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 0x7d139e1aba48ef9daf61670b3226ba9f818c57614a667c0932c23537ec12d631. 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/42a34581-ff70-43a2-918d-ff9afba11e83.json and https://artists.proofprofile.net/proofs/artist/42a34581-ff70-43a2-918d-ff9afba11e83.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 0x750db6f51b0074be78ca12f3b5cc855a83437c54d5c8e4dba358bc62ff80a002. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ32544949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53e6ebbcffbb855b7992d2f275efbea5a72349dcbfdc1a0c257d69986a303f2. 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/QZFZ32544950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954a652d2562deda74696724426a21a5ef87f714c29c24b916843171a2900cf6. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZFZ32544951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfaca4facc261f75a61b95f7d58b3921f3e8930513feef6e4b06ed481bbec63. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ32544955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd047935fc873dc52a00b74b5db3617b172f54746687ef7f188768b96f36515. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZFZ32544957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b4216f76b89d7b998bd0b03a9360f6585416bae1a1262911429954113eeba5. 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/QZCE61808231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1cc5b4c7e4e8fa2563df4a4853fc6b8554b1109d592f6f670428423b0f3853. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZES51907626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576be4798cca8ef3dbb225af20cd08bba3cac511495c3f425e43a5b2989884d7. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZES51907628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc529fe37e8eff315bc7801c6f71d355f2cfc5bfd1d2675c556dae31ec287309. 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/QZES51907629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b415e5e8319fbc85c5816d13aba47e3d5632b712f3d464b978903dd19200d4d. 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/QZES51907630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7722578ff27ff2220941e3319bca9bb35b0b0896e29c7a2160b7cdcee30a9e05. 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/QZES51907637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6baab93c367ad75edc0b36026a3be5203ba2b3f79035fa8f68332398b972d870. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZES51907640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf910487a21e006823c62ecb9f02fdf7cf5394a09278cc48fe348f35153cdf58f. 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/QZTAS2358752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946286e72023e707da1050131e22df00c1fcf1fa99372a22a4a788b4342e347c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZWFG2344167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c83897a595b2901d31e4de53a865df016973e1213b4875f0c697b45fc607b8. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFQ2393413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb22cbc79aac80604fff270fdeb5d987134502887740a6dd0df450b012b4b9d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZMEP2438825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218f1703ede1789de256e71045006ee9293a2089f6fe0d2d45b57f56fe837b1f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFR2478450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c43eedcd576f1b5adf1b07a90619510a788eab76491f616992d9dcec8030d2. 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/QZMER2539987.