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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 0xe3acfdb57dc202b62f8b0087fd5df8ac53346f81fab2459def42450ba2d13bef. 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/260acc0b-f718-4ee0-aa3a-7f39d8b3c410.json and https://artists.proofprofile.net/proofs/artist/260acc0b-f718-4ee0-aa3a-7f39d8b3c410.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 0x433fc8805183d3d61ab1d6ccd39431cfcca629f1a3a8b48c6942ce69bb978bb4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL4AW2430502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad57f9dda143627960e6b42a3f37990c7d729f3feed4710f9de3df4532408f6. 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/NL4AW2429902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bac234c724e764babeb167b52b7f534deefd8dd4532574d939305b1daf94bd0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG3W2400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90c8ff118b2e5751fbc77df59e7514f3575395ba366d629666d28fc62867a08. 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/NL4AW2429302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7b72e30b6ba268e7cceb6ba3ca2c4bbe424e3b4f8b806e71f0e08f517c5977. 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/NL4AW2428902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca6cc9d2066519b6535373fc263ae49bb96552bd9e6c01d9ec217d7ed3f3a41. 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/NL4AW2428402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209546e1783084df46b79198be7195ec99d95c687e177395a3286364bf2bb84a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL4AW2427902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38d09ba8be242cf6356cc5856965870f4e7751fd03b743b8b299ee8f6cd6a51. 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/NL4AW2327502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0251058825ec50bfc7ca5d55c226610fb49ee9b4d6683e46d9997443a7cbdd. 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/NL4AW2327308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9968cc82d95c950731275907dafff8eca83dc6dc6f00adfa3e81d7edb01bfa97. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL4AW2532602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58eaaffc96528c9f3627ce81688b1fc3eae1a5cf35db120f8771e846b9e99157. 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/NL4AW2537502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaf07431ef42ad99db2014a9d0240783c791ca3946060ca307d621ea3d8ddb4. 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/NL4AW2537602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738f0d7d1bde2f9d11442de8a935c35c45b83f2b8b746f6e08cc3e5244c9287b. 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/NL4AW2537702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417da4f4c946458c4f78fd727f28586084c378b1125a7eac074f2443673386e0. 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/NL4AW2537802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de185b7df414dc87aec2de8e1f4457dfaef48140f7084f71e35bb758f3dc011. 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/NL4AW2537902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0c04164877aeacea5fe89aae8a4e6417ef2c7faa044b49574afc4d1703cd00. 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/NL4AW2538002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c867f46454feed7824427d6d2b1ad0a833a93222a1cf99931d9e2bebea85628. 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/NL4AW2538102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0c04164877aeacea5fe89aae8a4e6417ef2c7faa044b49574afc4d1703cd00. 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/NL4AW2538002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c867f46454feed7824427d6d2b1ad0a833a93222a1cf99931d9e2bebea85628. 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/NL4AW2538102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de185b7df414dc87aec2de8e1f4457dfaef48140f7084f71e35bb758f3dc011. 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/NL4AW2537902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417da4f4c946458c4f78fd727f28586084c378b1125a7eac074f2443673386e0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL4AW2537802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738f0d7d1bde2f9d11442de8a935c35c45b83f2b8b746f6e08cc3e5244c9287b. 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/NL4AW2537702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaf07431ef42ad99db2014a9d0240783c791ca3946060ca307d621ea3d8ddb4. 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/NL4AW2537602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4f6a4f10990d885a3d2d72b386eb229fb046066ca21a074564feba53f899ee. 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/GBKQU2547828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fe7497614e7f4c81be571e60d9a77cb899321abb36220238e9e7e6e33f7cc4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL4AW2534102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274d5d638509d69fe8087752cd18ee2063f27d86a6597224a5ed9abc3337f817. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL4AW2533302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1acf4adc549cadebf2e78f51a0b06b1b0fc57072937c696bfa34ed042e69d4. 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/NL4AW2533304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdc8a15db4f78373aa2eaa05f519ec18de03bfc3764d52d8bdfe56f4a95fc1e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL4AW2432002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38dc5554734d6a683328c8a81c7d6ccceec3e1f1f3e64d579bb67d9fb838bdb. 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/NL4AW2431602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89f38ff44e70ee1f0cde18dde154eb1ce1c679a9b656b96c7c50dbc59cdf790. 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/NL1S62400791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x281fb68a4ea2085eb4fc422101d4c2de62bd43a4d303e76aa0d1cf54833b9ce8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAJK2540368.