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 0x8cfb1d533d61718767a101356a972fd57092c16916655d490dd6f2f355a2cbea. 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/925b585e-140e-40ce-ba39-628844a422ff.json and https://artists.proofprofile.net/proofs/artist/925b585e-140e-40ce-ba39-628844a422ff.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 0x3b63393fa73a45d0b58f2acf76b39a1cd3a2b3c791d1a7ea31bc1968de99b1be. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM4DW1767165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1d668e1890fe4f643aceafdf0072d91f83db5d7619230ec15d26e0fa5c1a1c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM4DW1767169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531db44b4e53f867ebaa41c6fed36f9c7b528004020f0b26e6bc1c723c554928. 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/QZCE61872052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1a12d77396e7f2ef89b0efdbaaebf9ac79acc89892223e2a1bdee3d44dfe29. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZ8LD1926095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978e410e11d61080a8097cfdb7e1051fd61eafbc1c387afe68d9cc2fc6ef4e1c. 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/QZHNC1930121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98886cde5788b28a62cc8598fbd53f8bb7181949442bd334c115905a1a0c6dad. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZDA72073704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10837dc47bd6edd19ce8582f05178c07a66a3983f95f064effa61a81da33ce5b. 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/QZNWW2037388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf383427d8a67476914bab03c1c56422336adca232c293b55618b1c0d54f02368. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZK6M2140592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6235b10bbbd9433b04b3338c52d099248b8ceecb459bd7c55e10284abdb256. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6M2140593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5dc6ed34711dfb4a444a8ade4cb5c51a39c634ea167e7c3fe0349b042fbf7d. 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/QZK6M2140594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de691ea21362c238e3f4e0da4f4ee7d16794a21844727923a286973c0630fc2. 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/QZFYZ2271159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b22245110fff601ce6e9d36b163a4e19608958dc366bc7dae50671d2da0715. 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/QZFYZ2271160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0edb9d31085bd4b0e4d395de19e844155aadd343d1c1702115e441c946e024a. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZFYZ2271164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532bfa5dfbffa948b7d8d71892cb43b904d98874f644597c720458106f3ae529. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZFYZ2271166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96607bc67f92f130a2481ed5ea51df71361f3485fa640b9adffa702a0510d155. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZK6P2202889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3fc91aac660a48e79d2166b52ac279eba5f074574c770a492fcd52cbaf57a8. 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/QZTAU2200192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0beeafe4aa22b1722706563dde383a0d8c7694f432d80e8517aec3da14756820. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFZ72304205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff443188ca4a0f2087ea1ea19f18353a871a1b1cf6e0f9f9b781888bb65f877. 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/QZK6J2369543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a909d8f5c458e7034b19d541e16bc09dfe57120fc3ac7e975fe13e6c88674e. 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/QZFZ32456439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52712df2b760a5c1bc927ff13781bcf0accbbab83b863e0de30bee2ba1c70a30. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZMEN2412194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc682887489cd9e35036bb9779fd51e1d67af713baf88e3352e3c22514e8ba7. 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/QZNWX2459071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276cfb828f762b5289bdb5759b171e3b4d335a1913514756e2f1eb129f7c491e. 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/QZTB32492836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a33b488a698a4ce0018d982e70417b995f67aabb6a00a35b78aeab53bd6d5d. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWFE2414336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c7f36dc282653061575fb1b7bb27e18da6c9c5ca2cddc35ace269bc7607cc2. 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/QZWFE2414337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbacb85c0ee3834530306c189622d93b84ab34a84e8edfecfa649baa5533fcd6a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFE2414338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd3740373da366806a27ceae13ebbad1204084a6b95c0b76acf67d832de6996. 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/QZWFE2414339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abc7b99ce6648df3d873008fad25d89cb9f645fcc2ac7109398ca1260d69a2f. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QT4K42592325.