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 0xd5d0f562d57d9c311bafe60ae3fce43a204afa697234701b70efb27bff4ac779. 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/f3479418-ebdd-4c50-824e-8932ea51aebd.json and https://artists.proofprofile.net/proofs/artist/f3479418-ebdd-4c50-824e-8932ea51aebd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Ave Maria in A Major (1860) (arr. J. Lloyd Webber for 2 cellos and piano)
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 0x464bf3233227703ca3e99e42538813de04e4d35c2f811af71446668e3b037adb. 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/HKI191331101 — a six-check JSON result.
Chiquilin de Bachin (The Little Beggar Boy) (arr. J. Lenehan for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa772f6cf916337a1ebac60a3c40280d099fb4e0ac94c039e3a78d96760e35d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI191331102 — a six-check JSON result.
Madrigals, Book 7: Interrotte speranze, eterna fede, SV 132 (arr. J. Lloyd Webber for 3 cellos and harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f60844c841c31ef205df7146f5bbcb9ab161f042571e2bd6f8bcd174dff8db4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331103 — a six-check JSON result.
The Gadfly, Op. 97: Prelude (arr. J .Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0444412ef88b5c43ee992cfc37b7d7d15d54f82add0c4b063b407acb44ef9664. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI191331104 — a six-check JSON result.
Choral Hymns from the Rig Veda, 3rd Group, Op. 26: No. 1. Hymn to the Dawn (arr. J. Lloyd Webber for 4 cellos and harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527cd7b717e291155c00cd6e8b362757f27f7a7020e9b9eb317ef075c24fc867. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331105 — a six-check JSON result.
My Lady Greensleeves (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56595d0897d2bcf4032f9392366e1b6a0ada029fea18dcbf489a7320be93eab3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331106 — a six-check JSON result.
12 Songs, Op. 48: No. 1. Der Engel (The Angel) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56500b2dca5f03fbb908861b9a89acc37a915a6c2c8d501e4ecb6c94aa8386d4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI191331107 — a six-check JSON result.
Moravske dvojzpevy (Moravian Duets), Op. 38, B. 69: No. 3. Kranzlein (The Harvesters)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5994b5b9cc9b3cfd4de6483009e2a6bded2fdfbf36ed2d0019ca7964298bbce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331108 — a six-check JSON result.
Moon Silver (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2043227d242b80ea01755d38204ac8678496bcd1224b3a698145a58f5ce8752f. 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/HKI191331109 — a six-check JSON result.
Sommerruh (Summer Calm), WoO 7 (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5dae844665af1fe4b1c38f9907053b9a099d5e06cc8a62598d726877da9ff6. 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/HKI191331110 — a six-check JSON result.
Stabat mater: Stabat mater dolorosa (arr. J. Lloyd Webber for 2 cellos and harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cc3937baef9ee6822a90700574a93e4d677aebda3d4375a4880829e2ace319. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331111 — a six-check JSON result.
Moravske dvojzpevy (Moravian Duets), Op. 38, B. 69: No. 4. Schmerz (Autumn Lament)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5b9c217efc76a189814d300cf09bff53ca6625ba5b13f4ba05a6967f8dbc4a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331112 — a six-check JSON result.
Si mes vers avaient des ailes (If my songs were only winged) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1c2ef433aa735b212f9a4550cea42b2e6aa74eef604d739d48ef60ea582d7c. 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/HKI191331113 — a six-check JSON result.
6 Choruses, Op. 15: No. 4. Zadremali volni (The Waves are Dreaming) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338be3318dd9100f6192517a2d91615e80e2b3361a2b6c0a2ba841b812e2f57f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331114 — a six-check JSON result.
Lost is my quiet forever, Z. 502 (arr. J. Lloyd Webber for 2 cellos and harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7664b2c2f9d8d0a97b4a2f03df914755344be72a724bc30b1d8913f87de596fd. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKI191331115 — a six-check JSON result.
Moravske dvojzpevy (Moravian Duets), Op. 32, B. 62: No. 8. Skromna (The Modest Lass) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e65813e6d610682035d7f6c00e2421ba3ff3ad8db128814372116be7af830a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331116 — a six-check JSON result.
Mädchenlieder, Op. 103: Madchenlieder, Op. 103: No. 4. An den Abendstern (Evening Star) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820a04e98fd533bc94e00baed7c4dd9711a954ea55aed0268e5551c97a1393f8. 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/HKI191331117 — a six-check JSON result.
Sketchbook, Op. 2: Oh, that we two were maying (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e84d2f257c9028c2e260e32e0b7ee800fc75282f517fe357cc31c6119f3c041. 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/HKI191331118 — a six-check JSON result.
Sweet and Low (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ca8b143a0cc5d0a86892f5390de2ddc6c8ebdcd4e79d26397c5d2b6a5944fd. 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/HKI191331119 — a six-check JSON result.
Summer Sunset (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb349cd2c1334da3f61eed674d10e494d0c95e83c7ce3b7f68767c2c2b62480a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191331120 — a six-check JSON result.
2 Wiegenlieder (2 Lullabies): No. 2. Estnisches Wiegenlied (Estonian Lullaby) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37dac88e6a36e4272a7f244cdf79bf74ae1d4988857aab85301d1753051ec63. 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/HKI191331121 — a six-check JSON result.