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 0xc42e215528fb24f2bb5bd5b12703a66c44a68ca0351e5d8363139e0c4f6ceef8. 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/074f7e63-31db-4ea9-ba0f-971ebc3111a4.json and https://artists.proofprofile.net/proofs/artist/074f7e63-31db-4ea9-ba0f-971ebc3111a4.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 0xa62c2b619e1976763d83df8f69d6b6bd4aad3491e8cac425b8f5697e1eac26f1. 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/GBLFP2387862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af303f95ed0d3fdd6580dd5d9986f0006fd34ca3d44218ffc8845da8d81fff8. 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/QMEU32311344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa32a6c62ac64d7086f8bb11255e9a1498eef894de12d9c591e39ecfea511e87. 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/QMEU32316131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1faf1f2be73a6a90fa031dccb9f66614941b6754e70d7b1542b870b80fdd698. 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/QMEU32316132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371d35ecc7ffe43a78f974eab1bca13989bdab9b2ca5a07ee93174c1b1a309fb. 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/QMEU32316133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561cf6b539e136c17e2ed5751572f3d3372900537a79e26e1f7276323b3d3f42. 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/QMEU32316134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e41c8f8e18903eb3aa588c5a06e2c47263303ff0def994d479b4a070598cad. 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/QMEU32401970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0034f3926e9371699e04c6929ea5767f9e285bc6c32b7db4ea040a54ee1d78d2. 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/QMEU32407088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda97cc9588f564cff4f959aedee4c8799cf3fe87b17a5419ac954d3d9ecbcd12. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/USWL12504227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793c4f559b664c098159c65bc67bdfc33f9e813a1955592f6a85e824b6223bd0. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/USWL12505189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cef4565bdc0d073de5b1c4d744a65a10e2d256e697bc3d0f1ee814dfcc6f06. 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/BK4DA2319421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f896545f42bea51478ca134a94547dc19700e6ceff4064f28fbee122c8965d. 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/BK4DA2319427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c18db767bda3f661ac4e2172e6126244a69e2720c80993434559ad8517c972d. 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/QZMZ92433390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e41c8f8e18903eb3aa588c5a06e2c47263303ff0def994d479b4a070598cad. 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/QMEU32401970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf23a6a87906ad2c04c28383e0c9aacd17a70353aa0c538bcb3233e96ed0e19. 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/QZNJY2445741.