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 0x490bd407a0ea42bab0db2ae0eb81cc7a873ad66569f5db67a08e91ecddf8f904. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7841652-d55f-4668-b687-8c7a324ee967.json and https://artists.proofprofile.net/proofs/artist/a7841652-d55f-4668-b687-8c7a324ee967.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 0x28904d1b576c93375a5e89bbc3648835af7ba3a5ef911989b8716c5a4acb85ed. 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/QZRP52433691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77f7757b659729997ce46cc00bd681fc2cf057b50dea3a1dca08727d0b2787c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN92409651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e2aa29155873b547bde0cf7905134b294dbeffa19e2f85823f1e65b5ccb1e4. 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/QZTAX2331716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc201e7548fe5084bb933569dda1aa3cb5315881e3e6ea5be007164df95b50ff9. 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/QZTAX2331717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aad99f40e59d0e46be988cce7c576ae3fe4b419b6e91d62049d57ddd7bd2103. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZTAX2331718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26168386499370322e19746aac6d776f256ebb962d6e17f12ac89f109d2851ab. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZTAX2331719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26e2aa29155873b547bde0cf7905134b294dbeffa19e2f85823f1e65b5ccb1e4. 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/QZTAX2331716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6e43d3c0b5fdbdde3825c3dd8ee19ea1c96c840b5c9680d37bded11d47df7d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZRP52399304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8d8f69906889ae02ceafd645f49c7a539ec0c8b2db93a5367e727dd0848a90. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZRP52399306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100b9d6555f9989e6ed5e28b49dbc89c0980174ec2d960e32f7d0248eeaa42e8. 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/QZRP52399307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae11c90ba8145e0049651b4ab047bd843a940f80be911bd89d2790154bd7ceb. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZRP52399308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7922fd271c71445ebf172f455003f62aaede5a4893917e04932b2a2c38867558. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZHNA2359012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b122a04d0aa53cacac0863e45eb80f083e8b12e1654a36cd99b413b0a1b9d5. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHNA2389196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0063cba374a86faf3a1a53d03cb7c18b62ed80b7f15b1c47ab5d328e310b8fc. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZES72280298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234844c966b24ed5a99af477eab0f16e24a95a49ea32bf771be27c0b48683b14. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN32208984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10f348098cce47b023e4e007b869cf22d34cca346568f000203621a2b3401f0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZHN32208985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b28f5e47bf0ee893be7bf3f65bce58273e2b25e3df2e6a367efa354f8014a7. 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/QZHN32208986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd619961aa5eefba55dacbf5be64ebb547af28738d18ffa2d5bf86a774c5e1718. 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/QZHN32208987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e73592ff479d96b58d6e7c4bbd35eb97bf444e237d8effe9ed34099a1cf907. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZHN32208988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0063cba374a86faf3a1a53d03cb7c18b62ed80b7f15b1c47ab5d328e310b8fc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZES72280298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a205d04a9e05f37a967cf1500f4830e2f953d3449933d4637b4f08deb8444e2. 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/QZMEM2161469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5a050720c956a08788b1ac850f9d501137c9172058901e7cc6186be6752e22. 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/QZMEM2161470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2756265160698b94a5a61e20dac779ebcfca33c902f2f8aebf298aeb7adb38. 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/QZMEM2161471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047bd809330170fe5bcac3e244b0d1c2720932062eebd4778cf81dace3f25b30. 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/QZMEM2161472.