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 0xae9d783a2b3d3bf14408849288cf9bed40b7756d4f89141ecab7781fc6d8c47e. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e89f9a8-32fa-49e9-ba72-aeb8ad2c45fe.json and https://artists.proofprofile.net/proofs/artist/0e89f9a8-32fa-49e9-ba72-aeb8ad2c45fe.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 0x8fd062a168956b1948fc058363be876f11dfda70b6cad33e2785a1d302c94a71. 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/QZHNC2215934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d02dde5bf75ccb3d0026c1017c169ac86cd7dc3272e60538c527d308a961dd8. 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/QZNWQ2263230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece2bf2339a64f7111f5b33a5146c2b3876b5f001ee6cadd2df1f6110e81ee2f. 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/QZTAX2299569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ba01cfcf0447b29cd63d25f8fe98f1d85070500e54dfa4398ca0e222f39a55. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZRP52247188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e27cb40f5259b2d96fd3f33d913ef98bf8c26c3690185a3353ee165b42843d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZK6F2202202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117e57cfbd679755ed01607ca6543e24b8f97753a457db6f9ff45c7d1173d9d9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYX2338093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1123b28f2d81b0c3e249caccaafd4d65abc5c408a12a14eac3d83be4e04a3b91. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES82354599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b98beb0a1134cc631384237ca381d12bf2a1f8b31617c593c325ca41820fa95. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES82354600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa959757da74770603f1eac3bf30aad581e1f72de60755ab104bc0507aae1d04a. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZTB22342622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e214f8089ad0c6a04745436cde7f3a5447d81b1ff36686ef80bcd2858d50c53. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNWR2385976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346d9a68f5875eca67420ec30320dc45adae42ffb1fe23c02f331a7fbc0d48b7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6G2378378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece2bf2339a64f7111f5b33a5146c2b3876b5f001ee6cadd2df1f6110e81ee2f. 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/QZTAX2299569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d02dde5bf75ccb3d0026c1017c169ac86cd7dc3272e60538c527d308a961dd8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWQ2263230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff2bfa685226073cb5a1b10962d3b955a68d1fe9657fbb9d1bf143db0eec558. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZFYY2170796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9e1c5d2f01fcfb11a93676b946f7940bf26e5cfaf981000fdf787f3c74660c. 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/QZMEP2097162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d911be5f9a756b0a12bc5080d91896ddebfd45ccce859ee6517488f829461db. 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/QZK6H2017946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82437b2a217dd164cfca5aff3659e6d29463dbb7ae1277c440439901ac3a862a. 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/QZWFE2566688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f01adebb5cf1e2b8c9ade19957f4d4083bd830d8a75631c45deb13dd144268d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZNWR2508375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f4706c76df4b962eb5ba49a7c94b27859088ecc5fe8b7be741e471e94ad1b1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNWR2508377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5195b471b6f6ccb4f398b25dab4951542f79499c5356c60769fcb3ae92cc7aa7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6L2548457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc298cdcab8685fe97e8f35c06f2b483080dfbbe0887cf428c5766c734bfc2e56. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZHN72513649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ed8a813c4af2cf39ae8236557b24df4bc7e5f25cfb580fd9a7cabd0dae98ec. 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/TCAJH2548341.