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 0x25732bce812cdf4f60c1a8527b5451b614ca9846ef0d6e0fb0da4d890b1b1c3c. 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/bd8cb8f0-74cc-403b-b358-a155316415c1.json and https://artists.proofprofile.net/proofs/artist/bd8cb8f0-74cc-403b-b358-a155316415c1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ropartz: Musiques au jardin / Jeunes filles / Nocturnes / Scherzo
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 0x33c3843d430f121ec3aaadda7fd2c7176dc2838ca239c7ef859998db71342482. 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/CAJ720225509.
A Guided Tour of the Romantic Era, Vol. 11
Dupont: Les heures dolantes La maison dans les dunes
Les heures dolentes: No. 2. Le soir tombe dans la chambre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bdd4bbe31f40780a8d60fa2307faab26885a8b37e8dfe5fdc60d29c4003f88. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/CAJ721154402.
Les heures dolentes: No. 5. Après-midi de dimanche
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a1dd06383fff2b087c712f06a638037fd9558843f1a0f4d2d2ae366dae0207. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CAJ721154405.
La maison dans les dunes: No. 6. Le soleil se joue dans les vagues
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae2feefe6801efc6b2deca79db5c58ca43ea811d86bf003f7fd0997086f4c9e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/CAJ721154456.
Catoire: Complete Works for Violin & Piano
Carl Czerny: A Rediscovered Genius (Live)
Éoudard Lalo, Paul Lacombe, Fernand de La Tombelle
Nocturne No. 1 en mi bémol mineur, Op. 33 No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0528cc565a372243de70500ae5751194cf8f84ce462639cbfb65ef28085d8b. 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/CAJ721446601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e1088432e7edbf6348055bfc9321dd7fe8aa06d483d684fad06b710a97ce20. 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/CAJ721446602.
Nocturne No. 2 en si majeur, Op. 33 No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4426b30f6c779c6aa6cdc71be4bca46762a71dcad8e654ac854e589ef538e01. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/CAJ721446603.
Nocturne No. 3 en la bémol majeur Op. 33 No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8568fe2304f139f77464c22f4faa7d3a3f10a743c038c586074c4850505b516. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/CAJ721446604.
Nocturne No. 4 en mi bémol majeur, Op. 36
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8b24be5981219704181a5b2419a5fb42c4dcdbba599765dfa33ee7db334e2d. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CAJ721446605.
Nocturne No. 5 en si bémol majeur, Op. 37
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae9775230b6b4a55f18ee64eecd8b217fd7813e67ef0d3c0eb55e96bed86962. 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/CAJ721446606.
Nocturne No. 11 en fa dièse mineur, Op. 104 No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d38b8ebd3864d4dbfc8373f1ee11587e62dcf9d6e1735cf3079eae72be6b1f1. 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/CAJ721446659.
Nocturne No. 6 en ré bémol majeur, Op. 63
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf26e9de27a9973d49f6765e0f86666a35acecc802f410db1ad7598ab2016eb0. 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/CAJ721446610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d9a7dee72b2f520d0b088f1b75567ef398f537509a8fb15300e3a3714e4832. 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/CAJ721446665.
Dubois, T.: Cello Sonata in D Major / Ballade / Nocturne / Melodie / Violin Sonata in A Major / Meditation Et Scherzetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa874b96a71eec5e4e48f7e9c4d039debb640f549c594514259811b7b5558ebcf. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/CAJ720638160.
Poulenc: L'histoire de Babar / Debussy: La boîte à joujoux
Lalo: Sonate pour piano et violoncelle in A Minor: III. Allegro