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 0x23c113aed92c42bc855c386d28a15794b08f7a2667a13488f8944561e8aec8d3. 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/8bb94ce5-3546-4846-96e1-f0c493ebc58d.json and https://artists.proofprofile.net/proofs/artist/8bb94ce5-3546-4846-96e1-f0c493ebc58d.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 0x09fe2d541b672b9f44405116693cbd4878d62bb7ce7f5678cb74ceaf87ae7d48. 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/QZHN41982616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c3bd9f799e4ec7e0aa26f55dacc4636127da31749ddd15e07bd831235d63a0. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZHNA1936767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edbfbaff183a533a55ff5358a83d136fe93bc7ed05a9a02c7065b6d24b1857b. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6N1905651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c9aad2cbbed391c5731d245a8d85134ad5b5cae8012a9f52858ddda588c8e1. 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/QZFYZ2089011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f801f51f329daeb545a432bd8f49e976a06f01fb5ffeb0e993adfef480c901. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZFZ42005783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbe71ec2b0c99ef86b4969c8e9ebe8854eadc7b015cb32eb72a0c4b2343294e. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN62010934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14eb9447a5e2157c4847db1d9cb80497ba3d01fc38dae6abd631061033c2da5c. 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/QZDA42292268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584354cc08a178a0ba4d6037625c6082e64842d148d1c38ef34dd8654477c9b8. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZDA62203305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53714adaf98ba8eb814ad93f7062bd61a55a694475e35b61c0d79ea9901c114. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/QZNWQ2225601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84baa46f80a7d51d3f0e15d47602906b82dc7867eab96013199ee8bd6ebbe22a. 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/QZFYZ2398073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100953b3f7c6b759608489350afef2b3c6e71136a551245800fbdcf5d07678a4. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZHN92315230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47106d954a697d09820996456b0ad51c22a992bb6012f661ce239e3f6837b7e0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA72414471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a33d52068927bf47b25138bf2c092feee8489620f31dfc524c831a9b9774a95. 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/QZDA72415967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbaf138716d9242ac5158ed5d853835719a834c713100e74fedf67cc53dc8081. 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/QZNB82487940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfea56b6ffd8d76d234047b3c41fd2c81026521c539e320fec08ff5ee55e602d. 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/QZNMY2493042.