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 0x6c12d7c9531848025049193a05eac7fa35639e03a7415ac40f2c988166fdd847. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48aac845-f20b-408d-bea5-dec1918fe37c.json and https://artists.proofprofile.net/proofs/artist/48aac845-f20b-408d-bea5-dec1918fe37c.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 0xc7dab0bc5176e2a3e3db4b76421739971ea6b3b48a6ed2ebfbc578b2da4aa46e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCADX1874712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999b672ea91c0418ee6b49837c0fbd25678407dac69418dedbc9531e44417ed9. 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/QM24S1924197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608bc8afbb2404314b00c196cd5d9d2e5df3169dc9b6b65213f5e9f183c9824a. 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/QM24S1924198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c400632c2844f0cbcab36a49adfa874151aed276e8aa744de41562007ac076d. 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/TCAEL1986226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbccbeb488ac5a6342811d76e6a45fe2e92f1ae575ceb07a33ea210dd8dcb940d. 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/TCAEL1986741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ccf2be13a9591b4b6b4e247631c7dad6eb8caae0dd9d24f298126298abc6fae. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMEV2094149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903bbf564d844c3fdb9372f3adf1fe9c5bad24f7bdec5f5349e31d23cff3c571. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNB82074191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619632040379f1de7041d6d528185a3adc9ca09f06c96ac9fac06ad3d62a1807. 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/QZNMY2127077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451803dbef062b34e0b67f347b98e5dd53c8c9828302e5ff541240f0451467a1. 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/QZNMY2127081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0276b72ea2eb0b886a15cc75a8f8f1cde8773a17a461133be2299135d9d30466. 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/QZNMY2127084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc259d8bd8a234fe45e85c712bf5f91890b7480561d3b1829afb94bea0c4b2908. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QZLL92370686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee88a76a7ceabd870070c9484f642d7d60e5a6a3d0d0bf296f79521bda7f516e. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZLL92370687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c1f8fd8f181ac75485e693ee17b039a82348b32128c9d406adabe5107c65fd. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZMWW2399083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd10f735dbd50fc039ba08394f654351814850f43ee3b2081ae16e2c1461a37ca. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIH2445839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283e29c24e163db33abec9a141531a7c803ef693f6d46bc9e0f01f7a0ad6e2c6. 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/QZNMZ2458377.