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 0xa8457174bc60b14ce590bd8ce0071ce35df5718bee8e52ca0580e8619049b79a. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb653ede-efb3-438d-ab87-c64fb991786f.json and https://artists.proofprofile.net/proofs/artist/eb653ede-efb3-438d-ab87-c64fb991786f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Nonette Pour Cordes Et Vents en Mi Bémol Majeur: I. Adagio, Allegro
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 0xeaa679b2366c91d4553458c82b85363b564e7f2b8f39ad0480b21a03834869d6. 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/FRZ130500091 — a six-check JSON result.
Nonette Pour Cordes Et Vents en Mi Bémol Majeur: II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0db8f51d548f4cc34ed63e9da1efe646c57ed748e7aeeb116523d69986950c. 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/FRZ130500092 — a six-check JSON result.
Nonette Pour Cordes Et Vents en Mi Bémol Majeur: III. Scherzo, Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f504ad2d41527c1852f75bdb723489516a336ae81a5266d194db035dde9519a. 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/FRZ130500093 — a six-check JSON result.
Nonette Pour Cordes Et Vents en Mi Bémol Majeur: IV. Adagio, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5cc255b44b18c1bb9e3fe91e3f130082237222e095165f151c88b472971563. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRZ130500094 — a six-check JSON result.
Histoire du Soldat, Pt. 1: Marche du soldat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25347601ca14ce5e984e383fe8333883043809dd7b470ac811aaff0a926c7f37. 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/FRZ139610500 — a six-check JSON result.
Histoire du Soldat, Pt. 1: "Voilà un joli endroit..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff030fbb83db491e7b74715dcd0cd13daa631995dd5e3138bfb1ad6e2b661a8. 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/FRZ139610510 — a six-check JSON result.
Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7df34b239c25a3231d85f2fa29360c723bb99c1aa91e935a9945bde296753b5. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ139610520 — a six-check JSON result.
Histoire du Soldat, Pt. 1: "Donnez-moi votre violon..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfffad84564bb0c7ded2376c735071d1a6cec3502bfffef9ea14f47744ba251. 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/FRZ139610530 — a six-check JSON result.
Histoire du Soldat, Pt. 1: Marche du soldat (reprise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8cbdacf3af4880f365f2df863d50f40f2d33b1bd353a3119fa417eb523c900e. 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/FRZ139610540 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2812715cb5d84f3ceeaeffc848697e1fae381ac87dfbc2f6c34de8bdc4f43b4b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ139610560 — a six-check JSON result.
Histoire du Soldat, Pt. 1: Petits airs au bord du ruisseau (suite)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da1cc8e58e3c500f3c3d940ef534d21bda771d91b1c9813c1552d4ed9169151. 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/FRZ139610600 — a six-check JSON result.
Histoire du Soldat, Pt. 2: Marche du soldat (reprise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965da4f7319b22f138d631d28ca8279647c07dfb42436161bbeb68440611019a. 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/FRZ139610610 — a six-check JSON result.