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 0xd3153cfe85a22db5e6a97b4651f282d59c13109a2dea87b4a9776417e26d8f31. 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/f90cb7a3-f26a-43af-abba-37b4a0b9d9ed.json and https://artists.proofprofile.net/proofs/artist/f90cb7a3-f26a-43af-abba-37b4a0b9d9ed.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 0x458b6294116e7a466026f8563e83c24da3fbecdd8214df7e110c749f3624c6d9. 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/USCGH1882250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0ac6e2509c051977d380eb773564f81b623ad6e277eee363295bfe45746717. 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/USCGH1882252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3252a4cc9d6e677f3e4bc8a1d15d63fd48d3d61ff89b5ceec8e0c7c062ed49ac. 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/USCGH1882253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d2d743114a350f4ed648fe434a9b513f3d458faddf05e4d27d1950bc6d72b9. 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/USCGH1882254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cef74cd1b283a2b576757ac81f11fe178583654557f77a57638a9e25fa57c9. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USCGH1882255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d01da738a91abc349a6322bc582c826e7bfb1fbf2241060d98629809e6fa4a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USCGH1882256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c0425dd3455a2aca81fbfd3ca247960baec11f3d56e7492f8da46e85d9d597. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USCGH1882257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688d67b82537bef14b081b1695d4c9149976be5e5aff20db694fed9c2d7e8c4f. 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/USCGH1882259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ce8fd26a2a9e8698300cc1ae510b34736d07b36062bc6c8ee17b631764fcc7. 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/USHM80408248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdd885b052fab4690b464a573431ac1bd3daae255dbe3f7aa1cd9515f9ac793. 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/USHM80408249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983d593270ab56aabde026e483d02da3a5ff30f8a96d005806780547a526e928. 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/USHM80408251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2ea7c649e9db3ca045a713f1f3073ae3a6881db5ad6c6d5a51e63d8a3c8166. 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/USHM80408253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0696275f26c16237d6aae2c8a604f830c056a79c0b371f6b4c8100f008432f7. 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/USHM80408254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d9142c0d375d3a51e36d5723bc52ec4879a286c9a835c5b72d0d170741d367. 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/USHM80408255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde6321e8c1f54273a5b334befce6225e0d93ae1102c79a6cc9e688bbb3de9c5d. 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/USHM92214015.