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 0x69f1f9d92d921364d593870b7acfbd5c6aa324dbc2ea38a8003132df365a5294. Chain 2 (Bitcoin): anchored in block 953954 (2026-06-16T14:18:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25cc041b-3f9f-475e-a7d4-74416567637b.json and https://artists.proofprofile.net/proofs/artist/25cc041b-3f9f-475e-a7d4-74416567637b.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 0x37284a48ce884504ea33c4d7cef0eae9ef3042eaf201afbe615ea916d96e0ac5. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLG662000531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d685ed121902d4b62188307c533924815dd92df894aca4c5e8fd6b620f1ffd7. 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/NLA6M1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d1e72925092ffb2115d2dd0ae21a95d72e41431e5386193e29e56e5af2ea46. 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/NLA6M1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402633e699a1673e8d335d4f8cbb58bd0a1acc5b7bd61e1c1ef298bdd0d9f232. 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/NLA6M1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d685ed121902d4b62188307c533924815dd92df894aca4c5e8fd6b620f1ffd7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NLA6M1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52ee0bcdcd94bd29f007cdef6e4155a547c7e27cb9d8a1cc1400fc2f099b43d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NLA6M1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6387b4ea73dca35042a0b45e7599f8bf6363601972fb63468df451fdc989d2ab. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA6M1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4c37514d1ce192f02c1a9afb422d851448238c051d96f6cd80209a81e95b55. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLA6M1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3017efd8d06c05b2cc82c8b3051fe4063d7ebd1a29248855fc4e220f7caf89. 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/NLA6M1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5af6aaf52809debec4a25d52bf816960d0e44b3b7d5289d435d2bbdbd9c8a3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLA6M1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e105afb16e685beaf75d1b517701073ac85d6bc3ea7aaaa9707e163d3add3f. 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/NLA6M1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bad6cfa84bdb675a47a3623cdb508b2930013cf8ef521e9df77a40de0706451. 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/NLA6M1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee84f389cc7228e2d7e5a5ed32083c08a60d54f7a0159975d65c40ae503c910. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/NLA6M1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eca24beeda50773c96cd2cb534bd5680dff8744c8539b02ef8aa4a019e21cdb. 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/NLA6M1800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71f14a6fb209f0d4d766175cbb83f848b3b485cbe14fc317e4144d9695bbacf. 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/NLA6M1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2f7ce3d7a63e4976f52d4e1c0a7c0ac660dc24b4742eb44e6fc18119da63c4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLA6M1800015.