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 0x749526c65b93172269d29a3572242b843af1d4332011fb3d2e672ef92ba573d6. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2743f025-ceb8-4802-913a-5f8a7ea9449d.json and https://artists.proofprofile.net/proofs/artist/2743f025-ceb8-4802-913a-5f8a7ea9449d.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 0x949bda083cd826cd5f5e0c2f0573098fe39ae6b286ed11c7c46cbf35f0c1065b. 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/QZNMW2390536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d08dc39fd43f85b5d04752cfe301dd0eac9f67e863a6256accaf138bc366c6. 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/QZNMV2357976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebd7b9995a8c60b6c1ed3857baacf6dd47d7d2a5f3df4a6ba9e1fee78f0625e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNMU2293347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3857250c378db3ec2c9ebac1b39500fa2cc34c33c1a0dfefb55107afc820da. 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/QZNB82290403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa909cac4c4e9b5769447c3618f36c559cd8b1e4e62c8ed691e1c09d1107320e0. 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/QMDA62155726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d405978fbdaebda092fd7f4007fa91261be3261a394bd0dc130af7f77afa72. 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/QMDA62155762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6155969e51f9b22257338df7b0cf994906988d6cf6e05ed29d5ba09ffe8b9893. 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/QMDA62155799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692736d5ebabd510a3192abc0c963f37a53ae90053bf4037d61cade9faf9af05. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMDA62155810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e6c77392c34c003a4982866a3211e90814a96f3f601e09d4bc6420e44225f7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QMDA62155821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f246ed706dac18d9f68ee4c6463f69c2559703efd757e5e4ee5655a58dd61c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QMDA62155822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f87362cb79b8e721ee3b9c6d5b299ff8a39cfe71c58dc39380d9554cd28af87. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QMDA62155823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65ffe13e60a58d44fa66774a3663b9828f6eae73f51cfc6f4d47968ce367dbc. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QMDA62155826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852b3a0e40e2ddab971fc9c50a4bf2fe8cc5c4b446896ddb8d5da0542db20864. 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/QMDA62155831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ee9eff7932d244be7ae6d0cb2d5d1edd3e8b8a4ef0fbf3fc2568b46e51d8e8. 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/QMFMG2361864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd46b7cde530c70db696a8be58ac8a017925c8aee3ea7edeec730c0bc0221079. 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/QZSYP2208500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81e469d2f88ab5fe2b60f730b33a7af6887f8010fc80e5f214f1389764257a5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZSYP2273317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed58b8ca1d7201e19aa5723a222700bbb74794c34ba87ebe31415fa355da2c56. 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/QZSYP2217306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d405978fbdaebda092fd7f4007fa91261be3261a394bd0dc130af7f77afa72. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QMDA62155762.