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 0x543447c7e9c814132756dd81ead2bff2f3fe185d5c0ca33de808a8ce44015e36. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35242733-ed0f-411d-b2dd-9dc36f80d0da.json and https://artists.proofprofile.net/proofs/artist/35242733-ed0f-411d-b2dd-9dc36f80d0da.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 0xfc28e3c718953db401a638ad70bbae82edd624547997fda2648afa74514a9000. 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/SEVVF2201101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd39f218b76d913e50a351d908de36df6540c209a31607914184dae1bfff260. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEVVF2201102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24ff12ce62be711fa8a7090dd6baecf9fa2557a38cfec3d995e33dce9acaffe. 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/SEVVF2201103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a9b58b616d7ca595378c8d43eaeafb64d2d472b4fe3e4781ecace96b4bd490. 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/SEVVF2201104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7120bdf41c31d035628a8f62cb6b87dd2c4bc55b2ab5a052a5d3f1cd511c97. 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/SEVVF2201105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6858b0169e54870339d94e69bd65b861f38e00c08623126d4711faeb8c51285. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/SEVVF2201106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378aae67f2dbc4d97c2d3af91af2a70482c4dfad3d50736262c11f58060bd6bd. 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/SEVVF2201107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d598962ad7912724f518e2594847f3eca4d7c685cd048225310b9b6a05b2b11. 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/SEVVF2201108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9040b4f291c5ce53be7f31d583815ba69bd71a9a40be390d6fdfb858c0454379. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SEVVF2201109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe135f8ff52fc3e24548bfc672d5c513b2dc5912e68e49b16e87c725c4a43c8b8. 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/SEVVF2201110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb329d4a2a947a7b1b5abdbf05b613f7127c0962c531453c8b3ac3819a5271d8a. 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/SEVVF2201111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2403a0c185652c89195cc2a1e64733c449dc27700e2984f88f71e498833a96e3. 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/USHM21853323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6435df77786e1cc3eab50e8facb27c20548428c986dc2ae1f1fe5d1d90740d29. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM21853324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e9eb2d2aab5205e436c52b43d7fa1fbd5cbfda25d86116ea5d66a049738e50. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USHM21853325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ceec046229efe8e84f614e7aa9c4921ba595bbb675c92650d539a902b0a845f. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USHM21853326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9113e14204be665f0d74efbd8c72a3dec5a070feaba3df432a3c06a6f6eee4. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USHM21853327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729e931272d8ceb4de46aa5fb5604007f5b353ce84c6be5ce98344d5c2f5cb6b. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/USHM21853328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd918bd4cceac228136b896250031a9e56919ec0aaaea3c04397e682293da3484. 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/USHM21853329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16e8cac73cbabe842692044062d47a7c99a0f464cbb774baec3f1f31be1ed91. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USHM21853330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e38506c5a388ec8580146ab09f9faef7a772d40e1ae9ffa967bb3ff819ee3eb. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USHM21853332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa510f253e11701e9bc82b15fea4914c18de02c83a0020cc9b4c6fab552745782. 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/USHM21853333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8edae83a05c8f92752d502a70ff1ec9023efefac0cd73d53c112c5608487c3e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBSMU2863018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12289a1ab34e866775aa4a849a678c7645e50c3440e502ac728b3a1e4a533b72. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/GBSMU2083415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4489fdad400301945f245f574219b3bab10a315b06672c127f6f6771838f5fa4. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBSMU2083416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92517038b28604082ee67dcf872543dff073c0b6262e4425ed3a438c64a3eaa. 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/GBSMU2083417.