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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 0x591f415da454f1347ecf81952709fdbf78611258006c3351a09b3ebc1eb7de42. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9bf14857-9ccf-45d0-91a6-75ad7d7e1f7a.json and https://artists.proofprofile.net/proofs/artist/9bf14857-9ccf-45d0-91a6-75ad7d7e1f7a.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 0x5218e4214a52e2b685877a4388a731426b5f2715b286652b182d842f7d94c6ab. 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/CAENV2587346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead8894777b5af701bc59078739bda32920acb9049ef7f75ebc3d726f689b34c. 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/CBEYJ2489753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1c52da684be8fb0a4166a48710189d419d7e62b2ed37b854f51bb6cbc2c082. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:45:01Z), 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/CALVP2583937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acdfa1b0759ef2c52090cd92b179155dd9645aaa0c6bc31d24f5c0baf8be62b. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T13:53:36Z), 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/CACWV2516880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb846e32ccc10b8568bdd87e9b153d392e60021f9f33107fe0d82e4bdc4d9bd55. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:45:40Z), 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/CBEYJ2489368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738f6a9b5ae5bf9b0141e02d2dd988eed5688b95af5830f518f3e6537e73f0a8. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZZ782479933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5004321922ecf082743f537087cb0b921223520e5619a89f41f6ec10c93108ee. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CALVP2583936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf2cde664e687ca78b148d545606bd0b042d8af60939204d8644d24865755f4. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:32:34Z), 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/CALVP2583938.