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 0x2ea48b7133a91ef9bdc762000f9195865ed7088c8376c29edf283a6089bb78e0. 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/6a4582a1-4c8e-4008-9e0e-49398159e486.json and https://artists.proofprofile.net/proofs/artist/6a4582a1-4c8e-4008-9e0e-49398159e486.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 0x97fb2bf2338045ac12bf5f15fa3b4fe4dfc0b3d4a31e0e5c4d6bd70415415c64. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWY2268251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9808ddb7e67bb297d4d0fec2e43929e9a99963a0833f6c7e119c96959e768c94. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWY2268253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bfb82a085f774ac6e1cdac33fbfd42e5d19ec06f8443f278db8b3bec7c7f07. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6N2356492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae0a9344378fcb16059c4550bc53521f64736a9e3012305858ca5a1dbfbc0a0. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZTAW2343877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cf716f0c7b6abeb43b633c906236551e885a895cdc250b510bcba5d3a62447. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6L2479143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa71b77b2a5db3835cc69dbfc84c530be94e99f27511e70fe3eafbcb8f2cda2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAS2415843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ac4de1ae687348b70be0a3880dc3be935218dd686772943cf5823487bd4eae. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM7282400825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93efe2ad23e99a27375c4f6aad62cdc738d5fb1e00955eba8c04b0c0fdf7ba3c. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZTB92408881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1120b37d5dbf7ecb113d555c40ff623ceaa3856c18519db9384c1ef9814fe6. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/CA5KR2505999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f42254780c7ebd8b16915a13a19c51cd4375d5c3923c07e8434f264489b794. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/CA5KR2509885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd673a71551bd8783cba0b705a3a2d7fb3eb5bf6f451bdbdb629372866bbc8c79. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/CA5KR2509887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ae36b58390994828e4e8239e5c6a37e8aeb622ef5a9f4327cf76c450e30589. 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/QZFZ42556984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3c9012469e357be177da6d7c90e144729f5a44f17b360437dd98dd9104f264. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QT4K32534665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4384a3d2d3c1a521fb8851ba5fc0d59b659423419470c609dbadb6f52282b735. 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/CA5KR2537338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36efa266931e0842f52d601548e453d62b363a6be77c864d5f1c3a1da11a41fe. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CA5KR2537339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe52687b8273f53c9f31dcc45266a94b948da4f30a385dae1748212e2169f47e. 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/QT4K42560149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dd1fab6a2241d4dc83e222b1c6f506b74a5465d212a18b6caa645f39897513. 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/SE6QE2407640.