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 0xa9b5f066b936f896d119238eee4a497673ba73f01021ed7cf7aaa5ff0cae6ffb. 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/f8c920d1-bd2a-41c7-8ccc-97c680b9b50a.json and https://artists.proofprofile.net/proofs/artist/f8c920d1-bd2a-41c7-8ccc-97c680b9b50a.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 0xc23ec38c884077eace38839a23a0eb9525ee53bd5d89bfab6f2915c76c101551. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QT3EY2489177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f07abd2babfe07a85ec12012dfd113fb95d951b3bbedbe29d4b8d98ec5eafd. 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/QZFYX2429383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b370ee591c52103a02e749492d9d18ed5cff08b8867397c85af398ddc1289a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYZ2442598.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfd2affc4173b287c98451c1e3460701b43ea9994a4b5f71761524e6ca70458. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ7T2415328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0f49d543f2b94e098423a6efd625c16386ddaa7fefbc810fffe27e100e1837. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZZ7T2415329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bc8f94189631c58c77b5a3506026c2d8a2378d1773c09ddbe63051ccc8e448. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZZ7V2488710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be83f1d6c1b0752af23ddea17645a0cc2050c13b4f8a44d17ea49d72db0fd1e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT3EY2489156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96028c8bc7227b09587a9beb24f246cf5e6aab71d3586e9558a31f1648c73cf0. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZZ7S2488333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fab4b337d9a2c56a4545fa055d47467ace21ca39cf91ffa70456dfcd800235. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZZ7T2456615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80f3409e94cb420a54deb6a2d595e71afd17bfd4934c6bd4dee97356289e904. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZZ7Q2485668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3a69d392e086401c38b603d2aeec9b1bcff96a8c746db11d717daa7db9bd45. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZZ7R2471889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389f33839c57af3693b2b7ee9ee72b6d56246cfcbf24620c4a12f78bafe465f3. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZZ7Q2487676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123d18184519b55511080719071cbf590db0809c90e6912b497ceff7cfb5ca28. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZZ7Q2487677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3dbcd60a803431b4696fd694358f5f93770e96c7a2a04efb6916b10fdafb22. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42535127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf707cddd27a1835c33bc9de6ece8c3390812eaec802ce6dcf41d3ca82e4ae614. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZZ7R2416172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a6bda6f2ac01168b37c045855cc852d19358cbedf81bdd43004b6b7e7d1186. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZHN42501611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab804715045b1a019d0b2e17bf4d5b3078fd4ee888ff7bb9a0d3d2d653eed1b. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZPLR2505146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd98e1283a99148dac25098402872a549dde281106451a4c9cf01196143c19c. 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/QZPLR2507137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bcb42ef47c97a9987708b9955aa30e20cd0d7dd64acae51f1bf4b875c0d7b9. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZTB52518528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a4497e852356041011d1f6b80372bb9057aaaff38ae23a8149110d74aeb93d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTB52518530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b394db88e52b6581e6e92b02572ab584544b1fa50700206aa15848c4ae67bfd. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QZTB52518531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc124c9915f9a47d835ae5925fc871256631cf68e5f97bb7508f269248f372c6f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB52518532.
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