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 0xccbd4625c6915589d18b927efc177810594b3d2637c4a235a120fadd48a64c4e. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/443aa1af-8b92-4af3-8230-7fabf3060d77.json and https://artists.proofprofile.net/proofs/artist/443aa1af-8b92-4af3-8230-7fabf3060d77.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 0xf80bfd7e64a73f45d8eaa3dfc7b5e8b0c245cf1b83c0bc9d1e302b9e7fcf78cc. 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/QZHN52394863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b4b3ee97b1632ba87d1dfe9cc2150609501758bffdfd77240a7977f8f329a0. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/UKS422200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef97501ddcdcfb43fcb96745f322fec96097fb261a1cb3266571eef07bde445c. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QM6P42481890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9917db0e5668f6677dcfd324d83a270583cc396811855c84a5a4de48ef055c75. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM6P42482404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeca3a99f7dffdd7411ab1c009fd5f027f52840acb912fb503892f4c1659fc61. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QM7282430586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9917db0e5668f6677dcfd324d83a270583cc396811855c84a5a4de48ef055c75. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6P42482404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef97501ddcdcfb43fcb96745f322fec96097fb261a1cb3266571eef07bde445c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM6P42481890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f98b22d20905d201cbce9622189ec68389265b5252468fb5145a55ee887c52. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52246351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6db411c91234e50106cb7ab07572832ddd0f0a7791ca5f3cd4741922cbb8508. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHN32256149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd982f13c95909e22100a6f1c7495d2692760b24003b2ec44897e25e87379e4bb. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/GX3Q92007446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0182051e7b800e0d24d5234d1cbb3db6c0d7007b634f67387ada5557787bc64. 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/GBVPL2300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca9a5252babfccb78fb37c61a5eee29933c08cd466a6a077a614bf9409e2de0. 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/GBVPL2300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe43bd534e533a3e95ddc8bc402d0f7c9e3e7010543ea24721011f716720f7603. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZWFP2422692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8289e4764e78c445f548de450113e81ffe5efba8d556b9e04aab7d55961bff5c. 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/QZWFP2422693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ab0832ac7eeb29b14fc865ad59259d7b7b12d696a9d9e9a6f7633bb2b9e868. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZWFP2422694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e404b2a28502356d12745a21fc5ab343cee6128baa72bfe2ec0d55fcd7fc77. 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/QZWFP2422695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01343be28ff01b87b145ad5a566c7d39a5dfa8192f77f1f48f3d0feb9f37a52. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZWFP2422696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc4c3322db25e48e843f4bea586c91b5dc7527d4b998630f3279bd255e9285c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZWFP2422697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b63d98f14feb67bce6c0b92e59ec900152b398d50345444badd84b9c89f5ecc. 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/QZWFP2422698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7cd1002da6cf8b0e856e51f0cc0f50e08208b8bee4a7a07eb630c8cbd5cdfe. 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/QZWFP2422699.