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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a089c5ad1013d7949ab0c58ae2fe3d37204518615fffb88bfe4b199b9d4263e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4125507-3a97-4b06-b9be-ddb70d30c246.json and https://artists.proofprofile.net/proofs/artist/b4125507-3a97-4b06-b9be-ddb70d30c246.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366ec39fa16ca391aa17f21bd14fd05ed38616f16935084e6d485fbc9fe4676b. 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/IL6721700063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f183adb70028d9eda0ee2e3265af9b872d2222acea30cedb3f4998f863eb017. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/IL6721700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92152926e91cb2f9001e537ca06a9678af035e9cf00782b188cb8653d3bf1e0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/IL6721700065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf07ffac27d6ecc4fe91bc2ef16cc9ab615661476111e8bc44eb0e75eec769d9. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/IL6721700411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6758be808ab3eb1046c26b47a2b834e6ddd4080f34f612efb57865968f1bfa5. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/IL6721700453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f91dae6aa0d3a93da2c270b96352083ce65a2c96fdf47a27a56d169d1e248f. 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/IL6721700454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020765d0b0adf6725933d7a33f81221d3c1939ca9c959287ab681f5cc5eb40b0. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:06:04Z), 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/IL6721700455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefe52f329d06de85519973d4c65a42986a89b3a8da9e90fa74e1ca82a9ac455. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/IL6721700457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f52f48b710841ace07531d09f3ff028f9cc3efccea7d37af93dec277049fed. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/IL6721700558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ea17610d5d1dd6e23462869ffc4afa69b87e53056f2e4a306ac55b9d5fa45c. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/IL6721700657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ea17610d5d1dd6e23462869ffc4afa69b87e53056f2e4a306ac55b9d5fa45c. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:42:29Z), 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/IL6721700657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b5e1e460cb8b3c66be59e527c5722c7a48760bfcd92c4592e2f68ea167ab1d. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/IL6721700658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2afb94c307b60d945e3531414c719d4346b6767e4c48bec1e08ca1cafb8d16c. 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/NLQ7C2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afd8394ae9cf8f8b8ed938775532ffc1b303ef7ced722e046268994896fee79. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/IL6721700684.
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