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 0x11e05cff126de00aec96b613c3f550f030bd441c6605ab519324f8cddf81bc2d. 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/abafc8c2-f9cc-4f8a-aa27-6a528b4024be.json and https://artists.proofprofile.net/proofs/artist/abafc8c2-f9cc-4f8a-aa27-6a528b4024be.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 0xb0f9d5ae6bbf0e0cae7819b871ce14c5f21deaffa1b189022de3d89a8280b6e4. 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/GBWUL2270733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06c51120ffcbc36deb4a36b74c4ff6d280d719aa6507898c1779e119e86a5ef. 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/QZTRX2275404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cbc530a7dd29d1bacfddcbb82df9188cf3686b30cbb886a135e56d8a78822c. 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/QZTRX2275409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684ed6a565d517101f8327eee1e6e77e8e652b1a6ca08abd29547d8f7b58cba0. 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/QZNJX2172549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d0256bfcf81a62fd9a7c81ad96e54f6b154160b6c5b831ad316ea473301b09. 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/QZNJX2172551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf072fb965fe22af33a3fea8c7d98780644c025c7c640f8abb246ee431cf66e8a. 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/QZNJX2172552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4308a8a9851961b4c1d762c16ec37f41472c4d7519b4f6fa90d3eb7aeb86e9c. 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/QZNJX2172553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c1c69dd8f3ced95b32445cec7f20c2c61456a7ad327cf9f4f2b1b9040a469f. 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/QZ5FN2409021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566dea70ada673974baed49a4470feba7b88319ca8ede2b04b86dce9237e4802. 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/QZNJX2270248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966cad6c0346e2ede5ad4d8cf9a7f0ed7d01b87a2d43b9d5484a9845f78b3f0f. 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/USLZJ2218410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc2d136abc9be006d73b49c83e5bb3dfd5307022f8215c1d7ea76e57f080acb. 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/QZ5FN2282927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe078dfb96877daa2deb88db367dc690b4436d9db41ca0fcbcb38ae47129e50ff. 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/QZHZ52178021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ff6b33dbd600d54c8200fdcfa3da3077dc95c4d6512349498e97fbc0f30d70. 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/QZGLM2177143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe471df0a69292b56ba687e09ded13bdb4360653b7114f7f6064dad91b57d85. 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/USLZJ2237174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46fc896d0fdb1d5c4dc9f074588dc6dd6521ef27d4203592022af9e1583d1ea. 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/BKIG62300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf67cbb0c02796ebf07498479f8e19bca654ee519cfab05f735d62fe4fc8fd9. 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/QZZ8B2411984.