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 0x912a52b77d2bbbf6a7e6a8ddb80b16ad52d73c54d65f2eb53116e621dad66b49. 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/b1086bae-be11-49a4-b76b-5479d90e9f5c.json and https://artists.proofprofile.net/proofs/artist/b1086bae-be11-49a4-b76b-5479d90e9f5c.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 0x004c30f2defa786127d050cf39acd9d27c0f3d41ed914136f1d1fe495607ef5e. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/TCAIA2424878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aac820abceb5cb7aa8b3d1500c34b661fd5855df2eb1965dcc3650b437bea01. 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/QZKWA2321231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2660084497ff5c8f0affd3d9f89c00c08cabad619b3ef58f045ce45e2fdd72d7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZKWA2321233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd383b350c079a1867f774a5cea3480b964158aeeb1b75fb6e1b38b06849bcf31. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZKWA2321237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2061732a96a45ef77282a32851b682f2c2c3479529ce49188445bc094a20a560. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZKWA2321236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29f6a0be50379281f257b3e7b647d0b2c9e75e33f6d1d5d3aef65aee5825804. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/QZKWA2321239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df1216840e1e5e08b0fc8fbb681cc12d37bed63516ded1b94ee04c30c8f961f. 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/QZKWA2321235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e54d55de5966970ce07fb8d1a5b44cf8e37acb0483d9ea1388315bf255d1553. 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/QZKWA2321238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48d524de0e0233bb436ca31dea6dea9efff7855a3e6379b36930158d6e94562. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAJG2561803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f236ff4b0a7364a7f4093f7ac73a1e1e423fa2c2aa892cd994e4811b70c96e. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/DEAR42575423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf22cb86d498fb0f12af9090d3339c478a3cf5a957d572cbb488f7954f5bbe64. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEAR42575306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297e97b333704536c6f328a8f2d2f12d7c3a5a27d4df698e7021dcadd6d939f8. 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/DEAR42575219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cdc7e60e73c2ca29ee417680db211a004b7b9c607f75b6a102715de50da6da. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/DEAR42575194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924f616414395da55ac0753c69a80f86305770f714578fe36f60836eec3963ab. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/DEAR42575337.