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 0x45b4d47136bf847d0ca26f685b253a6883e6732ae97f8af3751050b5c02bffdc. 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/f5a1c1e6-0da4-4dc1-8fff-3d230bdd474f.json and https://artists.proofprofile.net/proofs/artist/f5a1c1e6-0da4-4dc1-8fff-3d230bdd474f.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 0x0a9331738b2f7e7d07817abc8f18736e8e257e2aee4c54289bc505ab18bae771. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZNJX2006860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cc2752ff83a460c3576c923d732d7d641a6a829c7311ea71ec3835134fea3f. 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/TCAEW2092551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2158987e4c9d865e00736efdba218d5594780fa852b30478a2e0b3e4e2ccdf50. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZTPX2187336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ed76e21b9e3f1c386e3116ac7e534cd3d7accfdaa0a92d2af302105485e10e. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHZ32125989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590389ce1126eb5fb850edb11fff6bea47b00ec6f83dbfb039869fef82fb3cc1. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZNJZ2165128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792cd20360485840180bbc062f7eef9b272448cecea63f02eddf8d57a719b21f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNJW2361080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19686e0f4587eb78c2d53b1e954ea01e54e3ebea90aefd44d89f3051890800b5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9K2384731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf281154db57a259de150162e4428d0ce560fd8cdc8a24919ce84176f0af31d2d. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZGLS2402746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452f18bd1616db638439b4e14565a49e9d7da5f0c2247f7db2f946c727257c13. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/AMA0H2400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb1a0c6b5cd3d8535d9db42f98375a8b837b59b86c8a9a0b7e59cefc12c1db4. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZTVM2392170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0a4509359d4c75d128e00899e78c026a5c36daeaeefc3c6d4f09fb0089efb2. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/AMA0H2400131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c839ec93b4ed4c2774729197d48f7e930517f9a944c5409648973fabc16df6c. 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/AMA0H2400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fadd2902ee8ff54d01df5ad077ead24e49227d581e1bb036d7f48e2ba6872c. 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/AMA0H2400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97e51d71ca69586a071020d8eb5744d68c7099da4f768ffc45f11237bf5b31b. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/AMA0H2400391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888c43f12b89c25099ff807ab13a63ccc4bf9c3e88c7b898885d8306900f0f87. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/AMA0H2400735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873f93c940dacbae015a785550ad9e4922b4ab4334f41fc14bf97c79b26633c1. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/AMA0H2400736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb27b0c612f62716935631d35a6283971df4c99c8916be617cafe5778621937. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/AMA0H2400737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63cc99d5e92dbe90274dabdddc52a7095ddd6d1f958a624f2d3825e7b0a420e. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/AMA0H2501906.