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 0xe8b28ea5d3a80d4cd23026d8fb800e7a3aae9a12f75a556306aabdb801c3ab26. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7f9d403-c298-40e2-aeac-4fada99149f0.json and https://artists.proofprofile.net/proofs/artist/c7f9d403-c298-40e2-aeac-4fada99149f0.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 0xce0021ab693ea43db09b5784a6da55b560e135e2656e5db7a89cf02b5690bcd2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRR7U2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0021ab693ea43db09b5784a6da55b560e135e2656e5db7a89cf02b5690bcd2. 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/BRR7U2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8a46b30f8d345004dd83e9a56c8c9ffad9967924884ecb4ca19f0e2461565f. 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/BRR7U2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84bc604f412726dfe647c4597dc2305e37ba748769484109965b75557ba0cb1. 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/BRR7U2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb8c899b399a1af8c571dab64dd693f5031a1f1ce80955d2330c479642136a4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BRR7U2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b307f27b82e3435b25c909c0037eb0b7d8255adeb2a07ecd8f0fc837ac1e794. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BRVTJ2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0dec4629bda92966afaae76f4d143683a710374ee9f5251c681711039572e6. 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/BRVTJ2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b40529450cf7fde99818f76b320d19ae113a01f72967f1708b93ae7a537cc6c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BXPOB1800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4eb7536afb77c65a4081a9aa8af8aa6b1d1733b7ffddf27b54a616f85744ff. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BXM2K2300014.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9049838324f0c9026624872614465cca7826c681f7b1e7d96d269c42f7e2cff2. 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/BXDGK1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a51736792c44a6f4c1b553b483e82a62b19a33ec1f7afdcc62d0261a2d632ce. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BXDGK1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4db7468a41ea266bbfc26f9f7c5d600568a7e3d02ecdf460d472dbc03184b8. 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/BXDGK1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9fa8e27a4c17f86679c9f5abd2c8ef50ffefaa25a2b283b4dd09deba196268. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BXDGK1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb497d7bb40b2c61f2e920bb6571cb7c38a857a69bee5f3e1ebbbd486cc9bae83. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BXDGK1800007.