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 0x33d5bb7b61cf5513ce0b02a55a1a99d780fe80b201955cf0ab2a1fa7b99f4aef. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f3df4d35-4600-41de-96ce-b000fde72572.json and https://artists.proofprofile.net/proofs/artist/f3df4d35-4600-41de-96ce-b000fde72572.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 0xf63be4fa47592596cb0f7fc6a62c1a28b94840f3f0d35e247a120372e0a0223c. 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/PT4CA2031137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b68ea45232089d408da67e43b26a082c1dea3419dc73bd2a2852ecfc6b3e05e. 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/PT4CA2032546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3955e70fd60f5fa8e0d5944a277b2ab3d594ff74b3ab7266c35f981e60648395. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/ESA011723038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149e08605cd400ef886e17f5eddbf09040b0ff3a10dd471a75e69bdc3481cc5e. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/PT4CA2330101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e41030e59b695590b9e89edf32a7b9802bb7f657c2b99358279f1cfa5a875b2. 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/PT4CA2330380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c112795933d749028e9d5ef36d8f23d300f67b3c9010cda3dc7225cd9cd8871. 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/QZTVM2413713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2948e956c910a591a9bc42a4b9e44d58e568a5fb69cc1cc1b5dac758cc8c20a1. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/QZGLM2533450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5db5000a15d7087e9d4e50c019978cdb1084a2af7c2bba1101f9b9c9b4deecc. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTRX2528032.