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 0x67da76cd001be704b2f2c304718490a13a0af8990e5b655638ee8bb1eee2db0f. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7c3fab4-3ebe-4f5f-821f-0b516319940a.json and https://artists.proofprofile.net/proofs/artist/c7c3fab4-3ebe-4f5f-821f-0b516319940a.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 0x38896b886bbd292c52a9b6449073642ad8d049cffb42c0c568ed8637bb34bd14. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG732279473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71212a42125253cff721bea0d9b736cc8bae13699bf44ff6de8b743a84ae6158. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG732279479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa61b834ed7b48ebcb304d21bfb801db51c3a294908cadd04128eebc0f95f59. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/HKG732277873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d910ecff7c47d0ca706338b0738e7e6ac6ac61764e9a74a45fdde9808d7fd3d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:54:38Z), 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/HKG732279527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6794f0ad3a280a5b8240f83fc6e0ccefd92bdb560a2ab77756c7b8af15de3ce. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732279529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bbba685b93911a5ea494468305fe9346b3fb11643772e0aafd678b1e03c94f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG732279535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae169d296bf6fdd91ce1497ef7f826e172bab8e3b54b4fe93aab0aa1d5f8ca9d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732124256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784b0d228cf903fbfbf8689ecf20d81d40a26de55838a3bfbbeda41a368b6a15. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG732124258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe61877f1a3f0fd3efcd65672356df276f6c12679b49b301ab72c7fc2108bb6f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG732124284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e51232495aad647c0285b189fe40a4071c0a30e449bd2f9a92fc66f9016e2b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732124288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207a7a81e72715f97a324a4850f8af8e75f90e09c87fb3708f989945af092267. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732124276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136d6875644790755d870920144ab1682d1a7912812871a5fa2f8edff4dabe40. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG732124847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfe3cb50af906cf0a79b465e0d5fb41eb53335b73e71b0f1883b24b2ca7b7b0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG732124266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9747925cd36420708f7bdafecb3464760089d3779f9b1a84c6d6f68442624327. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG732124268.