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 0xd8a4de43d228d92e980d1308afc9c6315e4a17c77e62fed39c5147ec2686635c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/afd30fbe-936e-4e59-afcd-54362caf9d53.json and https://artists.proofprofile.net/proofs/artist/afd30fbe-936e-4e59-afcd-54362caf9d53.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concertino pour Harpe e Piano: I. Allegretto
Tailleferre: Musique pour Piano, Harpe, Chant
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 0x11ecc006dc11622162c1e2adfcad606c03f1add422a18834fbc0b8ddba2d8a94. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ITK602121212.
Concertino pour Harpe e Piano: II. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21fadf64f285e6b3b7baad42872dc8d617d0ca8fdf46c1048b597c95a2a2b91. 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/ITK602121213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc78acf2dc354351fb0efa6ffa441e5f11b75f608612adef8e6531465ed4bb36. 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/ITK602121215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f53a61432ceec0492a99752a18e85dad2f1a1644c04daf05f3d4a97780d8aec. 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/ITK602121216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6760645d9e29ccac595dcc8f2eedbca3c140dd3ac7367cc9a6b2b79f19d9ca. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK602121220.
Six Chansons Françaises: 1. Non, la fidélité…
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fcbf4f351acc96258516b1e74a4ad901e1a3270687ee6d057675297380f219. 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/ITK602121221.
Six Chansons Françaises: 2. Souvent un air de vérité
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86393efa96a090ec4f942f78e7834779b497ce04841f7fea2118da10e7ee5494. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK602121222.
Six Chansons Françaises: 3. Mon Mari m'a diffamée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb51ff5cc5ed81ad0ebce1245b4b8d3e813bbe9cce97e25097f3a2a67a8e09ae. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK602121223.
Six Chansons Françaises: 5. On a dit mal de mon ami
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b36baa81c0f9ea21b281ab4ffe588452d86618db27934820b3bf8477d916e7. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK602121225.
Six Chansons Françaises: 6. Les trois présents
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fdb2a83a4aa8524dcface402c5c09a1fa8b1884136f655d6de2e3dad362732. 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/ITK602121226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1b0e65c4e6df93a69d92197892b725cce3937f07dd651b164ac56577772f313. 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/ITK602121227.