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 0x7a3c9fb297416043984b634658d05c8fb57aca18d016d10ca1e100edc2aec3e3. 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/e700cae3-132e-49c9-bb49-2172db922a06.json and https://artists.proofprofile.net/proofs/artist/e700cae3-132e-49c9-bb49-2172db922a06.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 0x6f772180d27b22f07b91242bd0eaafaf2e06f57ca61405efd4d9d825563f5506. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZWFJ2550785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e68f6673067b946848333ac1e5b09ccba5c74ec0d2fa66871ef50e8da102f1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFK2575040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd5d0bb482d6e7fc63300ef12678cefe14cbfd51f27f1dcc848f4b2743628e8. 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/QZWFK2564564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33f47b5fd81cef65cb38943f039305abc68973999e6fad3a1436dafe7462acb. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWFK2581575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a5632772d91f0d9d654054c2a8570bac0fa98eee408dec7a11de9c61af15ea. 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/QZZ7Q2543698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c33755b90fa54a455fc456339db01fa26e7e50c2e376f66dbf907b240fa7ec4. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZZ7Q2543515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471680a5c2f2c809d8a03ce101a7301cdd869b4589cc0321616731c274edf100. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7Q2543565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbbceb9a049ef5c763872266980044ee49eede4eb1c20d186ac128a5cf63895. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ7Q2543739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94760fe9fe412e868cc5d18e3e4582a7447044cc9e83aa4911ce5b06f45d09a0. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZZ7Q2543610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5435b9d3299723188fb3e9aa6f78dc9134026d582a9667f826c14d4f9374ec. 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/QZZ7Q2540814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3f569f9b780e98ee4fc5208591999cf1003bc8f238babe285b366906b08996. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7Q2546236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dab58beac01fca9496b9424b45151b968260318a51012c7a1721570d50dddc. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ7Q2511155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1f0f18320ddd3187ecad799a2e09cebfad01b479c0dce751aff8932860b67c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ7Q2553233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf668c7cb4b45c9daa46d0077662fd3a9635c32ddbeb5918ed3aa0df1acff4408. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7R2582572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1234629c31852fdd6390eb3e635ab18044da51fcab8e1ae1ff2602f8ca51403. 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/QZZ7R2582545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910110c812711f4f626f5519a91ea1e6fa07e326e2537ef9080da41e5b0c40ec. 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/QZZ7R2589700.