The Ambrosian Singers are an English choral group based in London. History They were founded after World War II in England. One of their co-founders was Denis Stevens (1922–2004), a British musicolog
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 0x029bf70ac850e3e4c9cf01603ead2a4f065c03e44f9e34501d2291a4d0ae298f. 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/c42fcb23-4901-4fa8-99d9-ed9f7e3bf2c2.json and https://artists.proofprofile.net/proofs/artist/c42fcb23-4901-4fa8-99d9-ed9f7e3bf2c2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x867c363d724d76b4a793d212ad828f8a2f8e98e655e1c8b33ffd210a2cfba31a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401310 — a six-check JSON result.
I Masnadieri / Act 1: "O mio castel paterno"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ca9a4d2f2b9a448ef85cc6c7286ec62bfdb54664a5b488166c65eec0ac2bcd. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401312 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da093787977ade974a87361a8cc161432983578207b1a60b907488c923ecb34. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401313 — a six-check JSON result.
I Masnadieri / Act 1: "Nell'argilla maledetta"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a60cc506a65126df77929ef63dee56bdf653f2ce68dfa8a15447ca70bd170d6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401314 — a six-check JSON result.
I Masnadieri / Act 1: "Vecchio! spiccai da te"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37eb8ebd7bca27cb67951290abd9bdac6d71cec32602f37b37cbcf105368007d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401315 — a six-check JSON result.
I Masnadieri / Act 1: "La sua lampada vitale"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aa63c19bbbc924a4557ca7868bc91725983622390737de7a0d4fa9e5f80b45. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401316 — a six-check JSON result.
I Masnadieri / Act 1: "Tremate o miseri"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93de5d9c6cd663c4d2b66ed581fe11118e880865f80c1a633db2bcd8718b2a28. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401318 — a six-check JSON result.
I Masnadieri / Act 1: "Lo sguardo avea degli angeli"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84181f6b42ba49da51436eed60b5b5a219d6ce2bbefa60e171c5e47d2a9aeb9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401320 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70332f7530318a55a04b84ecf95044295f6865aa68097fdd7808e281405d0e59. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401321 — a six-check JSON result.
I Masnadieri / Act 1: "Carlo! io muoio..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66cf9955bfe6d9502f6474efc79e45bee28a363c807f438f46d064cd084ba7c7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401322 — a six-check JSON result.
I Masnadieri / Act 1: "Sul capo mio colpevole"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693e4523017a16a7dda98cac653c85a0590bee843de734b2282a83d572251cf0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401324 — a six-check JSON result.
I Masnadieri / Act 2: "Dall'infame banchetto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47358e0ab6297bb54e4befd7721147371a71d936a960170bd0439a0cccd5e6bc. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401325 — a six-check JSON result.
I Masnadieri / Act 2: "Tu del mio Carlo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b91d7ab4e3509500cb8bceb148f910b0e566e31ee932664e59add81c9e25fd2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401326 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c52f635c7559f054ebea1b1a83a6b2f278c66e52ce3c62176c278befb6e6a04. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507401328 — a six-check JSON result.
Handel: Messiah, HWV 56, Pt. 2, Scene 7: Chorus. "Hallelujah"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8832602c32f968b83eca5f0a4493b675ab8d7b56b3fa174c47e6f9f3872616. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9703282 — a six-check JSON result.
Handel: Messiah, HWV 56, Pt. 3, Scene 1: Aria. "I Know That My Redeemer Liveth"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc373a40fd25f9caa090b2b809795d7a6ba5ccd777031d724ade84f590b71895e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9703283 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618004ee056b928ca258597a404a50751bd137990c916703140704877ca7c5d6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8703055 — a six-check JSON result.
Wagner: Tannhäuser, Act III: Gesang der älteren Pilger. "Beglückt darf nun dich, o Heimat, ich schauen" (Chor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f96b0454ed5bcde53337e7196d7fe7c70bc2046b670832c192ecc70883bccc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA800115333 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8890ca85891974348fd1a507a2af29398aae60707b06ad97e91ad71b60952646. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8901252 — a six-check JSON result.
La traviata, Act I: Libiamo, ne'lieti calici (Violetta, Alfredo, Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a8589463141ec1e5f75a79365ba2d2d991dbeeb78d5796df3f3a5024125c6b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809203339 — a six-check JSON result.
Klassik 100 Meisterwerke: Klassik die man gehört haben muss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8832602c32f968b83eca5f0a4493b675ab8d7b56b3fa174c47e6f9f3872616. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9703282 — a six-check JSON result.
Handel: Coronation Anthem No. 1, HWV 258 "Zadok the Priest"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1be429a8ea296b4d4a6eadc0ad2d36a7efd5f0040fe6d8402118b9d9fa6e59e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9400014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40c06a60989d55b835bda478c7952ec7e9a14ffa4360f1d2d4f2f2568e96f3a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC7700030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32009af723589af28ea45695c6107f0a15a4d69d03a7609b72ac6e739b470c8c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC7700031 — a six-check JSON result.
Grieg: Peer Gynt, Op. 23, Act 2: No. 7, In the Hall of the Mountain King
The Classic Experience - 135 of the greatest classical tracks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311bfc5e3cb5c9b8b7d2f7ea29fcf94e9ee7c1fae6176e049d480612f1596856. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8802155 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b5ae28dfbd00d968eb545528db8c208fe02990047ccb8bc89601559ecfc47f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077110081 — a six-check JSON result.
Messiah, HWV. 56, Pt. II Scene 7: No. 44, Hallelujah (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0c3b7353fd3c4821e8e6119216de635c02b262791f13d9e0f7101ccf39af74. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8806467 — a six-check JSON result.
Carmen, WD 31, Act IV: March and Chorus. Les voici!
Dies Irae - The Essential Choral Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2f7f8ef124645310f40de15a12594e2c55ae04b5c9a0e5ffde7c1c5178f7bc. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057730160 — a six-check JSON result.
Messiah, HWV 56, Pt. 1: No. 12, For unto Us a Child is Born (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cba8955cb874b5ef6f91055e95651324e41c28dfa71eb78ac1eae94e3618431. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8703021 — a six-check JSON result.