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 0x81a82e8d55b81d29977b7ac55bd9cc072e8ce1123a627d580fc110b13ae0c104. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/169be16f-99f6-42d4-98ec-e125edcb8755.json and https://artists.proofprofile.net/proofs/artist/169be16f-99f6-42d4-98ec-e125edcb8755.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 0x89e8c21b1277ad726ceb2b02303a8b400cd60b2b4cb98517eb0adb440a008c51. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FIALR0600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420450d6a3fe74c590ed8155faa990a854ed4d398beccf8ef19242602980a609. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FIALR0600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2835ba7effc0eb51b900f01f153d184e3d64fc5ab12563462fee01b27969f37. 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/FIALR0600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1eb1f02b4cb9026080dca06f6f2ce326f1e74233fe209ddad5fe0c6883ad24. 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/FIALR0600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb072a0b00d3125c03f146a8ff10255d0c10d6c0fef9cbe270477ccf99b81a088. 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/FIKDH9900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6bd213b85bd3c9349f453bfe69639158a8e479429903f8447a213654385619. 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/FIKDH0500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5934d4f7c6affdc4f134d27cf1da5be9cbc9ad44a526833edeba9e6ed67788e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FIKDH0500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f635db1a292a95d548040f689a7d342e854fc4be3afdabc79022b1c48ca7752. 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/FIARA9500061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fb114f30f2fba3a361b02dd56bdc6312d54a0e5ea387310efabb53bbcc14ab. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FIARA9500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2142cc8ace6febd81633c2ce1d97302aca089e3d0a74ff8b9d525bd0b1ffe4c. 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/FIARA9500066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d845df1c2e95940d515e215bf03ae098cff9b116de361d4d6fbdcc11288e4cc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FIKDH9900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27317941ccf6b3c430348b49451ae447b43b7b65e41f1bfad1a45ed2a3b67e17. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FIKDH1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bf20b0122787f16aefb1253a30951d3d0c21c2b3932ddeb6d5c44e0b8a4e7f. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/FIPT60900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6435d5622edd77fe4c126bde56554788f890716c060c459605c8f16c36dbf7c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FIPT60900056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d81c0b7f601f2c8a85af63474b8749e83f5e1076d52eeb1bac5c3c31ed367d5. 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/FIPT60900059.