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 0x3bd10f3e22ab8e639c6d95b50c4f14423835d283deb9889aa7259e931bd9e02a. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6ff1146-9cc4-425c-a7f3-66ec8c689c5f.json and https://artists.proofprofile.net/proofs/artist/d6ff1146-9cc4-425c-a7f3-66ec8c689c5f.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 0xcebef3af86f62792bfc382d8e993b632acc7fc3ad0cc36d81156746be4ae246e. 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/CZE561310601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88608419ce4fed1d4b143211313142205aa0ed089892f0c4ff6f8e1a4a00ef2d. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/CZE561310611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0f5e566a380ca074818623c8971e089720c52e1729825468e72b5fc1501264. 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/CZE561310614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe36b7caac09213e605f3103e72e9172b46206292af2578b7059bfdcedb5cd87. 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/CZE561402501.
Zamilované Duety (Mára a Marcell Zmožek)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b711c805dcf74d261df5698ccb445deee739c28f601717bc084ee8a83fa5db. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/CZE561500501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aad94ba37445f6d1d3ea8a39a357d1dc87b3826a0b6c820b3bfff9b328f0b2e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CZE561500503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35a43811321faac554f301d0f90d52674fc96661a96b1ddce4cef8a8eb12031. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CZE561500504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738b0228950219972454c8a4258a01b6fbc6e9bbf5682a495059a892e25e5dc5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CZE561500505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd087779584cf0fec2e53f3b4f19abee600d115249e6d9935e9e14f2d399d0eae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CZE561500506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bf0c150fa39a8d3e1e0c3d4d1a1c4aa124dafca319ebfcd30240978679fa1a. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CZE561500507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62156e723b30bfc8db23e7f4b84e7f4469b5a606d08bb686b0918607baf9246. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CZE561500508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dc5e6e229785328394ede6fbbcf892ccc6bb9ba78a66a215203b77aeb00581. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CZE561500509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124586d492daa7cc6db07254c8b0605ca8855ebaea9e654161a44e358f503ae4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CZE561500510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5fd5d75c5ac41f1346f857c56c7dc5398fcdcaed583de32f8a680681f69a59. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CZE561500511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3caeb24cd067ed33df9ede7bed8137ea84fcc2424f713f8b84d8b9c48588f94. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CZE561500512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c07b549ae865198dbc0e0cf8b951711d8b230e52599297ff8bfbbb59451e590. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAES2092470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f74e76c621b93848aef74ed3fd92d699cce8b2c5db57ca931fd29dc11d305c. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/TCAES2092483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e439db2ad00496525288b30c1930c02bc8235bca0573013297cda42e5b660ab. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCAES2092491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9deeec5e5acc168b28247b3b4a8aa6dca24197841531e99fd03101998c285604. 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/TCAES2092495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a49067d95c269c7df687d075b859efb695034fd487383060a667f24f3155af7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CZA161340219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749ecab2d7df3c0e3d1b2b83d7f8ba16f659e5996f8059339be29785c154a9c5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CZA161101604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa057dddf419d0223ad586e9a783fff9296741d2314266c1597170e680e019726. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CZA163354200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fdbb651530c700f12f4ed056713dcd2cd12573f8a78287c4a153807ebb4943. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CZA163356101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be5277685c07a42fa3d5b14141b8e45a7d57e42f44ffc855f7af131900c04c6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CZA163356104.