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 0x99ad7838b46d1907f04f93b549b1ad447232690832ab9202e6a2e7fed2d4054d. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4186c94-9141-43be-aff1-58eab41c9e11.json and https://artists.proofprofile.net/proofs/artist/a4186c94-9141-43be-aff1-58eab41c9e11.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 0x4162fc0d40c5c9d0988cc0eeb3e0b1d88e26f93d5bb6c1f657fa3380802fea23. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZMHM2249669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccad7f36b2da6a2fd04104a186052c715af47c06d94221059ef71ee98723d64. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZRP52452813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171e422e148b124314f927db1c87a94b865b8820952e263857f58b6bd91a6fe4. 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/QZZ7M2410759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b1c1c414b0d587ec294f32f162f1627a8fd499e573250545b513d7100066af. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7T2460779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a54324d57fc52a58dc2ee8f9f00ba049644b42ec38e96f1daf87d9a93c26cd. 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/QZZ7T2460780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9679e79ecd74d6042eb70ca3e33fa08f991a5a07cdf39d50a6b6d2103f2c6e12. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZZ7T2460781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45591235df746663903469a7d0922f45b75898b03541863b8cc6aa4660bebbb3. 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/QZZ7T2460782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccad7f36b2da6a2fd04104a186052c715af47c06d94221059ef71ee98723d64. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZRP52452813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2324e0fb4e7c5a42b9b48e6c91a9dc5d35c918197eb3a6d1f2890f8479e3cf. 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/QZZ7T2460784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371b7fe3396e8ccfb9d124067b8a58c0c6dc9f52345082f71d4bcd0d6a16bc05. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7T2460785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d36979488e9c50ccb22e2bcba3986478e23087c6cf62f3d4b0225b55c3e1fe. 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/QZDA52591871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc6761669cf15cfe8d924a06d1ff9447a75e950697595fcc751bab9f369fd88. 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/QZHN32544126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff12517249a02f7eab46dae996aad105733855bd22b66c9648ff696c99393895. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6Q2578089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90f8094f35743308747878a80cc57fd0365d5e5b8209bba274c0c67e7354257. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZZ7Q2587795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5ad650c314e0374c820179834a6407d53bc9c814dc30a3864139b29f064456. 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/QZNWY2304745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d4ad6b7cecf708835b4df2097137198e41eec7812b2a216c6f84699b12ca67. 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/QZNWY2304751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424a8532b839794879b90fe7da836626f22a0b6b3813f5547767052f979d0aec. 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/QZMEP2213948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab5e0461e8ea4c6013f13793b4112127c458c2ebab14c481f3075e5a9261c7c. 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/QZS652174013.