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 0x96de7dea6f2fa915fba59555860d1d5878945bc17c12968f5cc9e3c9ebc7f408. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a79abcb4-efe2-4446-a667-8fecc83471c0.json and https://artists.proofprofile.net/proofs/artist/a79abcb4-efe2-4446-a667-8fecc83471c0.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 0xfdfe48673fa1f5ad9fd28c8414a72eeef3c1f6f3ceaf9bfff84d682c09e7146e. 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/QMEU32092546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f429923479fa6e5398237151fa7cbb4c6eeb5befb4761fec881424e43257e38. 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/QMEU32416768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc301923943b91a7524c22887f45d4e9c96ad30193420860c22763d141a15ed56. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QMEU32501135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7284cbe929c29530e08f3540e9096e8e16642fe45c683009e57883c749bc582e. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QMEU32504127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6353ba0f35e9a051e35f68da629656b52aee6decd1ad686b88930586333ecf64. 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/QMEU32504128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde88d130a85eb3751b97cf2e6496184f4dce34c0ed3a74cbb7e1e9d0dea80b1a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMEU32504129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9a7166313d11973721bb6c56a1b1b79044d6b11c3c87c968361548e061fb54. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QMEU32504130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25e6ae679f702e1a9c432fdd1e464ef72e1bd0bfc09b66bdc6ba66332cd5aa0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMEU32504131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2099b6a071b139dd4ba14e99b467ca64e845affbc4a8ec5e831cf88b99cd323. 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/QMEU32504132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e22d0853b3dd8ec05bc85353ca8c55a3f36021afebffcc6b6da2d988b65bd0d. 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/QMEU32504133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c504b2c57fd2b3c51d6a7eae0b351b6973671c2ef02c491978ef5b92144bd9. 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/QMEU32504134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ce3c2c47d9378f832d9cc41a8934eb042e494ba2ec10b228c84bf86777761c. 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/QMEU32504135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d8564c3a019bdce6ed5d077037d8aba8d39f22aabe26a5dae89b689a17f81e. 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/QMEU32504136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce8ef86bc587967132ab4f69f3bf0371b501b3c31f80c661724b674d626a3fb. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QMEU32510738.