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 0x573c10c15e2d003c8dba3f2c1379e7fd0e8fb658926fff300d91dae6f6f2aa28. 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/5e3435e5-2a9d-4857-a74e-591b06b4e863.json and https://artists.proofprofile.net/proofs/artist/5e3435e5-2a9d-4857-a74e-591b06b4e863.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 0x764462a95b1c9d7adc2c25cc0cdb066a8ecd6d49e592bd28f2d3467e47361d72. 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/USCGH1448690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147598c59de99197c8129985c2224bc1ac94fa98b5cd96376d0d04ff6ceda5ea. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USCGH1448691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbc91d9f5576b606c0c3c7831d4c7f28d8e190457c7b51401353cce6687666e. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USCGH1448692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9655f724bc938f29150bd0f05371b7f98fb83b95f1cfdf45e9d09c986eabf4d4. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/USCGH1448693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fdda4d2192b2782e6513697e3c4285e20cc12622ed523b0e2a6726e9321663. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGH1736167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8971b1d6c7b7ec1ea1e2c88693cfa9e6ac6ed70de58f7f546597d187b079e62a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGH1736169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d6f707be83e4be7baed1877ae4d57adadc489fe51e5c335911e4709c50dc0b. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USCGH1736170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac75a52579d69cd9de449d0e198588a4262293665553b7f2200059f66a0bf5f5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USCGH1736175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc779ccc8f0982b5668282222fa72ca5c8f4c0b3bcc685359f001fdea6809b1b0. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/USCGH1736180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239fd25d3f318508dc097947d1ac2ef9c0d824bad9220d005c032c921aa4a762. 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/USHM91975510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb568b43227d7d7a1bb8a73f7dd36a40296870b033bd0f9e484e4a208909716ba. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/USHM91975511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38a676234a4f3b736c48c567d6da53fec77e5179915b5e7841ab6a177c51feb. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USHM91975512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3769e2d29df667e8e68ed5676eafc7eacb1a29cf850d42d65f900d2b5c30d80b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USHM91975513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6d7e71056e585c7208f9144fbdd338662f870f96051b0f29aaaefd47b78903. 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/USHM91975514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682205c0b515d5cc4997e81b129882c6406bdfa6abc0f551d10e9db4cf264d42. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USHM91975515.