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 0xa447be42137f89271354ed018f6dfae94533e55769152dbb6b4d653280036e85. 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/354f9182-877d-44f4-a7d9-848d5a88ecf4.json and https://artists.proofprofile.net/proofs/artist/354f9182-877d-44f4-a7d9-848d5a88ecf4.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 0xcd8e2d32a62d7c4715cdebdcaab18fcc793abc83a1b9d43b3df1847bd475286b. 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/QZHN62324989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125106c53717053f9e40e440e667c5b24c719513afd241f4ae563e382c857d30. 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/QZTB52410709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3caf7435c7817d538a8c8034f4355e2253be4ada2b3005ad09d77ebb66134549. 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/QZES72335410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d7a203a3ea3d771823128cac3832d43e95543813b3ff3d17aca05e96192980. 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/QZTBF2320308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597d86a59c22da830f967b26f6f164e8e5baae0132312a9fdae89dfdd6253230. 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/QZK6K2478257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd4e8328e6e022402bae98c46bcab7b8653559043c767996207277b6095a2bb. 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/QZTB32360287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f61398aff47d1fb713aa5e66f527527c04b51932280c04dcd15d575ac3a8081. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWZ2493916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c30b89a939efca70ea67114c7912ee54f08bd4ff90db37102186837141d417. 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/QZK6N2428912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0c062fe2e73f6ab8107952c97c54ee8465659d3ec725fe1b8cddb3fcd72315. 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/QZES52491000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b896f990bd0ed161d2b66996ef1c33847207b2afe6c3ab35943aabf1b087ec3. 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/QZWFP2377600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7787bee231d826ad17eacab1fe7923fd1a6c2ec7e563cd172b70a939a10e555a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHN52493841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff43c2a68cc242694c83c35e4241fa5617bcbab6e6d2b469c9892fe261cd8d9b. 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/QZHN52466704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbc398c18682d80299744c518bdf146d7f8eb89682a2abb97cb7b121d88368d. 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/QZDA62455935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4173b5d7965e66a1ec3f8241749c10db7d3e460407a11e71da28f4a992d510. 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/QZES92470370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d107339a2ed8a5f6f422d34d028a81678584f55eaab12ebeb47d76a5a38f11b. 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/QZFZ32419833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962a3b557d0e5dfb00d44fd1e69f76307878216355dc311a9ec88062a3fc8437. 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/QZWFQ2301480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0c062fe2e73f6ab8107952c97c54ee8465659d3ec725fe1b8cddb3fcd72315. 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/QZES52491000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9585c643e622e4dfd241b07197e3d7c62ec0c4b433a81edc873066e20fed8d0b. 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/QZWFN2310479.