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 0x0379d2f2760650af044f68f2c3dea84225ac2aa3302063cfe4b922d04739da6a. 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/4c5e4cda-ff69-48e8-a0db-25c3db26c732.json and https://artists.proofprofile.net/proofs/artist/4c5e4cda-ff69-48e8-a0db-25c3db26c732.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 0x3115390df1da72e81e4495cea2739fcaf4007c6f11d06553934addf076496980. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/ZZOPM2002191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbd6ee1392c3fe85565c45316cbfcd95c8d1b38acaa608d3b72aa318d048ceb. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBRKQ2369856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a53b1d74748cd5afa660ae5b768c48c413e2c04b843b1e42ef0cef9e18e0f8c. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/ZZOPM2002194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba61b02c8212b91d63c6fefa6ebfdde4a8eb0a9eb12c883caa5b95e0c327125. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USLZJ2434348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9293791241885ef8fa7bcad9ee6164c197a0b055ab3324e1d574fdb0a6076129. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWDD2497822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9010343727701a33dd8906301ef25781d435b5cb9bb92eceee39d08e88b9576. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/QZWV32432115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba61b02c8212b91d63c6fefa6ebfdde4a8eb0a9eb12c883caa5b95e0c327125. 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/USLZJ2434348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd2298ecec8eeca58d9991c826f689d114a19885ea01514017e65f45c2c4019. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZZ8A2415830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f6af3ea8dfd4d551d81eec75a4b0cd7bfc895439085e2b31c1c86ce3366f91. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZZ8A2462593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba61b02c8212b91d63c6fefa6ebfdde4a8eb0a9eb12c883caa5b95e0c327125. 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/USLZJ2434348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301d6177a6b826f960ebe0ec5423b8f66fa7e0e1de9c55b097ae6a9cf3f57add. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZZ8A2462594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7765aea63b03ca27005743a98df3bd7aa688a14bfbf99ac101af63cc4248bd0c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZZ8A2462596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa232909db5a2b0f9c9f2648bedf933589235765d298a93e3269bdc35b1ad4f51. 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/QZZ8A2462597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d7d5abf6fe7979b7c3c4d85e1b533ef9db33100debb355bbf79d74398f3fd7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZZ8A2462599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad2b78bf8a563b6e05c80df50871815aa6a8591ea926a8276ef90e66de37003. 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/QZZ8A2462600.