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 0x378bbb6b49e0a08bc174600b8b8c64a369b3734673014d40c6f92be68b616637. 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/d7e555ac-cd8d-4b14-9f35-b9baf8d757b5.json and https://artists.proofprofile.net/proofs/artist/d7e555ac-cd8d-4b14-9f35-b9baf8d757b5.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 0xd4d69ca5867d44dbdaab675afe63c9c3732bdc3ca302345d077b292371753f47. 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/QZTAS2141996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e6db941b52103f6febdb55d128a95f6c807fdbfcab368fab88271e3f83fb99. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZHN72279333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc636d5f1b1e5ce6b2e5899fb7d0b61415d5fb0a5382c362024082058a5fa6ccf. 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/QZHNC2254859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d8b7f0fcbef984d31919d9aa02dc220ab820732763cd5f5194c923e82b2358. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZPLS2266453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff5b86b5b174655ad0f6bfab76417f95acc4f28c99bd96eafdcda00787ed418. 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/QZDA42396081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57668814d48ca6b094465a8adb11bdfd685839bac4c2e95e0c32353e46fd1e1f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZDA42396080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff5b86b5b174655ad0f6bfab76417f95acc4f28c99bd96eafdcda00787ed418. 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/QZDA42396081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c27d2cd561796e88729b2dadfeaa4646fd1a5d80532116cac5fe33789ed1483. 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/QZDA42396082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28952322d310d1138f198e229a2bdf52dedd5c59f1a67ff37b3d3350d314b33c. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/QZES92377484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb082708ab276429c582a02bf0aaf4b466477429af2d7b84ecf42b0ca024698b8. 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/QZK6M2352604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2fcce2235e6023da6daab24181586a97380011b858f85af5afc95b9af65010. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZNWQ2305739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe876177d95aaea8db85097b392efb323d649b9f062836e60b06d3488ceee3a34. 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/QZNWZ2335032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9682d7853b00c46d6f795595157fa817e61c314d4189c7f784297a8fa8af5aef. 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/QZTBF2387533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb082708ab276429c582a02bf0aaf4b466477429af2d7b84ecf42b0ca024698b8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6M2352604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee7282ac0e9a932fcb23a4d97ef4dfeec9867909e5d6a4229e1694442fcc4ff. 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/QZTBD2343422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57668814d48ca6b094465a8adb11bdfd685839bac4c2e95e0c32353e46fd1e1f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA42396080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e152314a08c521a6d85138ff7454ff42aae4a87cd9c118415b9ab8d2529ec9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6M2352605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb801c237cb4ec569aa486e8249d7dd308ed0a9386eec405813b1c733816994b4. 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/QZNWZ2330597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc443f7e65e4287cc5540750f4c7923fb52fae9557fa6e2b4e0ca25f496361326. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBF2387534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe876177d95aaea8db85097b392efb323d649b9f062836e60b06d3488ceee3a34. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWZ2335032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c27d2cd561796e88729b2dadfeaa4646fd1a5d80532116cac5fe33789ed1483. 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/QZDA42396082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651e5445cc5cf5d231d87344f95e846f84053fb80cf62fae62d12363b39d7909. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNWZ2330596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68ba1352a6fd0d2c71d4029b8a72068359e9dd107af572f15e859e0d00c5398. 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/QZK6M2352606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4baf311bfc5aa942bdc0e370907298e68c2347c101f575b1c5fda0fcdc747d42. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTBF2387535.