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 0xa2bfac19db5fd9e54a634200c90a83d42682c233d8a561cf404c3a8e26bc8ec6. 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/cda36951-c44c-41c6-9e02-ccf4ba6f2c51.json and https://artists.proofprofile.net/proofs/artist/cda36951-c44c-41c6-9e02-ccf4ba6f2c51.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 0xfe59319062ea64bca28216eb079b40b6315c1c98abcc2f24449ecc3ea255a56b. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/AUBEC2042450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1d94029d7fbc985c43d20e3820e91e7284d0887c360d5ab8f5d351be1369e1. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:08:05Z), 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/AUBEC2042561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a0e68ce866be136911cc20387f2cccf96cd5b65b9721eaf051075bd4e4fc02. 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/AUBEC2058902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333fa5acef8455bb3190c7a1ef5d7dca700c00e8067b0bbcc440ae1589d8ecbc. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/AUBEC2083959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739282aa52c77b3bf44c60a979db64e6ae797536e4e338ed7af236f1ab9f1925. 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/QZMEM2131960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f0b7695d73eaa4a1d57175769ec1726cb61d5a5cfaace6bc2ef85ac236cc55. 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/QZNWS2152430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7b630770cb0593ff093b9ddba3e4a17f6eadf1543617c7a676d2d39127bdcc. 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/QZNWQ2287481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6d67ea824f5cbd2d20085564115e54ec92365d6f8100c3810a4f8c451fba3a. 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/QZTAU2342948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ebfe9f1874aef0190dedfc730c6354c7a133483f04b50e273d062b010faead. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:41:14Z), 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/QZWFL2394473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36eac74126ce50e2b56626e46562bc4a8140a296fe06d6ca3caaad3cd193ec4. 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/QZWFS2328810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a81e2892f547c303c6aced4bba34ce5c86b37cfd7913a6199efa5822efc316. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:44:28Z), 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/QZRP42439697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf94aca2e512084adbe5fdcdcab3837e0faadfb0c6916afac83959b131c2e5a5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFP2447170.