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 0xd0d34a97d2d1c8cadc7fae9f4473b64bb748075449c99d3a524a892bf2f9715a. 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/197bb8cd-b68b-4a01-807e-83be53156c28.json and https://artists.proofprofile.net/proofs/artist/197bb8cd-b68b-4a01-807e-83be53156c28.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 0x25be230bbfa4cf61a848e95f63368f04dfb329f0e11538dc0c6f46b9e351e8eb. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NLS6R1822113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec16b70d3f16c78897fdb135d141bb50d4f96d2b29ad5a868accce62fb8ae3f9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/NLS6R1822114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2483ecb1f4657d512480fcd94fdec54fbdffa4bd1ff500e4ee6af101c60f5a. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/DEND12229207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00a99aacaada970b2bc3f6df2ddd07a4b4432bae0d47b3ab4a47ddc7a4ea7d5. 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/DEND12229211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7775ac89542ca61d8e9724db1e405275bc2da35d4d730e9f492836709a107b. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/DEND12229204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f934c9be273f125aa195f7a3eecfead4d6129062a10ec46c211768b966330d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DEND12229203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee22091a114aa3a9c84433a83e655ecfb7990c1c0bffd6a93faf1e987c5b45f0. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/DEND12229201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f934c9be273f125aa195f7a3eecfead4d6129062a10ec46c211768b966330d. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/DEND12229203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a36bccfd605647e855ad30bbf12db132abaa5da6e3e5fc7aecc71a7cda8c1e0. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DEND12229205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03c7b61f69ea45681ad16da51c6931e320a95aa90e9f5072d156e4afffbd216. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEND12229206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24d3bdb28ff5c131da0991a0b584b9fdb5276a4f936249c5fbcbd025e03e838. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEND12229208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016230741b8c268863ce717a14ceab3f95166368f87f23f2f1d5f36a7627575b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEND12229209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c9fc3a3a4fa1fb02fe2c8ebafc94ce57d88fa475266418488185209204887f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEND12229210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00a99aacaada970b2bc3f6df2ddd07a4b4432bae0d47b3ab4a47ddc7a4ea7d5. 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/DEND12229211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d4a7197210b21b5c0511aae1acc506777c10e9430a40343d6c122414aca15f. 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/FRX762561188.