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 0x23c6d5b7b2145e847be02d9274c9218617a2f5f773c0549d8dcf9ae6b5422ec4. 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/31f69cdd-3874-4b91-b788-ad0adacafc20.json and https://artists.proofprofile.net/proofs/artist/31f69cdd-3874-4b91-b788-ad0adacafc20.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 0xcbdee7ae905e387b0324ce0bbee4c8cec6e66b4c7b2b55431c85c2a9a54d3ffd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGLS2417089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dad44ea56bbc2f194a495152a4060941e30a606af36a0043643953e0b6f853. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BXIV82093203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d37966501d051db2a5fd3d92d0d8c0e85bded6065e484a47b149f941942b2c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX32F2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a438db08f001714409e2db19488c887d0b6acc80e5a40f42fe5e4ce9ba0d95. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BX75Y2400142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f447bd4d577ce27aa6a7a896bb502599646b0abcd36d705d44ec6a9dc2942cb. 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/BX75Y2300112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4488780e86d4257ab15140d2491fa5d91a7552e4060fd6d3c0cded2aeb24a6e5. 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/BX75Y2300090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c42505a621bb34e6d28e6c10b158b8e1158b985398b189cd05bb8a7ef73f712. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BX75Y2400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14660878e674e7dd8ebba12363bb6ead71556ead6396f2b4bbf035379362a3b8. 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/BX75Y2400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f447bd4d577ce27aa6a7a896bb502599646b0abcd36d705d44ec6a9dc2942cb. 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/BX75Y2300112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4488780e86d4257ab15140d2491fa5d91a7552e4060fd6d3c0cded2aeb24a6e5. 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/BX75Y2300090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4255b8ca8c580d883fec6ca8349f74b678097efce27700b28c9502a876d923fd. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BX75Y2400151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56264c1428c6c2f058c4827c02bc47ec945a1a3bfdd6f253f907234692e3499d. 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/BC6M22407856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec5f78e236d82d37a833baee1aec497b6b9a26542a066378b570ebaa4d5400d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRRGE2401293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c1013766ed8eb86f01b0714f5b9ce024c6fcb400e794b4e0c7a8ff1589fd67. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BXXHJ2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8415adbdea097febb8583dc3a012018768dcdd2ed5ad0434a36bbfecb6091d. 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/BX75Y2400178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf1c4af0d5703f47ab414cf53ce834a884ed3f9fc9a2dfe94e286766dc477b4. 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/BCI932400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a52eab0ffdc89f74566c1e01875b4dedecdc3042b52a909d692d76cffc81154. 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/BRDEP2500183.