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 0x57c9f8947d3ad537f3efc62574e6a5e251fe1ed2a3a82c72abd50d394a8acf33. 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/2eb09535-2ff3-431f-85c8-548ad6ca63fb.json and https://artists.proofprofile.net/proofs/artist/2eb09535-2ff3-431f-85c8-548ad6ca63fb.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 0x82332314c2b4941b02a778540f7b72ca235aa037ef29d0be7b00cdb74678909f. 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/QZWFF2390979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0cd91093d7dafd14ab095cca83b5522a82240d20ee4b6604aed3e39342683b. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZWFP2392089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa865f0d1a525640eca860b3d138389e3f66bc4ee4013577accba5b17b7f50c77. 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/QZFYX2445780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4856ae8bb8e01af8d707475f9b3a50e1793707da9793822384ffca2336a602e6. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZDA42467385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7fe3395bffba12c558f273379ab76b36caa77b3e6358f8ec05fb2ccfedd313. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/ITUSQ2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7da789db3bbe2157bf5b27df6ab4409aa918bf0805f127f877146eb9e6588f4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ITUSQ2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2034e95984e74bb6aa04c28f3a2d2acc9a5749986e97ff65415ac33420f1faac. 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/ITUSQ2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cc5893bad671a652c2e5b66532225abf48764513859345548409fa90bf8ac6. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6J2481671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe67411491e94ee0b3242ceb08cff1ca59b628a9404ab5e91427692e4f0dac6. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/ITUSQ2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c50132691bd609a22d4dd58500b6448fbaa01d484d20cfe2fc82e67f08a2535. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZNWW2421208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84d833d9b2112f1c326eec08f1a64303377e282ee2ffaa8fe9cd91e51d67f0b. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ITUSQ2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5e16f95201e3d55f0f1ef13b6e444faa4b137a7ead6be5edc241c2e072f8c7. 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/ITUSQ2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c5245f9d3c30f59f5d199773d317e0f5357cffbd3ddab3f372b79452eddefa. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZTBA2440191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a796bebe2ce14743587e2810f7620cff7e6ee075101fe2dcde767aafda6a40. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ITUSQ2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a840bc87126dcc9ffaff14c1fbb80c5cc3740ce5cdd1704459820e2d7e6f310. 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/ITUSQ2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0393b99a43550ec9e5f0f64c2c0e16595a72c482232e17146ddaa9c108ea7f5c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ITUSQ2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0747f364cf0d7c61b9b862c67b514e813a12ddfcbdbd4a71153cc276ab5ce51. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ITUSQ2500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a2f0bee1f70c0db36592fce64e683d3484b99aeb0c21b5c0d9e4ebb7c59f6b. 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/ITUSQ2500029.