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 0x361a7a7a1eccef4b49d107cecaec86253345c462e884143a9f954afddef24d77. 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/8a9a10ef-f778-4c25-89b6-c4b96d32ee35.json and https://artists.proofprofile.net/proofs/artist/8a9a10ef-f778-4c25-89b6-c4b96d32ee35.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 0x5156c4ac5a7f4aada00340431a59cc24e497a9c13806cf0778fc92d77f8363e1. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QMC5G1500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6a30a9989fa712a8d7e9ad49006524404b3d66ea3cae6a54c8ca312ef64f9a. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QM2PV1826519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2efe469ce70945720fefd0491cecfab6838a5daea1b351cd8103bbbcdf3488. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZES61895113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97edab7a591f542ee7641f8c5a5049c56d48d38e3b9e8443c3ae13d321489bd0. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZES61895114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043ddae860a6bc2927685d6ff7efcf79fc884dee30f0bac9d86663a5eb0fcd2e. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:30:22Z), 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/QZES61895115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4906615e83c148e2198014856af66b7141f0240efa235270fd82d1d4a5aebc48. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:04:29Z), 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/QZES61895116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5214b7b46a90318a91be64612a13333f0f7b412ffd11756943b6101829799843. 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/QZFYW2182571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9b8ba52095eba9990f119da039eb8e0e5bbe9474320d71817ac53083170beb. 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/QZFYW2182572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95546b0c249a9760d2058285660a101fae793771b5bceaaa5e91a68ad11437fa. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZK6G2429211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b91cb51b93f17bfb364a948878db73f41cf04338e46e201cd802b0a86d3de7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:07:38Z), 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/QZZ7V2475359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479f98aefb33bfdf801b2b0eeff73a01c22da66a92d8e7e2c22e40fa70e8f31d. 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/QZGWX2159340.