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 0xc5a081de41dbe0a9b26f4946a6650423830ba58d864f5d9f7aa18e1fdb61a006. Chain 2 (Bitcoin): anchored in block 953896 (2026-06-16T06:05:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0fb6c062-3e2c-40af-87fc-e1ee514475f0.json and https://artists.proofprofile.net/proofs/artist/0fb6c062-3e2c-40af-87fc-e1ee514475f0.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 0xf9c5f8ad9569e522191a98430afc1efa7730417e59608bea2a20df5741b9641d. 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/CAZ600600323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d803c00e8d9c8a4d3e55fb20a466e12c0b321726509e11a287ab1a77c37d51. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CAZ600600324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d30890800f5c21f4c2e96b5d329f0463c7e723388f44559faf4fff1487f21d. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/CAZ600600325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb508c1cda9e56e15d0a6eb9d601e2f32b25596a0bd80fea3a4111fea456d454d. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/CAZ600600328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2385f10e57ec3efb60d7f137b4ce5c5409ead57acc0daf6ed7d4053887b322. 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/CAZ600600334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497dfd12ab45f976a7f05f5feefc0c58f1670b629c087edcc74df68598b2bea4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CAZ600600336.
Le Monde Change [2008] (feat. Narkoi) [Revu et corrigé]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02eae466a264cf6d704f2fbea592404d0769752aa47a6ce8ad455a622ba257f. 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/CAZ600820002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde59384af125efe76d609f260b1da439cd6208106e51379b2e9ef1bdb7280aa. 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/CAZ600820003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99245d526f94c8bddc87e20d84a4cca0ec75ff75ff832c070e455f72826f414. 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/CAZ600820004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880a5bf7bed11e10d78453125460376bfd51918494f5a6b36082f833087b297d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CAZ600820006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876ad511a229ab738f7400f8194c568b607e896a48fb08503ef495681d5e476a. 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/CAZ600820007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc4cceb253e5bc94ae1f8f70f93413aedf67693c0e12c0caaa6e7623e51566e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/CAZ600820008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17f2b43ae6acc14c111314fa13d502295fad4354f665f34252cbffc2250f4af1. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CAZ600820009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04e921315852edd06cf5a25ee641c2502f220b81e989066df5ac491425946b5. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CAZ600820010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf83d7fe161b66c329ab39678595eb6938b5266b9281ebfbcc06f2bb3010bf2e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CAZ600820012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cd4cb5b08e1e0e33c397ba1fc0af8757bdff023697059d823156dbe7a40363. 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/CAZ600820017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8bb080215a53cf0e838646a04d151116e238243e93b04406cb0dea6fe5cf6f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CAZ600820018.