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 0x833d631b5315caabbe5ab201c876435b4059d01fc2689d258ce60e0937240ecb. 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/0131f429-c966-434f-af23-ce35da7c6510.json and https://artists.proofprofile.net/proofs/artist/0131f429-c966-434f-af23-ce35da7c6510.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 0x14824c13984cc27d82b4749ca8116f4b04785b8c7d949e1b91865b17704ebe6f. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QT3F22464659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0287944d5bd1dba1f03a2b3cce10482601baaa326e7130d906f8df3f486ff7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QT3F22464664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ade56a857f1c196ca201fb34aa22c65e9ed6aa7382b16d7534ceed9a317021. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QT3F32437433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324a310881616afd688a9a95218d6cf528cc708e0f914317d51a42632d06aafb. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QT3F32437434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2946bf37957e2177f24c6dea2246775e3854b1b02a9bf9e85fc94dff9e0658b2. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QT3F22464627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe770ca6a06d5f530fd245ad45ca9e71b53de6c717a875d38e26689d58a9e12ab. 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/QT3F22464630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e0e3c52bb5c679e2d7a987fbf25b272d869fdf179f00599afdd8d176e5a572. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QT3F22464635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1ab3a55d5a613536d7c3bcf60215c524439517d5e9ae06fdb3b7f773ef3833. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QT3F22459929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f67cd703bc85b87ae170e36d72c87068f6a1e9bfff69dbf0acf2f9023147b57. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QT3F22464568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de9f86c967234b72c8ba601cec10b7776af39d9b320b2fab362480e7252cec4. 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/QT3F22464571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415ee1a87c8b00116f63beb7144082471f9f22630a427060449f9e7f41d69394. 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/QT3F22464572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18fa067265479b77bd2d7c3befc936fce992082f50647c3d63b6b03bed7e3f1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QT3EY2499017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ebfda2c903511d7e8e927f7a9185c692446bb3b1754414c657a0ec853dc329. 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/QT3EY2499025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f5a50d7f846c68a64db3a749e8b7bb9bb35e2f14595db2ab4f5159e6011fa8. 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/QT3F22412263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d905041775edfa97fdc10534c0291a7116b23e180326d0064f2bf31eee28f76. 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/QT3F22412271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc246b59a7d0f55953aa638fbe55b15827845ad26ba434c3e14e60841fc2c1d8f. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QT3F32444552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbb8e948f4056097b6919d56e3f5925e186f7290b9ea45f349d6d483e7a4ad5. 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/QT3F32444554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd92185dfaf616d585f6f5cac9d037d37528dca9f24cdbb5583195cf26b6e9f. 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/QZDA62536137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c78a34237b31563920dad02e109f2976db49c6b226d92d4413cccc052af164d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHN92579412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4144c3e1d7b987970e13dec8b2518eff16d3d5a85e3d5ce860daa19428f1f8d6. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHN92579413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb054186fa56a95aded0312e6a3c4b4be99665ecb25f6178cdd8852042afb8bf8. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZHN92579414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac3106717d236571532d7eede7bbd855794b41375c22575dd9df129008dd292. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZHN92579415.