor) - Du schwebst zu Höhen (Una poenitentiem und Chor der Büsserinnen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09af99743f29b92440c35ff0292802e75f3afef5bdeefa721014b20009d5618. 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/USSM16601182.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Er überwächst uns schon (Selige Knaben)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdbc225155690d804492228e439a4a714690e971d510f8ad181ad0a608f6a3d. 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/USSM16601188.
Symphony No. 8 in E-Flat Major "Symphony of a Thousand": Komm! Hebe dich zu höhern Sphären! (Mater gloriosa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398ae06f8dca9b9eca740faf6e15ff36b644e04733c51c46bc760cf18cbbc36b. 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/USSM16601190.