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 0xbb0248d681b8dca2f8c7549d6698cf4d4db9278c80094f34af83222c23e6f603. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69c80284-4ada-4755-b626-3c3b707f245f.json and https://artists.proofprofile.net/proofs/artist/69c80284-4ada-4755-b626-3c3b707f245f.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 0x230624a6b6d4f8d9dbedfd12f94f149fe33b9c3bf8a017a4f68e7a2afe029542. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZWFL2334773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31da871639c6816cde54e4b93a97c3572fa9f7417be203a66345a5b2a5fbcdd. 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/QZWFL2334775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c874820a6278c7f202fe75dcce969a9916ef9b187cedcfb416270d2bce0db3. 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/QZHNA2550135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843003579d3fd9a1e75b813321c130c823c4422a35d5224ba6bc0e04bd6943cb. 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/QZHN92581011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46dce6c48e1810547735cd727640c63dfcb378e63ba49e28a2aac74260ba51c5. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZK6Q2519242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe650c03e60277f4ba49a21f130bc3b4dc9d555d49d8727603a3d02eb637d55c9. 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/QZK6Q2519243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dea119a1e4c13e61653b9d62ec86de43c61c7873a3212dd01775ffe4be8e8f2. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZK6Q2519244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffaf007bd61cc7f993d3f380a9e83e146d36d80a2deb4880c9690b8a7fd9545d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZK6Q2519245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70bd4e3ef4b706a7954b5243c5ee0eb10c545a4b859cc24591d69a244d830a1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNWW2433216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca5d4b1ada6ff0ce72ff71e70eaf4eda0da1a3dd86a99304f3545c60e4d62b7. 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/QZK6Q2519246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29717dd70fe41b1d36ac6308d5882b949c27a90b927b3f2dc2ea9435ab09eaff. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZK6Q2519247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aba9b6dc89bd9ddbd1803a77ef7e094f92470c1bdf5a6566d27c789fa844d78. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTB42538961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2fed19f30c31009dbf1c972b12fd05ccc8fcb3f62311d864caefdec5d9fdc6. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZWFL2513854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1df90d4e7d8b4afa76b145a2aeeea50c006690a6c85c6e774a5c0439473cea. 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/QZWFS2551957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd7627995e23153b476703bbcfbcd5618d273a063c5909e38350ebdf263ad55. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3F62561572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7c702df89179d0a5a19a6f3d61a07c882f7633b2380270af8bb588971d4b36. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3F62561573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a970300211d84deeb57627cbd1f2ffc5fe949ef12d6c3502a7cdd6d41b6d57d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT3F62561574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124594465824c48ae35b7c3142b9bc8357bad5ce5b51639eefac2a28fa31c4eb. 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/QT3F62561577.