thumb|upright=1.35|alt=Three running men carrying papers with the labels "Humbug News", "Fake News", and "Cheap Sensation".|Reporters with various forms of "fake news" from an 1894 illustration by Fre
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 0xc99e0216a13e548e7dc48c2b29e6a1dce8a36b5cd22964f35e943efcbaa033e4. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97d8cb50-0df3-4ae6-9122-7224661aaffe.json and https://artists.proofprofile.net/proofs/artist/97d8cb50-0df3-4ae6-9122-7224661aaffe.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 0x34fe0015974c083d60b7e659c3572e4bdec50e42eaaa9dfa760a7bc03967a9ce. 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/QZHN92140987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6c76d5cd71cee74cc2e1c89ad3e46294a8d7a72cbced131894b8043063fa93. 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/QZHN92177918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c182287874582572410629f5be0bf3c5ce439668a3aa0539e257f82a8bf76a. 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/QZHN92177919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8dfd88abfb323db98aa8955fdab980e5179dd313408d90aaa8a4f387e734688. 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/QZHN92177920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf6cd4f5aed37a06e9f60263dec2ee8d46e792d50bd34c24ccf6b3433804f8c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN92177922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1645637d66256f3b739016970e11d1abf3130846041fd46ec35e2b8c92b4c2. 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/QZHN92177925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9092013267016977fd48d3b39505580dde2e293d60badeb45aa267179d84d9. 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/QZHN92177927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9cdd05c37d53d6d722a25952be9f5547dcb091dae62ef60ffb329668def028. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZTB72281170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f03b37825386fcb059b484a9df5e3ddcf78dcac085d3e59d45ce32d596c85d. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZES62495878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb60de20aaacc8a4948354e599ee184f368ccf4c7f2794b8fc3e12951b5098b2. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZES72452392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26fcc6889acda811c0a7978a32765b698f5e26323feb85f9c722b425d363c58. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZES72452393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1707e42811731fa9e2f9f955776282e3a8e5b88a9098e812fa6b1b433e8bc78. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZES72452395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5486e03cac13588e587c66f2004e7ceca2baf0f25e5768fb53019bda20e201. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFP2422382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8277631dfa6038a224e3defd91debb7427f7bfc7df48f15cc1cba8eae4f76960. 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/QZDA72573413.