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 0x8a77c56cceb8621a370b224c2d8e1a9105c027c1c63809f8ce1f9abd4ec3e19c. 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/d77444b4-775f-4dc9-b8c8-01e88cf3a87e.json and https://artists.proofprofile.net/proofs/artist/d77444b4-775f-4dc9-b8c8-01e88cf3a87e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x911de1813e685cb1c390f1108a22bae67609808a47d5f453a8e0dc5694a8ffe6. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/HKI190109901 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e1aafb53a7f8205ab9b6878d88802ebfb04be837f2436716dde87735549ebe. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/HKI190109902 — a six-check JSON result.
Chamber Concerto in G Minor, RV 103: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a737f902bec878101130e7075b8f46a6d5b4a637d942938fcfb012d74282908. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/HKI190423301 — a six-check JSON result.
Chamber Concerto in G Minor, RV 103: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a3e2371e9cfa80ed5846880dbe6d6a6d53c4739cf2085f02ac3366d641dceb. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/HKI190423302 — a six-check JSON result.
Chamber Concerto in G Minor, RV 103: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088ccfb642db57ea80ef4e099fb4ffbbe4df6e3be13ffa3fa33823f368e16f04. 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/HKI190423303 — a six-check JSON result.
Chamber Concerto in D Major, RV 92: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943e9dfaf2d89754ab9cf6418c5cb1d2c37e5ba2005a79b38958c3effbd0c0f9. 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/HKI190423304 — a six-check JSON result.
Chamber Concerto in D Major, RV 92: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25ce729d00159d76a06347c55eef4836942d09eb7980f7af46468fc41067ebb. 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/HKI190423305 — a six-check JSON result.
Chamber Concerto in D Major, RV 92: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff0d00f32e6b6804c0bf4e5ae7d5dd9c17dc488aeb1f9daf4b9579fd287bfe1. 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/HKI190423306 — a six-check JSON result.
Chamber Concerto in G Minor, RV 105: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf061516f59b67745950d57c580102b37a26b8bb542cc1d35218e37a9519474de. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/HKI190423307 — a six-check JSON result.
Chamber Concerto in G Minor, RV 105: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a48ae038e18f3a3528076ab1e445a53acfd3a18707ac1de529df19784fed0eb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKI190423308 — a six-check JSON result.
Chamber Concerto in G Minor, RV 105: III. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87dfb83f040807465c9c939f7c39c1c1ca99e9ec4796171549bd5359cb7f2ec3. 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/HKI190423309 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931fe42a01007054f6535a9a54d1b8b80aad45e656b2f03b9b769169a8bae109. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190423310 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0549f8c92b32ae383596abab3495dcc49f7b4f55748ee496883b43131e4117d7. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190423311 — a six-check JSON result.