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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ed4e45262bcdffcaf715be6b7163a99d89f5c496db30ee8d390bf41debb399. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3603f124-9480-4e5a-8566-9e772acb6164.json and https://artists.proofprofile.net/proofs/artist/3603f124-9480-4e5a-8566-9e772acb6164.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbeac4cd32ab2ca8f4812289c9460877add341a937258b67fcf9dcd8d5c5e75c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132425001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72fc54bfc622dead586efc23a0aa86847311a7f2c0009a5f10a83ff5c6bb29b9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRZ132425002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf3c956f987e3dd7abab11e31a24b6931ef662f0d59899164e440bc08642200. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/FRZ132425003.
Chanson espagnole, "Les filles de Cadix"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa6f13e72c3a3e14b5a5cc64022f6829d5619309dc947e24c13dd7efc3ba44c. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FRZ132425004.
3 Nocturnes, Op. 9: No. 2 in E-Flat Major, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e5f972b0e0d01ec07c2a09595c53e042c14a060c77e9092eb55e3d5a7672cc. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/FRZ132425005.
Fantasio, Act I Scene 5: No. 2, Ballade, "Voyez dans la nuit brune" (Fantasio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4f15ed42933610425193dcf5b1bd0f43403fadfc914c1c1b136f7c8ecc950b. 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/FRZ132425007.
6 Morceaux, VWV 3003: No. 1 in A Major, Romance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925ff3070a97bcb68232d6a60e5c427c15fee185385056d1475ad40ddc1321d9. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FRZ132425009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4c343004dcdf0d57a7b8fd7935019420b3f8746c8c81137a723c282527aabe. 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/FRZ132425011.
3 Liebesträume, S. 541: No. 3 in A-Flat Major, "O lieb so lang du lieben kannst"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3ac8750a569f2099052ed81663400b548dcb3ff00a4d3d3054adcba1a7def4. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/FRZ132425014.
Les Bohémiennes. Duo d'après les Danses Hongroises de Brahms
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e53f8717f308d7974be80e97b6c944d861633e2f3c9677ed480799673ac52d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132425016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4c343004dcdf0d57a7b8fd7935019420b3f8746c8c81137a723c282527aabe. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FRZ132425011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf3c956f987e3dd7abab11e31a24b6931ef662f0d59899164e440bc08642200. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/FRZ132425003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2ce9ee91060f11298d5185ba4bb3b0ccd41b0ef797724fa75037327dce0ca2. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/FRZ132425006.
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 0x2d54794567c3ac6167041b8fd9adb44c374ff1040d0ce21960f50598f2a5c34b. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRZ132425008.
12 Mazourkes de Frédéric Chopin: No. 8, Faible cœur !, VWV 4028
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ff3733ef4af85c7c608a5082ed07f8b3c2c82b8af5cc81cd3ac56e959dcb6e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132425012.
12 Mazourkes de Frédéric Chopin: No. 6, Séparation, VWV 4022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868e99d13c0cf8ad1fbf042f161d32a206b89e4164026e460bb953fd359fe42c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132425013.
Echo to Liebestraum S. 541: No. 3 in A-Flat Major, "O lieb so lang du lieben kannst"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd4124a08a16cf014d3df531de7814b1ebe8525174841394e30e43758823aaa. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132425015.