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 0x6fc69821c7371750b0a6160402649e58848a81f159c8ce2babbc1250d985f190. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33a893ca-ac27-46a1-a58a-41948d4c22f1.json and https://artists.proofprofile.net/proofs/artist/33a893ca-ac27-46a1-a58a-41948d4c22f1.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 0xd1d54e1284d6f3c54277e4b86eae7786674d06f86ab07acd8681cdd48a309af7. 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/USFI87400417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d90c9741453def1713c66ac0ba682f778330e6bc5f81ef0e415f82e086166a. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/USFI87400418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a142b46aceabcd512c2b1f9bbace540e8607334f43233c02cffcdbcc524b3d. 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/USFI87400419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc267bb02816d7011b0bfc5234fc49072797743c3807364f67a95dfa3bf3cd4a9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USFI87400420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a95bfd98d4407d05176c9e139a1f179c1490c1cae515372b5b25ecd10ed749e. 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/USFI87400421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc874fe7cf30c8a329e269a1c7936e500af8353cb8689ff14d3e115b3ed713321. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USFI87400422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eadd2dd8962ca1106e8293948859486b1df21f4bbb9a30394da24065646c996. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USFI87400423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8143c12a6e49b8826cd4852f866207e865343ab9ae7bce70ebb10b4a94880001. 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/USFI87400424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c78933bb1428c25ba1d080be5e2d0133211b3a3a07af090ae5708f09ef988c. 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/USFI87400425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ced3e639da59c347aec9acbab45501a847a52b2bd0bf2de330d345ea1f1e35a. 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/USUMG0000704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c53f5f419b887be4187609f1808bca9d3fe8099b0ada8979fa75088bdbbdac. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USUMG0300069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc15b97c255fb5d42c3ac21f00de2a6ca94cbe7c5fb9bd37e8bfe6f9bda3aa4a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USUMG0300067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45dcf9ff1d64014d1d5b2b0b0e17c2d8533d268284470f868eeb58f8a765df8. 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/USUMG0300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceca299299d1c094eed6aeb064adc76386365c2cacef828e2e31d744fcc5bde9. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/USUMG0300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff3bdd9479594d437f11c21456d84a35112fa45cb12706f380d592b6a5a757b. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/USUMG0300071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0afa9fcb23f61d321381a50bd0e36bf264e7e07ea079731c69edf1b62c0e83. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USMC17554854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09c3e70c40d5aca106250aeb807e4de677f54ca2fa49ef5649d18505f6ebee5. 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/USUMG0300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a26e4f85632f55b4ccb7e50b426c288714ef1b35418ba0faf78a30de4d6da19. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USMC17549990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d9555b8b5e2a151303cdd0e535511c7df6f905f9d1f87d0cd51157ea2e6d67. 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/USUMG0300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5baec65a14819a308f997b70b81e5697e4d251751f550c16509b4a33d82f6a59. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/USSM11002621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4775703186300e75f0fe528fd940307ffd52b8ef0b5d014088ce3d2b4c994c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USSM11002614.