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 0x8217eb51f135cd0f15f031027701d6513e6d36e59dfe25898dd117d683c9fb50. Chain 2 (Bitcoin): anchored in block 953860 (2026-06-15T23:55:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03fb00e3-dc20-4c4e-bf50-1112249d80b4.json and https://artists.proofprofile.net/proofs/artist/03fb00e3-dc20-4c4e-bf50-1112249d80b4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Gubaidulina, S.: Deceitful Face of Hope and Despair (The) / Takano, M.: Flute Concerto / Beamish, S.: Flute Concerto, "Callisto" (Spellbound)
Gubaidulina: '...The Deceitful Face of Hope and Despair' / Sieben Worte
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 0xe47ded98f15cbdc5b118c9293e29649d5c6b06e10b72a46aeb95846b7cc03ff5. 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/SEAEO0649010 — a six-check JSON result.
Das wohltemperierte Klavier, Book 1 (Arr. for Accordion): Prelude No. 1 in C Major, BWV 846
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c17f03611dec90a02dc19779adacbb799626ed941fdbf8cb43c832f0a187f9. 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/SEAEX1617010 — a six-check JSON result.
Das wohltemperierte Klavier, Book 1 (Arr. for Accordion): Fugue No. 1 in C Major, BWV 846
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3524dfe9872df8ba61a6a3ca475fd809c7c5579912eceb8615ee20ed4a5fdc3e. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/SEAEX1617020 — a six-check JSON result.
Das wohltemperierte Klavier, Book 1 (Arr. for Accordion): Prelude No. 2 in C Minor, BWV 847
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c26f6116ba2ca3e96bd1cd07cef6a982bbbc6bcb4dc8282ddc16c7f4f1e829. 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/SEAEX1617030 — a six-check JSON result.
Das wohltemperierte Klavier, Book 1 (Arr. for Accordion): Fugue No. 2 in C Minor, BWV 847
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30349100ca61104b95dac54631bc68c162ca1b58d651210eeab254133f4faa35. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/SEAEX1617040 — a six-check JSON result.
Keyboard Sonata in C Minor, K.11/L.352/P.67 (Arr. For accordion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4098989b652e544fb99620d27b1b22de48cef1a841a0cb2b749188e25cee5e72. 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/SEAES1104030 — a six-check JSON result.
6 Moments musicaux, Op. 94, D. 780: No. 3 in F Minor: Allegro moderato (Arr. For accordion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690b2420fcc3c5284764d821199fbf9f451629e98aa05e2752e32875c7951264. 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/SEAES1104060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93757c88be5f09aaff8f3361a1bf770f8e0e236ceaf046a485b9fdda32a746e8. 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/SEAES1104160 — a six-check JSON result.
Chiquilín de Bachín (Arr. For accordion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb940f20afaee0b4167aa17fa5a9671cc278613ee30af3f70e8ccc29f10ebebe5. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAES1104170 — a six-check JSON result.
La bicicleta blanca (Arr. For accordion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbd5991795a20fdce84594bdfd23828d8d15ca0b5628ac5662b803913fb7291. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/SEAES1104190 — a six-check JSON result.
Grieg: Lyric Pieces (Excerpts) / Peer Gynt (Excerpts)
Bach / Dowland / Isaac / Machaut: Antiquities
Motet No. 23. Felix Virgo/Inviolata genitrix/ Ad te suspiramus: Motet 23: Felix Virgo/Inviolata/Ad te suspiramus (Arr. N. Imai and M. Miki)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07059efecec28d1162cceec6ee8dca13b327f43e51ed23afce0d8d067f040fa8. 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/SEAEM0429010 — a six-check JSON result.
Violin Partita No. 3 in E Major, BWV 1006: III. Gavotte en rondeau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133e3a5da9201debc8c383b92571208a20e1cdb7758afc3457032cdbfe50b2ef. 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/SEAEM0429100 — a six-check JSON result.
Book of Songs, Book 1, Can she excuse my wrongs: Can she excuse my wrongs (Arr. N. Imai and M. Miki)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d639ad48bf10f443aeb6baf1a8f8ab8a4dfa38f0ae8b41f36a8ce48ea8c9a69. 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/SEAEM0429150 — a six-check JSON result.
Nouvelles suites for Harpsichord in G Minor, RCT 6: L'Égyptienne,
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ea304519b675dc9d1d89a710954ba5f79e5a87d70f768c789915b27a0ac342. 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/QMFMF1516260 — a six-check JSON result.
Nouvelles suites for Harpsichord in G Minor, RCT 6: La Poule
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae4109cc2814aa0976f5ba7fc13b336aa6c43f190375f414ca2fbac940491e8. 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/QMFMF1516270 — a six-check JSON result.