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 0x954222fd4623d03bb021ce602d314f609924c70967666d11674e84ee04f5adf3. 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/555ee2ce-0f67-4dfc-bb63-98bd6e52fe77.json and https://artists.proofprofile.net/proofs/artist/555ee2ce-0f67-4dfc-bb63-98bd6e52fe77.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 0x8ae221471bb0d1902866b4df0191bd6b28543b821e523ef052b4d58897023572. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAEC1939141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb146db712521b9984ad6a759f83c0aaa0f6d070b7278b9187fa95f9cdbe11c84. 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/TCAEE1948097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619371cd2044f3d4498a974b8e4c1c8b199a5771e35c45027462d470d683730c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEP1903978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8764ab7ccbadace7922a73d89f8bdfe98d00e8ce13906a488e2038b80d411a1f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/UKJ8H2006095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ef5d92a2e3979f614926fd361b02a1e4506206222e0930413246dd657bffe9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ22191060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ebcd85fa40b16b39d251368683cf577b828cb8036bbb380f092a6850bd8d08. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZFZ22191062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83108b6b204fb55a1b053b6c8ae5676836a1bec78a3fd38c6e82681bccadbd86. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZFZ22191065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e31331bed90dba5017b9a0886c71710d1f6df921636b3aeb80f749c2ea56955. 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/QZFZ22191066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0416c29089a32e9861c4f12cc7a97efed948a1fbd231364eb1eff255dbe86c60. 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/QZDA52227225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50725073675a57c0c2708ecbe44e37cc288531a8a34898e5114d1316bab918b. 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/QZDA72234249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2c7425af3fca214cc50a6fa034bec35b8542ca3e077c7dbab5674e9d2b5295. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZDA52358138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19f883685d96a4b8cf9aea51a7a54b4f3756df2d11d626c4e3c4b04994a3d49. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZWFF2419570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9b868d65b14a469e3c8c98bbfa8b7e9a6f75b8815731eaff7f669ec1db2709. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZMEQ2570913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57209a5dd471ee775ce2552bdbf126c91034d407f8662c99f9c806cba27da1b. 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/QZPLR2552642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908f753c8b03b055457fa4bdb6770d1a8e8f68535a4592c1f5eb66b373e4ddd9. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZZ7S2537444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2201bb659c0ecab9dfbac5ef098c8187021d48bf8a131458d911d6235d2233f8. 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/INM432300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a3de44443c8fd05f26a8ca70a7977fffccdc4583f2738c65ffc12bf93e727b. 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/QM7282476851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a3de44443c8fd05f26a8ca70a7977fffccdc4583f2738c65ffc12bf93e727b. 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/QM7282476851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a85df2c42b87cba31c30e50acc608a358a8ceca0ccc1a299676e233edc28ab. 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/INC622301195.