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 0x5f447e9204c381db21bacd2958343d330b523dcdce2263a72a2558c620771ccf. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9704183-d9f9-4b9b-83ac-62eb665a63ca.json and https://artists.proofprofile.net/proofs/artist/f9704183-d9f9-4b9b-83ac-62eb665a63ca.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 0x7fb6324099447ab492b8c366060595d40b727e952877cfa9536a9f211dca19dc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USASN1000929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4673e3d436de981986d44e0fb84f331a2ac74984bd8af95dfafff0660746cb2. 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/USASN1000930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de9fd49a85dd0489098e5f80dca4fbaef937e6406d9796a2771d03af9f4c8b2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USASN1000931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994c0ca0d6c5dfe8c3bfb4bcde9e47838a39d606f68c35a96446d1d09deaf857. 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/USASN1000932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07118e33d942c79513d312eda47ab9ac9e7921d807c24fe89692b4a9d77c7d7b. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), 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/USASN1000933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754e6d76dae071b0e93a39c612df69d329781b2a4078bf1cba4fdfea176aea68. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USASN1000934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfced2c46205cf9af9f9978bec8cc9388f548125933ca44056658a726868efe65. 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/USASN1000935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc202ccf13cf9b825e8c3ba220fe4e8880e98769b6bab40e78e1553b7f44db989. 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/USASN1000936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e93c55cb4e9ae830c6c53bc10d882f6502694f88de8748b7b0520f82f313f6. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USASN1000937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd84509b7c2c63eadc619fa00c4bf0e9bd2ad765a9930af01e5895976611b94. 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/USASN1000938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1307a83a1549f09c29eafc8152bb7c9a9b8b949a83cefa573b3059c4547df6c. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USASN1000939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e18e25108f284eac16f614fc1dfc936053d21bb5a457c5fc1793cc85be0a5b2. 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/USASN1000940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaf8c89388a15c2bb61af9ca88790ce6ee2f60867765eb2565eaea0c8063dea. 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/USASN1000941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b5f8920f7380683d2e7264a66ca1dfac47ac427b832610ccd10fe28e56493a. 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/USASN1000942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845330b18311dce12ae395dfa55f6e8466ece8e209bbaf181c911387bb50f927. 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/USASN1000943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc119b46445e1e1ca906e059e308c8eee6c2b058002943d6b8a0a6638b2300d0. 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/USASN1000944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4ccd90c89af29a388ef533479f196591312e5237f43f8df6050d48d64ba385. 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/USASN1000945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d0bfd4a5d351ff9e6acfb9da1dc9852b73ed36d293ef7e36346712c01f0fb8. 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/USMP60364006.