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 0x9eb2e8ffed0edc01ab5f67bcf2b22a5c4632869562a39eb857f66efaf289edba. 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/20003be3-e988-444e-9bde-2525d906dd25.json and https://artists.proofprofile.net/proofs/artist/20003be3-e988-444e-9bde-2525d906dd25.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 0x48bc8fd3c9dec9f3ad24f4b7756f225a37b67f604480a8f664288220404b5bb5. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBKQU2463854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae85d4ea6d051165ef1f1767557cd4d0cdf3134daf3bf01d1b21ad88803a2ce. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/GBKQU2472362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb817729fbd7640b6bf3f1748bf882598e45db093825cdfba7e7865781baa6c32. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/GBKQU2485680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ceb495572ec8a7cefbc6fc240957475f4e4d178efd9ffe5ccd3eea80f77702b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBKQU2495036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400e08792278b3a244bd18efbb887c6cec10e1914ab791b70ac4bc7f9ac5b5a4. 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/CA5KR2545694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2280e20f96a03ada0f7f4acaaccb4b480439d9858dee5509e2b6cea012d4b0c8. 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/CA5KR2545695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dacf0f985bf193fe50a0a130404dc7c8aca49235b4dc0d092120dd86e695f1d. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT5M22552638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0336c66365fd099fc805f1ed637517024689de9e9bbe56d0951c46323c25ed68. 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/QT5M22569684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f80b566c3380edb38edea8589d3015c359a31dfb1211126c5818e00cba06d5a. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QT5M22557298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22ce9efc7de18e02f8ab5716a9f3cefeaac702b4e1d87f32a6ad8a05792b17a. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QT5M32547664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b728026662895553c7ec55565b3d91aa1f7129b9e5ba7f62f78a583ab9528ed. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT5M32508572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9619f487a24fdc26c912cc0aac5c8a5585510f944f85c96161c3889b7e0deb25. 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/QT5M32587602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0e03d6951920f13bd27bdd7c04014a4fd8c3c17d43e3fedad9b16a2b3cfad2. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT5M42546999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8cb8fb84957a4215dd3340cbb79bbd5ddc3ac713947256c36de96b9131b7f9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QT5M52573295.