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 0x9427331d0c3353d8a4b23ce83eaec867157defa1279f554b6632e90fd639d675. 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/f0f7c1b6-72c9-47cd-84c3-8e9f167c366d.json and https://artists.proofprofile.net/proofs/artist/f0f7c1b6-72c9-47cd-84c3-8e9f167c366d.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 0xe94977f96e85a499f0dcfcb6d85dcfacf04bff0fcdd80b6398eecd27f01a2134. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZNWX2585937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7c936d2ca9779b342f073db3f90d8fc045a6d988b7665c1087deb30578847c. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZNWX2585938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66947d4565238b1e45f2daea7df71923c84d57d1d44d50592cf064c1f8cf56b4. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZNWX2585939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4402c88174a98d25635bfb2f6d8fdb930750e5a79408b457692ed0737cd32a0f. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZNWX2585941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee66314b405b5c5ca3f3b3bb47a238953a5e69244dba0e208bb2faae22e4713d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNWX2585943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c794925b1b6f2adabf70b487501611c39312b191937732a25ba3dd9b687e54. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZNWX2585945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eed994605f752c4f6dea810cf8e4168a2cb63c054ce0b5fb8c82003a7e7c3f1. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZNWX2585947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06aa1c4e73cc5bf5b5c0a0e8766074dfdccb1601b0ae6b29fbb75382917246b9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWX2585948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb0be4a94d3b9280dbba202f78b0ec9c466a964a842823ff5986a6e6e2a0f41. 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/QZWFS2592896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ed5d6294c4ecef02e3c3bd3e6dcba49cf7eeb3c32788fdaf31cd4790f0a8b7. 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/QZWFS2592897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a89c9794586dafa94db35c88c6165b8f27ac41965c5ae53f7541f85105cc15. 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/QZWFS2592898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb061ffa8408ef7779a10de8754d545e5bbfffa887aab230017334d84ba8fe9d. 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/QZWFS2592899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9280dd80a2599c84a01bf986300f79010770f97d1462e916b30c9c85c2d3ba. 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/QZWFS2592900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf304da11352ef4b34055bdd82c41aad1e0e4c1490076e539efff3e16ba7f5e2f. 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/QZWFS2592901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d297776360b5b0a7d4a3aa359a58a8a0d81989b6f42995bc13b2a1d3a6cb4fa. 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/QZWFS2592902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c58b976525ba694055ef8d107c9c688243623e06e448563f6fa6fd22bc2abb. 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/QZWFS2592903.