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 0xd4a936028c7403aad705e2b493ee9ff6e9927d0830470276a80fcf9480e7e00b. 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/f5f1051a-c988-4757-8ed7-cd50060b43e9.json and https://artists.proofprofile.net/proofs/artist/f5f1051a-c988-4757-8ed7-cd50060b43e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x63659f036512f92013faae5329a26eb8e72e5f0c74e8573f0bae7feda9aab1ce. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QZP7F2301077.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce9d2019ee89c9160449b3cd40f7e7242792ff0705c48d39189d768b27b9462. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZP7F2320234.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36877cda653d7eda1119f8dfd0f426021ffe7e9bfd1ed9c6d9f0886ac14fca7. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZP7F2320194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd0f67c2172371441b6ad6f5adce616a14541d657172234eea93c7a1f79b4ab. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZP7F2320205.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee05b7420a90103df37def35b182816dac5136eff75a2ef546cb83d6c3f4c89. 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/QZP7F2320210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3ed236bbc733b6d29f12e9e285ceff82bfaebcd741c8fc66862185ef009f57. 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/QZP7F2320211.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11720d286f6d1f7c1362ac906e56076d1bdcf0b392ff2f54055c6b8c3e6315ed. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZP7F2320178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181b8460e79cc555108a42a9dcc2dcf2a39b344767d2bfde273273c3fd01e0bf. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZP7F2320183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef4c4b01d05915478e02fe7b8c277cc5c53e1e17b8c555a50c1f8e50fb5e3d3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZP7F2320184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35c9f383aaa4a3f9eea35844ac76f33f86c522d23917557f5b4a8524283d4d2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZP7F2320186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1c4ca18473f267e91f7c8bd2db62c3cb92de23f3aed60f404cdf7a29a1af20. 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/QZP7F2320187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b59d241b5af9d5b313dce466287050e6f021f32f4f7b12602213a35491eaa44. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZP7F2320190.
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