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 0xbf334a99c2ec2a7cb5f3261d6f2dbe6111309480adca3db4f67abd124024812f. 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/a92e119a-586d-4b27-a389-91805def0e43.json and https://artists.proofprofile.net/proofs/artist/a92e119a-586d-4b27-a389-91805def0e43.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 0xe82bc1a3fa57adabf4d3b1802ee142c2e8fe49853bb917058c247fd5a83f8430. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBHLW1801549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e19f1954dd483d9eea52de43122d446c906f1aa15dafe862ce5ec8e1bbe142. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBHLW1900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08769f8517fe700f2f9e8200299b7ba556d8b21b157d83e3466475d49261702. 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/GBHLW1902688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228d256bb03e828ab8248027c49ae2e05efa20b5be87f3031f7c04709e4c471d. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKZ4L2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43db0642fafbd3644bfcc3d9205b3746083144dc12b6269dfe64bc6968b1fab. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYZ2214064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed298e89b2d6bced121db95e4da3c10fc54f8a4b730823e9b40917519b6c129d. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:43:41Z), 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/QZFYZ2279168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa495ed402796ab777836aac6449643ea69dc55fc9b8db7d3108ba869124f65. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA52257606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20a733b59ca19a604637d8297fa12a86339995da63d1d283e826558169546d93. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA52257611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7050af1a24e3c60c0beed1a01858ad799afa49be2a01e9cd606f0f5df13915e7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA52257615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42cb2d7f0caa6eec73363a04ac1d24edd3729a092ad3741d6b6bd3f80c5b9a0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMFMF2422357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f91ff99d35a72a3d3b7e4a2025eae271112cd545f23bdee4b9a796e6ff9234d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QMFMF2422358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2379a5b278f44429b60ba6aa4dceaf4cbd14f6a1e7459ee33b4529ba09c08a3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USA2B2512025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310be23c90affa17a56bd63efa29b6f4c7c1657fade297cef2822bff08326926. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:56:48Z), 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/USA2B2512026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310be23c90affa17a56bd63efa29b6f4c7c1657fade297cef2822bff08326926. Chain 2 (Bitcoin): anchored in block 958863 (2026-07-20T10:27:46Z), 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/USA2B2512026.