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 0x5402bf70e24a48c10ecabf514966aef35b691bb04d49982af4388e7950adf8c1. 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/6fca1852-83f9-481d-ac89-ddb9b5ba3d5f.json and https://artists.proofprofile.net/proofs/artist/6fca1852-83f9-481d-ac89-ddb9b5ba3d5f.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 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 0xc5432ed3987fa2c3a2c83b9241dcceca22566b3053565e6e77cc87b2a6560a64. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZS7J2597753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625b68bfb61dd676f4abb66aa7c9bad0a0d67b921dc66ba13b399d8d450dfa54. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZS7J2552291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062af57a355916db4ba82e2b3910646400805d13574462386255ce5b13a93913. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZS7J2551291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689b91761c71f471bc95ac3ddfa9f65bec0e4b63d77a8f32049ef5d66f9b9e5b. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZS7J2559625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3e837252129687b39592fbffdd6f19940fca75a7ecdd8145cd63b1060f982e. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZS7J2544088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7453f037a4cd00343b5a128864ffe374131ceeda747d7e7b056b7de4634a8e37. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZS7J2529659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fc469f31beec43a758258aa821fec7bfb1f4f654053f85bfdbe494e78882e1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZS7J2525226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d26004b252dcfa5e2f42e44da72813c0fac009b402f728f5c68bf2ce5d7f3c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZS7J2518531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9011c06bcd78065d9182cc0e78df05c9d0b7d1e25063b327aa97249951e1ea44. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZS7J2508124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2f137917e505f7ccf44244c1e88531f549a0dfd6e16521759fe90f0ee2eb84. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZS7J2569853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1a7ea5970cd2135a033dc4850562cafb27a2100f43a69ee27f5762d0b331bb. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2583095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65a31038fcce2e92c8ff6fa22446397c05a96fd608cbce434a83defbfcffe6e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZS7J2523219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53857d50c33a364ab480a563f287465e5b21278a9b3bca35df976beb4961645a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2515149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b82e5bbc13ad547eb0bdab46d41c9c4613c8ab049ac7b575fbfcfad20e86f4. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZS7J2584303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9423f1cf265a772d29fcbea55f87cd98f91a5d9c65be2fdbccce04e88f1be3e6. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS7J2545624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e492168334923484f2d172542bbe69ab68abfe8b3373b1d42bfd38c0aa4f98. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZS7J2554921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20886879e7c1f2c0944c9701e34767459b194d329e4cb6b2091cb84a86a9db56. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZS7J2513117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf613286b615ee50339dd30784ef10fb65f70f13bfa99ab0e7901653b3085bffc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZS7J2505681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91eb293c6a7e96a0994386a002d9d61d6add423d064b99047b2b9580946efc8. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZS7J2531414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e0eacf9f53459461bf467b87d2ac65cb74f2f31506ba85201d6a87bdedbc64. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZS7J2530826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119d70ed20d6bfe5a16747f986982a429927347a0efe9432c988d37cea55edab. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZS7J2537040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e328afdecef625b674d9b7fd2f024a183c67b73b2944d88bcf2268a0525aef. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZS7J2587635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea99088327ac18b9823583d2f46a7b9cbd2d47ae3ed0ad99e474097928e8d1ae. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZS7J2595621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cbaa2e2bb316635677f723e9a9e6b5c7e94f4f0190070fb9c4df427899a336. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZS7J2598829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a798217206e814d1b2e35ffa7fc17e619d61049310c985bc3469198bb9942d. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZS7J2515852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ba4bcf4aa8b5c20f335bef308affeaa4b0e9a1bf9b4d1f89b99c65ed5f27eb. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZS7J2511946.