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 0x4de02666f8bc3c3402e2374c41db8c31cab6a94ad57a6e6a5afb89ee6ff065f8. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fa68b36-e66c-4377-9899-d969ae4c9b46.json and https://artists.proofprofile.net/proofs/artist/8fa68b36-e66c-4377-9899-d969ae4c9b46.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 0xbe07fb26627425a053602d71e3c3e2a83f21dff6cd15a9033f04bef1ade6ab15. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNMZ2478452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648b116c4a6f5e65011b9b47f4a49be08b7a2c8eae5cf788a3860140b19344ea. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZL382561116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e2b0002d0d1dc851dd6fcb0f31f3da9f1a3b7daaa6eaf2d32e1d7fe6f72073. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZMWW2597980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cf7487c1ecca83bbf3cfcba46c030269f420aa91a29cf638924edb20811b52. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZMWW2597981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04050af2c9d8d10266f733d90f3ed3a08cc74a3b95128c44021c313159a5b985. 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/QZMWW2597982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecd1f90980b28876534cdab1f287a6e55eff8edb73ddccaa8d40d9d0d9d8425. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMWW2597983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc601127bc69cce5dc581e4b047b8667699cb70c3fe4912d075ac634c09c4f480. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMWW2597984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943c20d298b0ecc36414d648e5d0e87853bb69039c8288ec20fcd74dcaa915be. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZMWW2597985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a60018251f029725f81d17e6747ea0324c9b00a8d2b7e5c73bdfd8874671da9. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMWW2597986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fad0e8c317cd696d61d8c8fa047095fe429d5c54ea72ebb93e1c7a9af27cb3f. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZMWW2597987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd4f7ad41bb90d983f203eedd9e92f8fd6373acbbd262063c4e1b944fe579eb. 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/QZMWW2597988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425301b54a27eb1af17d399a1e77baa773340405bf15ae29efc480dbdb585c13. 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/QZMWW2597989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692a5928abde03c390db13390a313264655cb7469405c9769614f86085b7d776. 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/QZMWW2597990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31bc44f26dfcf50e11c97d4a1993cbfc27bc0c2dc130e43a4c2fc8637ba30d21. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZMWW2597991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b00413ae50997d330961120ddc2c99aa303f912761793348e3021da8fb1aa6. 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/QZW9M2417549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46343560e759a4da9bc790b0262ce1b320b22c9b64195de01132ed88e722e6f5. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZW9M2417560.