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 0xd436f7353a1c781b4a57288cff86338d2178a31850f34343353d46ac81b94c48. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe09b61e-d7d0-4097-b0ef-2b752fbbd068.json and https://artists.proofprofile.net/proofs/artist/fe09b61e-d7d0-4097-b0ef-2b752fbbd068.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 0x519174a615d9effdb7e659cc0bba528c3df04d1105452621b3a4005d11a9d830. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZNWT2525701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07147b0a77026966883c0b7530bf04e3bea4beb416a261255c21635c80cbbf5. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZNWT2525702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6370cb8918f19be88cfdf2f1fd1b7e8eef6d457cf7bb2eb2695b41a8b8e9c578. 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/QZNWT2525703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c29d0049483a95859cd4bfa6979515492de8765c8b40aff4432466b762902c. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZNWT2525704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11aa1b31846b7a33c4e09a3de1f1eb7bfdea481710efac0213e71e5348358aab. 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/QZNWT2525705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cbfaedbf6b0696df31e15820dd4d55b41e20c18de0993e9d4a74341649c87b. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWT2525706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb1d929fa38e960d9d482741295442eae435c2432aae98fa33fac751fe148f0. 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/QZNWT2525707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ece343d8d460ebed700c7c556d273ccfc2819c4ef68af8dd0fd240575a2c289. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZNWT2525708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece83424a9992d17dc3af9537559b93a5fa8aed3a2d0a80099351bce7061010a. 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/QZNWT2525709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaff561660f59a03f329e47418901feb42596096da2e0231feedb6427504e7e. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/QZNWT2525710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b21689967cd430803a4c1d2676f20984ab25cc1bb5eec793a3629365a6f91a. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZNWT2525711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee590f44bd0c03212ec042cbebefb509cb06b227045988307f08fb957ba0ad20. 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/QZNWT2525712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccdc42cba9d3708711deabd94b9f4a5c430e032ac30071aca9b4b66ed427c84. 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/QZNWT2525713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdf16dc3f95dbc1785b61800ca9c6aabf06e0d077e61cc619e48e8392912c8a. 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/QZNWT2525714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b6fb1bdd534c937095e504c169973a8496c744071db03fe5113e194e7ead49. 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/QZNWT2525715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98cc4eb0ad87ff60fd4246fd551a2251019e1c20367f53362fbf90cd048f470. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZNWT2525716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e86192a2fca83363d14badd575c1f8d14b8512273492aa97b932f92419aaadd. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZNWT2525717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbfe2ae63eb3f02a6a8004496cca61bf7f5c6fce0e7f4596433543b72272bc2. 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/QZNWT2525718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b78642d1ad22ec240b074f29c5335e18b0749c08c3c5d3af443d559bb8f781. 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/QZNWT2525719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c862931db30ba39d75688a20b9d324212370a4706ec5cd1ae2f488a7e9462bb. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZNWT2525720.