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 0x77d5dbe2b38e7d0944f93e1157c894b3303686e4b06da905ea77f851af210898. 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/d2e8f9af-537e-4f57-a666-eb684f769af8.json and https://artists.proofprofile.net/proofs/artist/d2e8f9af-537e-4f57-a666-eb684f769af8.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 0x1426e8a2415daf8e322d100abc157293334a4be4893f66c2053f3e35e3b3616f. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/USCGH2127410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac87c2b45c93097ef1bd6d897043cdbd34a3ad1f797dd48433325b0c24ae70e. 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/USHM92104539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657b04323e8ad0645fff3b57ae6ad50d0fa63cbb78c350749d8f1af6b6cdf41c. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USHM22214445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b05c4026d624f6a459061e939dff11c0fc4c9cc0b3c9bda3b479500f3944f9. 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/USL4R2232878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5bdfceae66e486e1c2e628ad49be30f110b17b35d4e8955aa91941165c552b. 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/USCGH2303875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8c05f7e9f40b853cc1ae0466355a61fda81cd336b4005b42a6566a8577d480. 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/QZFZ72307514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cf7c9c8d5a845fbc93b308e6aa69cbd31d953f68b93d171a47aa423955238a. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZES72325120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb8d75720ff423d2f572d2d9bb38f6b79dada4d6f7b6f97e12976c97f461ab5. 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/QZK6Q2381944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bfe06da44fb84c96736b8e8a65f1d31e62562b19de5c68ddc526f9fbb152b6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWY2354710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeadb288c3930c3ffa051dd8de73ca26e1a0740afd29622c454cb71d0ae455508. 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/QZTAZ2313633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d5159cc68a7f1eea43f43bedd3f6cafc13e4d31f7d1f8618affc6ef1eb4f56. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZTB42330489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11642415c0f37ad5abd3055393c3c50d6fa75832b99ae95f85d9afd07d8ab332. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZWFF2343194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee9526ab682cd5ca3facd69ed0933f05d53ace9d3b471bf3e8cb49c9f8d59d2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFN2306094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009c1692fbabe6f61c212c0d2be591f52f7a6b705aca06280c4ff9fc35420f6b. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZHN62494155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6147b157fc7482581ffbf3a9148c79b35d560b1ff25a865a6b65a50bb1b1de6b. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZRP52496302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c7550ca016123d1e692ef0048784d87ae9e7487251241c8d9c058bbedc7a9f. 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/QZWFN2463316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edbd3b3f1986ff072f125cde5e8d867cb7a54d5fbd83cb83cc3f2c327edd08d. 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/QZZ7N2456084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef359d635a7ac9c397d99775f655f0395f0232dfbbf1c0a366879380f319301. 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/QZFYX2526208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160ac765420ecec3a05ceb5b0b96fcb908818e8260a1914a21487dd92b117cac. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZDA82591501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85726f856c4a8e23c981af6d0e8eb28818b850011dacfec86c5227b7848556d. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZK6J2546532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168dbbd1af7f1dccb07702914f7ad05f321e0230fff0a86e234f173869c1935b. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZMEM2548159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35900b67eb268f1831aa104117af8c245e591087c3d61c869bb2c06905cd278e. 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/QZWFR2525131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c92dab98d0ca624fcd02d73bd5f552274eac1d5e43d584bf5ce9408a318ecc1. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZNWZ2238289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276266dbaa60b3ad769201225fa06ec00924a5ae00ff07a801fc8313ccd9441f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ32392633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c92dab98d0ca624fcd02d73bd5f552274eac1d5e43d584bf5ce9408a318ecc1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWZ2238289.