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 0xc968d484b1fe766ed0d0d2724d507fd52ee075d976092ef3a801effdd58dd610. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3fb0bfd4-f26f-45e8-8858-49f4474d5a2a.json and https://artists.proofprofile.net/proofs/artist/3fb0bfd4-f26f-45e8-8858-49f4474d5a2a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Duet for Cello and Double Bass in D Major: II. Andante molto
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 0xe5d9983590ffa8f260df6e8b8143bd92a18bdf36666358aae0cac6ca1b58cff7. 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/DES380011365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4df31a18018a91477c99a23c02b648dae4bb1333421359b8b59a2f451d0e14c. 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/DES380011366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453e1958377c14bc413f8cbf0980530a6045de99ec4710f1e3cde21e13ca56ee. 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/DES380011371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0efdfe1b5c0790c1295c7a8c155c4e26372b947d4d607a875c5439f38fe2f8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DES380011373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0529d8dd895d6b26d58eb65b41af8c68ade0e67155852d589fc3e27db81fc47a. 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/DES380011375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a2026a7fb72bff0250a16b4b86f707f1b60ffab25fcec895ed79a7967f0853. 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/DES380011377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34597e9f787b8f7d4bbcc0b357dd4bd50106eef60ee45d8802bdd7ea802cf9f7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380011364.
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
Divertimento in E-Flat Major: I. Adagio con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2df90d3dfc6aab77e4e1fcdcec61b193ee481d84f479e36ff4f1e3584e1e1e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DES380011367.
Divertimento in E-Flat Major: II. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1790fc6bb710170dccc212e01f15b2fc9fdf7d40b138949315324b8b3c0ad12a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DES380011368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e56f8bbed02bed67324eaf10d0c4a56ef7e0218ab7f097a75569916f8deb45. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DES380011370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc3e35c80ae94e02aca7a5ab5f1fff856ac942b345fd07f3962f85a3e8bda36. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DES380011372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db8283411b965a0daabc126a9aef60b895ef65cc576d3d6318bac61c6cd3bad. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DES380011374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf64f21b41174732244f8d87ac77856edcc600ca7d519585bd116cd724a14448. 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/DES380011376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc75ad847fc2b08fb356a30194a2922000dc3b1bf54e6f5e94e9ec777226080. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380011378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbf7838738172864deebd7301d462c9370e7c2aee88af8cefb37b4cfed2dcf2. 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/DES380011379.