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 0xebc63040483ab0b22f2c223c8dcfca1aa213270fa5970ee7a0c9b84c31c2cda8. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7975b550-551a-4b43-ac36-95fb92b15076.json and https://artists.proofprofile.net/proofs/artist/7975b550-551a-4b43-ac36-95fb92b15076.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hindemith: Complete Music for Cello and Piano
Hindemith: Complete Sonatas for Wind Instruments and Piano
Sonata for Bassoon and Piano: II. Langsam-Marsch-Beschulss, Pastorale. Ruhig
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 0xac9a659ef51174d0867b190fed114983827e04f8d81240b5990c2fa178b62ca9. 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/NLY332002830.
Sonata for Clarinet & Piano in G Minor, Op. 29: II. Adagio con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c99b4ac9fc5ee1151fb7751f1a84f3bd9ea348588da137848e0412bf377f935. 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/NLN580592913.
Clarinet Sonata in F Minor, Op. 120 No. 1: II. Andante un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a923792e716c4531d1e92cd3f72f670a478380aecef1ebcf42810fee8ff064. 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/NLN580579911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbce6ef3ccaad27e06d06445b5fa089e8073cd1435fdad8d3f38e646717e350a. 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/NLY331502861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac390858582c3ce250b557a1e58ffda06ff15cd3579587e8e1d398a39679d076. 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/NLY331502862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad754be09b1feb7d93c3fd124365023efcc56440d8851cff710663a3be54c1a6. 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/NLY331502868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2037fdd2cbf2f842f99b123beb0db91095d4146e15b40eb8c069be5a136b63b7. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NLY331502871.
Spontini: L'Opera vocale da camera completa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88b5977a53eecc72ffad2c1ba2b20a8f723d7bbdbe5d354f17ba3164bea0bc0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLY331402840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48521790028a522098839c205399177e52fb4b67164397d1b7684cce321735d. 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/NLY332202349.
Falla, Albeniz, Montsalvatge, Mompou, Saint-Saëns: Joyas españolas (Spanish Echoes Of Canciones and Baladas For Mezzo-Soprano And Piano)
Debussy: Musique de scène pour les chansons de bilitis
Chansons de bilitis, L. 90: I. La flûte de pan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6896537a71428b4fc39b3cedf58a19ad36e7ea42c09645f27e10070a5b652d13. 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/NLY331802212.
Jolivet: Complete Chamber Music with Piano
Grave et gigue for Violin and Piano: I. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4baac1401d1b956de8e6f46477405ab5450fada0728f32b51e25968450ffe077. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLY331703375.