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 0x6aeb550ff2d1bbbe18567d38a3e39357c6ee42b6752233f9c03b385f746534b5. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad9cbe56-f4b2-4a0a-b9a6-a56926108a80.json and https://artists.proofprofile.net/proofs/artist/ad9cbe56-f4b2-4a0a-b9a6-a56926108a80.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 0xea6a4a399592b769ca89c00cd0d8c1e0743e1e611653b9a9ed18888715281836. 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/QMFMG1313356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce8f82633bbbe25a54d0f671828eb5fcde045c3ab8272fa9d24e2229b45ccdc. 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/QMFMG1313357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6949d6154cab54efe09f2a46dc6ab08a85db096d321c52e74f7ba4ff6b461b. 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/USV291432626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec7f3fa2a45ce65f0f295b682a66868a1642b83a2070ea155361e85b5f117a8. 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/USV291432627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc485486d1efe8e17d352db926b0bf40e01870705abc6e0ff3d1f2ab0414ddf. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/DEKB72518080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9ef18000c0d9db8a463d2e70ac6910175bfabc7b2af79af02b7da0fa331e49. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/DEKB72518076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edea4c588bcbb18f190fb45643ae0173763ba7b612ff6d52f528e97aaa8f3c4. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEKB72518078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0a63530e9bce0c97697172a1305653a1f9611f9570baa613251cf9b8a7e872. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEKB72518079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc485486d1efe8e17d352db926b0bf40e01870705abc6e0ff3d1f2ab0414ddf. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/DEKB72518080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55c51145211ed32c4f9ec742a5f0e58ca82820b61571bb59aaade2b47f7ede6. 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/DEKB72518081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a3e2cb62dd972c7b6905750c33f04be584dcf3863b12a30501ad875f1df703. 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/DEKB72518082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddead3e6a6c339dd9429ecf1356ea7ef6449c3cf8dce93cde6dc16a7f7230ea. 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/DEKB72518083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd196bfb0eaa8cbcace8a3cf1588c003ffe5370e8720177bf97085268b5ea5c. 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/DEKB72518084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1854f93b78e6faa4348dcbe50667b9e59e0e7d48ef8923a80bf03cb04f64817. 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/DEKB72518085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1a22718548764bfa271d1653b0ad21ac36695587cd5ce482c5a9d40abad189. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEKB72518086.