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 0xa9637a964507c0a5f824195ccc53473a05219bb17349daf0b2900f6da33379f6. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca83be5b-26d1-4ae0-879e-f0c9719ffd10.json and https://artists.proofprofile.net/proofs/artist/ca83be5b-26d1-4ae0-879e-f0c9719ffd10.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 0xd0dee3695ed8659b8689bc82eb21495ea942d21d4d16ba3bec57a872a2b0456e. 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/GX5MX2538164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad2f35acb8c6c2ad56a8d8ccf2c31c0f0d95d0071c6379e7283a1ca5001f1bd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GX5MY2549635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35cb1162268d0030b2cfa6d7c33aa522c554c26f63c6111bcc9dd3c1058b959. 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/GX5MY2523742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025b6a63c52162541f8ec13ba4cb99a2ef0bae96574d3fb6d7f7f571f3779e89. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GX5MY2576839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b1c6ee0fcdb8cfccccf1c933b2b003d953617feb57159bc99bb98ee2a58387. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GX5MY2576890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda914b121eba0a56ea14a7ecb9ceb2a60f043e336e28d0a3f37eac4d8b559788. 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/GX5MY2519847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a2a9c6b7b95a1d6cf27021d157d8c81446e4351d9abfbbb7cea394c5c83edc4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GXESV2571373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3230e64b8ccb61b79d75c7cc35beffdb441d916e68bf2b382c5acbe28f2b757e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/GXESV2569282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dfe414babc23b838dd3908b3076f9072f1ee85a5def46b02dc78e84a43ba701. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GX5MY2577519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7a5133c5d0b8e54c146e263d226780a8b95f347028a0d5d2d1ef56917efe10. 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/GXESV2569396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b773cb8c311fef9cf254a1901df04f75f7425b96f6217be013e8331bfc50339. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/GXESV2558416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cdd3b48e7e442af115f96b076e285d582fdf6d8b46e9ae230084e62e966fbc. 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/GXBDT2573273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca99fe5f6e92fbf535c85dbf46c798671a77c79b4436b092ab5f5d7213a52401. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/GXBDT2525177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26fffac66114fcfd39298568b4859ef3924f2b4c866a91881e9d50b3527a7645. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/GXF972592743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d90343bc73ff77f4a5b908698aeb834c5769a59ac72cbbed8ef9bf12728cb8b. 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/GXF972582529.