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 0x358291aa30b674e782afc682cc4e270da9a83f6d42238d39687b2343cddb9093. 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/d6fd9bb0-c7ec-4099-bc9d-db11e7af41a1.json and https://artists.proofprofile.net/proofs/artist/d6fd9bb0-c7ec-4099-bc9d-db11e7af41a1.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 0x62b66fbb06886daae9f11ba03d360f0ac5feaade247e5dad106775c2df757668. 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/INN242424079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34279c271cf099e612c1b7f9a1c946d2737f204680314ddd90966840161b7ae3. 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/IND862405871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e14db316b812fa8044026648908e3d53be14ba2bf3fac3b5bf19c404293ccb0. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/INN242418774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f52fe06119434dd0374fba74243f1d89b9cdc1018b25dab44c3158bd174ee77. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INN242414822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb01d1bcaf61edee3d215f3b1f004e1573ebc5aa3b3041fe5c652df8f6135eee. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/IND862403814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457a3920f4e4b2129bacaaf985f2c84825406cfe0be8487a34db72d2e1afd1c9. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/INN242410166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4c9e8c8704a7e81cec26b8f85536b320ae8589de3c7a538c2d4f5240d3e7a4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/IND862403374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60a327bc3e7b942b41548e7984f3259d4f39a3f920af0cb4a4960ef034a07d6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/INN242409400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75f16db16aeadfe41c815b904150b46323f65ca4823474961558b9579c7759d. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/IND862403079.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe9023bbde9fb73fc08eb8a056135a46fc03539bd87e9781205d9261af17343. 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/INN242405974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afaf769051ab19b2b3af965290ef94df9bf492ad5fbc6f43fd20c2517f021bf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/INN242401972.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526df3ba7df0b715f16ae42a3238096d47420d3b6064f50fa909f671a30d49a2. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/INN242319007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1238ee38974c57bbf89604413ac704e994c129d8731b5f37f505a405cdaadde1. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/INN242316874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce4498bc524c6b7fdb6f692939ddef70f56cfeea74a736214248bd2eb08fcae. 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/INN242317721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8e59fe62d6d1d1787852b333bd221ab65fab4b1be8fa25a8127c312f227ae8. 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/INN242315959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821daa6f782e57107271a0fe817f94e685abe99e2871a6c49afceef0f7f76bcc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/INN242315502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3ccaee051f33c13a490a7c46ec4ad1287f41722dc1a0a0eae13be16027ac7b. 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/INB1Q2302675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9847b9ec065ef9c0a835fec34bb6d9acc4794dd86a6e7ef62eb4183a0de9342. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/INB1Q2302474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7eb3d86593d250f61e3d441065f7afb5f12ea372e3ea529e13d4a65d6a5dea3. 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/INN242307914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb468f6cdddf0bddba73a9f3b80e4373bab218eba367142fbcd86550d54bfa3. 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/INN242307663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e6b585d9d323a96d6c7dc3c239d447314b51fbff89a52a3a0769e17560a0a2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/INN242303842.