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 0x2c5e0277a2d989248e492ff5fffe269eb99af430b6a2edac47821cc451282996. 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/22dd8b45-2977-469e-a3d4-61062ab36b89.json and https://artists.proofprofile.net/proofs/artist/22dd8b45-2977-469e-a3d4-61062ab36b89.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 0xe0fe338efe3999848e9af142639bec8d352133fa72e534872afb1ea523eb3651. 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/QZWFG2407918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380d21d65633888e6c00d19cc714055ad801647bb5c12e103101a842d28392b5. 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/QZTB82419188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d0c183111532270dfca18c5c74d8c0706503565bdc375a95a555020c6a097c. 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/QZRP42482665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b0311ac534b8189a0d304df99ac3dd2ba6aff30db1d7ece637c741fffb849f. 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/QZPLR2473754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09623fc5adcfd310e42c3892845d0b5444041cfc607d42d32aa64a2883e22fbd. 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/QZHNB2466067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba4f1870900a6e8a6eed5d59c66b07dff0bf4213427c0de4b11b70c0329d31b. 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/QZES52416256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6298e8c5ca503b3f6749f01e524b544a446ecacbdfcb5d4a9bdfd591e9d89a7. 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/QZFZ32425481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf464ef8d113c01c8e29efd01abb1dc69f316205687877b9dedac5cd3074be0d8. 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/QZWFN2342797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ebbf5a59932353d202348731f72e4e00e2be2725c745ce8f578bda812c4e2a. 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/QZWFH2398793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa501055c0f806e8946548f82f9fdd40e886733baf45c1c07d572042ecf4135b8. 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/QZTAW2325776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78335ac61dc75d53be446456220f9e7e99a232aa16c0a7102af9f49b26ed1621. 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/QZNWX2320860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acf3f9bce426f0b2b9a8a604d19478038a470ff87b7df980b9b7b7b8616a7c1. 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/QZNWV2310180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4248fef620137cc82c5720a5b39053b4d8de7bb04b884e1306f4a3cd5d217a2d. 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/QZK6Q2315851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5be982a0f6b224d5d2c59b85065f8b6e44162fd3826d104abd52b5bb30d695b. 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/QZHN32313454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1b07403adb2eb86a9e86135a8dfb3675cf762ee2801aa9a09f575afaec9705. 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/QZDA62368158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90e7569e76afc6c8706736a338f7db86fff1457057afab56c6d767ce4b45389. 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/QZFYZ2318441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d71f74240c98c9e8fd8b1f7d94072c01a4b7310d0389d905e3acd0e69db71b. 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/QZK6H2217305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49a5f26561e98c2125ec310643235c0b999ac4a2e17a1b2bc146be1862d2bf1. 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/QZK6G2212216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32110a7c9f0c9e6ac344ba7026153768c894e9fcbf7eb01da7d7ce3fbd02a5a1. 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/QZK6H2231739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972ff1bb1cba5a6aded1beb27afa627cf8205ba7285e98a89b18ca84d47a16f7. 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/QZMEP2378948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450a515f72d57120ee1ff7f462f1f5a4995966aade3496897a0f2cf9237d91b8. 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/QZDA62548979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6350abff4414b5991702936ef78409866671457b1dab508a6e4a2af6c8aedf. 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/QZFYY2554408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15eb5c4c96e1a0b09aaca0320baf513f08cbb897aec078597274603a56d18a8a. 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/QZZ782400421.