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 0x780f62ae30eaa3d86896e8d5fb2d47dfc3ef033f375419b9933d2a32293312a5. 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/b1c63262-83b2-4e97-a2e0-f2e5a0ed0271.json and https://artists.proofprofile.net/proofs/artist/b1c63262-83b2-4e97-a2e0-f2e5a0ed0271.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 0x21a0c62eac005359f2efe1166bffaeda0e714fe112563e1ff5116664888f29be. 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/QZNWU2019484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4f613dca8807315e0ad703e5d7ca47f502cb4a76c3209543c5d697a211c830. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWU2019492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a1b8454a7a1a67b310480cbd58ce811a04dd9dbee61733a4fbdd62c5789e86. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZNWU2019494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20fe8a02b72c8694609c78e26b926eaffa0821fdd9f55f956b477f04a7c2f8d8. 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/ESA012188633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdca05de3367b88774f9ee3939b7f265458d79a54913bfad39a83a96b40e560d. 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/ESA012188635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9318340ff9241cea9fd46e22478805d52249f0989025d4f0406e39baf11a171. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/ESA012188636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9e82cc7e529063930d3aab4705920c9e2a25b3b4ff02daa8147f6383e838e9. 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/ESA012188639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd833f495d0e53a5eb9f8e04ebef407182d60bb08e4c035ee07fb44bd3527dfae. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USLZJ2169375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86f0087c6813862c4950b34f2ac6ef03ee43a47ad9a8f3cd010b299e0c39826. 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/USLZJ2169427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc753cbcb869e8578854c86e0b49b4e1080999726247854e8c3dcefb8bc5bece5. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USLZJ2169376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8c2053f9ff5b98cfeb0091c4e150b9c87bcb57dc605c1df36c9693ddb9c3cd. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/GBWUL2102246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93f946d5a8669c695bcf307678a81a42b5943d7d3b002a532542aa5dfc9cc1a. 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/QZTRX2123749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefbc0e330d2b37f9cff3f35d78ae53b34eb07aeb784cf5c97aac2b374a6f050. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTRX2123748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f157d2202e49d38dfb035c3231804791094e7c7f04c50d9d98e9b5fadf9293. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZ5FN2228712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77355938286f0604f7d24d6fa491116eb35a68ccc5896218f4bb8bf03e02459a. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QM6P42225005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdc6d21069c678acde69fd7c835c6074c05602f6b11e008eb23d61ad61cc3df. 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/QM6P42225012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70daff04787a086f766e1c9f0133cfa05655197140c389a649c1442a1449771d. 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/RUA1D2285567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c7228c8fab2c910d8cf7bd9bbb08fc4bbf6d2e6e3570ede3cc83b58a3c8fda. 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/QM4TW2370792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167435f106308242ae946e50c324d161c3f4dff469824691aba0e5729452b297. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM4TX2360487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdeda42805a2e9924d088c0988f73692529b13679ca62bf0d1856122972d48aa. 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/CA5KR2391273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d082050e0bf8f93dd3fe790c3d65545411ce3641b74aadc0fcf05227f792c9f. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/FRX872497548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae3fc646b24dc10bf5f874d6f3cc9433cb9db617b01b163e69d4564d7a8b852. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/DGA0T2455776.