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 0x4b26126d4d7f380ff71ee8032a90b175403f343895a6a291012893946612485c. 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/4d64b296-8d3a-4036-a18d-4db5fd228a23.json and https://artists.proofprofile.net/proofs/artist/4d64b296-8d3a-4036-a18d-4db5fd228a23.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 0xd6216b361f5efe24ef77380b1ac032868a682d9d4a7bd225321c01035c057c44. 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/AEA141503628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578cf66b6d29c0d0972a083738ab4e560859ad51df50e9f1c866da46888ef42d. 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/AEA142402906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabfd48ec46fa6735e98379e8d1977929a34f7a96b269a68ccec6e7c65aca430. 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/AEA142301578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc3e303bbc428b67dfd51cd37bc4a878a7c837746afd05c089a37cca1368f78. 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/AEA142300205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36410c6d42ca4b5fcb5d97460efff4ee595e637bf87ade5f16399a1c2486bb2e. 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/QMFME2201342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b70f072f5cbb72c27de4399a3109537a3d70d57343ca787b4487a235be2b90e. 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/QM4TW2262155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3963b63965d6513a024e3d8848b5a64206848194c6ace401d4b3bebc7a6cabbe. 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/LBA132101156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794b3928d44a745f897dbd9e9ce9c006cef1a5c6ab7cb46414d0069ef250ede2. 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/TCAFW2142021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f777c387e4df9fcf4ca493f14f9eeaacff17b498da7477ea0bd36700c8834b2. 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/AEA142100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94848d3abfa0fc201f78dd40aba7529ff32b4aeed247d8aebb19315b5a8b0e2. 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/AEA142100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24a43f3dd3f3ee3c42b3b4d84d1602a24a639da5c7c4470553e61db14232e25. 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/AEA141901796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c56d5957a6d409a629e69f0baa2740c72bc6af1e78d57104900d9f6dfec4dd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/AEA141806803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df9139a649452f9f767e23ff22ad32497ef7b60a81c3272774871b3ccf9e421. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/AEA141800122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5e85e623576005ac282bd823146a9f5e4d3bdef356b67a373bba4236690f62. 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/AEA141700679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ea5913721cee43f4750e5a705abcff3441535f40ee280850dc57c80b7b8dd2. 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/AEA141604151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c38f4d7b5747a0e947d9109556305dcd91ed6e5c1764ce482116dc55d8abd05. 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/AEA141601178.