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 0xf38399424783d2902a249abe679956b60aa71a6fdbcab7739e119bff1e06a59a. 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/a7b216a9-b7d8-40c1-b82f-2c5909ad35fc.json and https://artists.proofprofile.net/proofs/artist/a7b216a9-b7d8-40c1-b82f-2c5909ad35fc.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 0xe61d1a944a3eb98d4d9905591133781c15a724efc1421db4df6106f9368a1a20. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZEKE2085677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8892a7a00e2574a722544844dcbbb07f89af48c14bb8b0c1b6673b27a960f28. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZEKE2085678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a2ee28cf788ced648987b210e046e18826e1ef5d36439afca90eec3a74d9c3. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZEKE2085679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc689805a29353bca4f3ea300d12bffc4e02cc85c68753f238324cbd2411c610. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZEKE2085680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e9908eb3e186fdc15e60c02d2dc7f1f4940d99decf6e7c5dee2ed10f53ca4e. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZEKE2085676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61d1a944a3eb98d4d9905591133781c15a724efc1421db4df6106f9368a1a20. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZEKE2085677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a2ee28cf788ced648987b210e046e18826e1ef5d36439afca90eec3a74d9c3. 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/QZEKE2085679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2ed3e05982f759b72cc5cd92533c75a304c94c38abecd722a9e66893969a9f. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZEKE2085681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3feedb26d7b7cb315430509184097d3a47af2be4fdd7a949665227ae985849. 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/KRMIM2256767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45cc5f5081daa41c79b003d9cf7dd5dd272f5c555900bf9402213f915fc9e54. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/KRNAR2207822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442a472df2528c3a5e7dcc2e175dbf4ba3586d683a82f7986c912667b8a6227c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/KRNAR2319134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fa5c23b64440842a7461eef6accd3d2ac91fbc03fe3fb0ef1b7daef19f7dea. 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/KRMIM2426665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cf6a92a934ef8256bb350b64bce88dc3dcf9c97e507891f5140375224752e9. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QMFMF2442818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df41434eeead37f559a2e6ed370a64c6cfa139de3ce84852cf912c90124ad22. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QMFMF2442940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2748d11116ce442200f89db81c588c007b7e5a02bcf3945b356e4ec98dde736e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/KRMIM2502321.