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 0x5779e4b53d0daffa7aae3c6502357534b919d08b5032932946917f2d56f89ed5. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5317251-2acc-4c53-a3a1-b8c558309c2d.json and https://artists.proofprofile.net/proofs/artist/d5317251-2acc-4c53-a3a1-b8c558309c2d.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 0xafcb33a395afb136da50c78298a8e9bffe638b37b5f1e2da57c10cee69dac892. 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/USHM92451083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef83b6241fe6d854ab143435964655fe12d1456f6bb74630cbf55806217d842. 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/USHM92451084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706d9acbab7a71780d530e83fefdeb270656478918ac7625842833f59bbee3ef. 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/USHM92451085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa259aa03a25b4c342c39de80aa658369822154c1bec353de7a5ffab8c652dd7b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM92451086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33300d48616f529d803210249dfe2811136b3492f38810b2915c283cf8bba2c2. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USX9P2467923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a2608ef1397b6b805a0e11097af3c484a96b7efb88c91899306a6efbd47dad. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USX9P2467925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c93e23ee5bffef714637154013c7ecd943887c2bc2121a23c7cde5f5a7ec06f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USX9P2467934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179cf5f8490e0c11c9a1959d4ddedb380a978170662a6c03f549d33c7e43a2c6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USHM82524056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bbc7e942fa96cf86d1855bdddbfd7be663c094d3d121d2e1811e2e62674bc4. 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/USHM82524057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e35adf2bbd40dbd02e23805a5b794a294d31fb9ad2107940cbb953084c2416. 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/USHM82524058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cda36b16dc76f427abfe151c19f769064053b938d2bbf3fa41c85dba0b8ea6a. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/USHM82524059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c062fe1a55919c60cbe5fa98c46542ae3f6fa147bc5ddb21c0344d6391defb. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/USHM82524060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb42c532ce419162e7dd612e83bbe1c9461ec12ffcd7c805dda06fe5f42528c. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/USHM82524061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bedf447a71d95d4a4de85185157974cbba43c7c8c74e1c57e2a02a79852893. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHM82524062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6094442098f42fd2faf9d75b8649e39f60c3a457e3202b7dd84e5001a24c9241. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USHM82524063.