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 0x2462434b98f0d4b68022ddbcbdb87ee461c277a490b388b6751b1c93d830ab74. 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/5e0147ee-6613-4dfe-8c0a-4acde4430889.json and https://artists.proofprofile.net/proofs/artist/5e0147ee-6613-4dfe-8c0a-4acde4430889.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 0xb498b59a564b8e5c4d4bf21069ba78b5653cd197d3b0ab3fd1e5b5feb8dfabb8. 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/USJ3V2377109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb11a90ea472d04bc33ccc67b0176111bed89fd806a6c8d9397fec76b7a0e650. 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/TCAGD2266180.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d967201a1b7410ec864aa6c7e760c72d30dd29f5aef6b82fb520c24d50d4b2f. 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/USJ3V2101622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28108fb68b080f837b422bd17c580fae3c3d1e5d325b7180f2f8fe6a9da534f9. 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/TCAGR2282872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405e7ab78822168fd0f82b17bee4c7e960f1f4de31e21c207a9fd0a3c451a69d. 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/TCADX1808211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a3c716b9574e604cc79beb2a399b06d2cefeed5845b9332485544ddb40b003. 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/TCADX1808238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901059896a941287a274689cb9b34f68627210302b4e06a69a6b9d47bd1f2298. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/TCADX1808242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1243ade8c193d8fc3f9904e595bed6c41a1a1ea612070a3db56bc453e84348e5. 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/TCAHI2355977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7936545b4c47bade41aa9c7988c471400c837c18c5d23a08fc0736c08f1a82da. 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/TCAGN2211220.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0dc51fd9754674f6b99562d759d571da1e0edbc7fb39138f9f416643e3e008. 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/TCAGJ2297125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02c73ddace1fe16b764c5d5b8960c9e9ec4211ac788ee9244dfcdcbd5a08c4f. 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/TCAGG2249325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1727951815659a45bec7db59787089cbc3be732069622f9b9c0ba5e02a36e71b. 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/TCAFX2152603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f6b895c54766ce5e4eee2651c4a7bcb779e0f508397ba12e02c41ee19d101a. 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/TCAFQ2124309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9bddf0a340f9502383ebdaf036cc5485ad9deeb2834d1454ab640400779893. 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/TCAFM2197716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca8bc85197983c532371f016b72d7f19df912b9b42162325d67175c64e1ad92. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAFI2034761.