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 0x52f55f5fa9432afc0eb6123ebd75db3ef5715dadcbf0544a3886313cea825623. 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/1e3bcd40-f86e-4008-b7c1-96201ec031e8.json and https://artists.proofprofile.net/proofs/artist/1e3bcd40-f86e-4008-b7c1-96201ec031e8.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 0x10b9a14b69ace484a23a216124dc378ed187365750e938160a79a06a263d5fc8. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:06:02Z), 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/NLCK41058453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cacaa28e1960363e57fe4322a3c5ae3e6edc93f5a5e65afb32f35cc0d648c6. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/NLCK41068331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c7ec01fc33bf22f0c1e5ce353f2ed20821acdbc05b13c78e845ae59a713c7b. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/UKFTL1600213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bade9bce8c0591814432ab80da1add2869bc6e077cb07b4bc848552e51980d. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NLCK41082248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd83b3e14cab065aa3394cb47d709160ed14b7ca9ce53792aa21dc2ba954b30. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:39:24Z), 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/NLCK41094541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7c85b26c34f78479aa7f9258f8b90a0f0826c3ee45ae8bac3e75f438633ebd. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/NLCK41099913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826496ff6a20fef3d3f1e5ce958d8d846801175b4ad54a72d7230b572a6282a3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NLCK41099914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3a244eff5336d33a5517dda4773e2ff3177648d2642bce5ac24534451c6652. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/NLCK42214806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700f9b50b92cb54f62ec34a8a15fbcaa7445e04beabebcf25135a05e0a789536. 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/GB8KE2301267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391c092b4396e849648a9a1bd26dc574fef1d49760f93b6afac2d2aed5c3e5fe. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/GB8KE2301269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d09908dbb0816e8c3ab48a3ec0c880db9d235ee21fe915b640b07abdd033ecd. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NLCK42235312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107bab576589740b3d73bb27afbdf2f22e5d27cf4cdb866497b86923c9fdbf07. 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/NL3M12412357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15008522f37a09bbbe12fd28449002e070b286a590060c6a9349791535c5529a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NL3M12412359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0456acfd4b1d50260a84950863fbba183442bcddd225e3911cc1ff3046dafcfd. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/NL3M12412358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5e876df53532070c545174af7b5dff83d8051cd4e9686d3c4745fcb9cc9ec9. 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/NLCK42506051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ff6b40e5e05e64abdd97dd97c2b2e6a23b2511f8b73f0263f638d8297ec6dd. 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/NLCK42235630.