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 0x7d579e5b909d7677c8a6cc174135bd61b793d96b5dacf67f43bc34dd2a74f2dd. 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/6325f5e9-c07f-4efa-a23c-63cf5a905d79.json and https://artists.proofprofile.net/proofs/artist/6325f5e9-c07f-4efa-a23c-63cf5a905d79.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 0x3ce49586cfdfac1f55326fcb8aefb613e8590d0abddb013b2e050af46f9ce4ac. 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/QZHN31963362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3068799c625957058feee36b4b11981d8abc0be99824491e6cb22de65ce74f2d. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLG662000378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8953f74cf3465e21211f0b456358f37494bcedd59d12bf25964388d976b2f835. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NLG662000382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909131a2146fb9f416aa372d77e5d08eb8d8d2720db858119ca2a75754b9da25. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NLG662000750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8154c8b2f45404cf18a5a31efb2974a7ece87447cf9c2d6e75b5f7b85b7010. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NLG662000760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a3e297a70b1d3cc3331b2785ef73bd4ab73a9b83fd1adcce0fb0b677362ff1. 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/NLB8R2000314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce84c9794b18dd4838c75340cc807349d4be17d618e10071f1caa2813b3231c2. 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/NLK2U2000382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb63e163af91f595330a2248120d72a77d1b802fef4b3b80875b381a95c24d6c. 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/GX53U2024385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919acf977fb8cf984b5206cb9680cd96dbb3c06ec2df7d9dd2129b60039c8f91. 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/GB45A2002373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e22c2a5ec1066b677010966bf0c7485ae2d4ef56ffac214e08ea421531280b. 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/GB45A2002376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac821dd5064b3b90349ca828d52a27bf4ff1db080eff92a5616000b6cdac0e4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GB45A2002378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7b59aa66f25a1e15acb78cdd70edc4c3668534e05c14977669a9e4d00a05c4. 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/NLG662000532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727b040242dbc8abc97e38daad3d02967119815be34ce2599fe83a3e8fd11dc9. 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/NLS241900519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389d512964ec8f12d83c1e9c683d930fa8ac9a1972cf62e351c5292b8f278c84. 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/NLS241900520.