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 0x7afa3acec6286546dfe68dff29bc0eaf0948f82b82c2e5c10963ff5c15bf59ee. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/04a9bbff-44e1-4c0e-88d5-be890148cc6a.json and https://artists.proofprofile.net/proofs/artist/04a9bbff-44e1-4c0e-88d5-be890148cc6a.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 0xd21cfc5aa98aab1b5a9baadfdfe90740208c83a98a2e5c2bac6ebe321fd84986. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DERN42500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60eec617ca264cce0ad8015d62f1f8e5a9014f042fbbeb8954209d6f5319f917. 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/DERN42500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21cfc5aa98aab1b5a9baadfdfe90740208c83a98a2e5c2bac6ebe321fd84986. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DERN42500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87870bd2d09ce1f5baea1124b9d346cfbf075b261985b410fd381501e2fdd30. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/UKACT2401038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236d484007af8e46343581ff2cbe395cd116392d1964bf9ede255402416f094c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/US83Z2475812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a1a92e18c566f38bbf0a1d1ec5eef62bbe96fde89cf9c304b310a51ef7da93. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBLV62323514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2199b442654ef3fa0a1a2fbea4ef0cea34d93568abae63e9eb7d1c7ab10ba2c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US83Z2475808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf3e313a2d799089c3a0d247c28a21f4364e28efc9be1106c62e600946ccd30. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DERN42400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd532d0c2f537a6c57ce6b32961624a2ae3a099ae6403415ae6e1a280cb9d0d65. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DERN42100210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3e9308cc6dc88fb6543a845ebbb2af4a20dd9ced1e55d90d01dd2c9f8b0dee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DERN42100211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddda532db754cd56082fa5eeb5ba347044611f5748d0389aeb985a9899d5b613. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DERN42100214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e6f224350d0b589feea69ffef7003006bd9082a70fed4b676c1d60029c8590. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/DERN42100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99a41f7ecdb52c0d854aa1c5d98958ab097ef4b2f1d4c2f62231255a8a83286. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DERN42100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b9e9c17a99faf5008d7790aa358a5064284f0ee80f83e855b9eeb3f1b05a10. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DERN42100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c0f9d192c4d0ae22c8edcf104faeb6a6bdcc3f854931809dd6353e24cc33ae. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DERN41900159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77be37672e92c81c169ad39f6b3a96228b2d40d27c22bb34952b439d5e1276b7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DERN41800375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e123c2d34255ab6944057872abede68b99b8f2125ed0e96923153ce98903901. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DERN42000301.