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 0x3caafbd276b83a0b016c9f4f231c260628e70a10550db5c0631f7b34ba3eb2c3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f18c10db-d156-4af0-b8ce-bce217970b93.json and https://artists.proofprofile.net/proofs/artist/f18c10db-d156-4af0-b8ce-bce217970b93.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 0x869d5437eece04592bca9762d37199747da6bf4571a67397cdadeee67ba786d2. 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/PLC062242763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dab9d76050379ec791d7e0dd62f2466eef686e8d5e8b74abbde15501bdd376. 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/PLC062247195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b359acd06900a934eaf89e881de9bbc21cf414bfd35ad5b338d8c0dfd31fd00. 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/PLC062372407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cc32d0287da0064ab0179066e39a5ace882e0677bda7f4e11dc85bf6b73199. 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/PLC062259720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a46e675880eb6e4c8673af9822ec5aa70bac21b6853f4b8fa4e1fa582094ed. 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/PLC062366887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cce98d86d3cc09510f0718fae3f51f4e36f7f70224ea4822e1920445fd1948. 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/PLC062372408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a097346eb906488fcb71fceef1fabdfd7b9afc081ad81b2b0db3a06b1c7f861. 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/PLC062372409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abbc1816ea868267902b5b8974e171ff443c78963714aefbffba378dd70154e. 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/PLC062372410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cc32d0287da0064ab0179066e39a5ace882e0677bda7f4e11dc85bf6b73199. 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/PLC062259720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4853768682f9c6ac01a06d938411c5f276d6780590fe44fb0af092bbecacf5. 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/CH6542246113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35033e47aed107c0c9d4e43881cc30ad9a4140cdabcef6fa92ddf2fe8298cc5a. 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/DEZC62445805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a46e675880eb6e4c8673af9822ec5aa70bac21b6853f4b8fa4e1fa582094ed. 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/PLC062366887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad003edbb5573a83d04893c715d1340f3311b8ea8008dd7582709712b9790742. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/PLC062362695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3456cc2b083770d7194ad3e98904aadf121be6853a0024e90f8e95847261789f. 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/PLC062239068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e7adba9b8eaec492958a071a91c08c8a5a7bb4487e051d25e019cde1b70006. 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/PLC062242010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5becd9ff5140d81a5749a6d0899da3e88d84f997584f379c9536d2766775fb63. 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/PLC062244710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcbf88dace12214df4a9153648480e9f4cbb1e79bdb0b66b3f044090d592cef. 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/PLC062252932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad003edbb5573a83d04893c715d1340f3311b8ea8008dd7582709712b9790742. 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/PLC062362695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcbf88dace12214df4a9153648480e9f4cbb1e79bdb0b66b3f044090d592cef. 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/PLC062252932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443c69a32c5cf3fa2ce77286b23addd5819ae96a529c06d201ffb2cc1b8ecbb8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CH7812342826.