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 0x678b86f3b2977bb9efa490a144abd046247f2c6b203e586e2cce245c5cdec601. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f664929f-5bf6-4f47-8d37-ddfbf7908a54.json and https://artists.proofprofile.net/proofs/artist/f664929f-5bf6-4f47-8d37-ddfbf7908a54.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 0xb93f5c09f6c72341135c7cdabebe13a91f7cfb1e022e1b953c5d95632049134c. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USANG2453434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe12286c41299d0ba2971910c442e787f1bcc4bd836f547738e58234e5676fff. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USANG2453435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f42aba45c90c2a8f60a18b01d89411005b2c9ad08d7d6e3f6abab23f9e4d3a. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USANG2453436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454d6010ec00bb2562f38903fb19848d832c044bc5c7552ecb73eeaee9b6c00e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USANG2453437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30634dfc9e60d4e0e8fdeb4f24aa15d4c977b109bc72f0dd37f7c8f6c2b4316e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USANG2453439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2afa6b741c3f9bd6d7f41ef6a5618f473725d8e3b786ff41bf361740a25167a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USANG2485208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd664b52a54f24b74a7f3fc6ec856f743af598b87c0684ab46ac46029751e6c70. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USANG2485209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc4ffca2968ad5491fc5cac1f1e806d125db87e2a6cc17079a231218d6344a1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM3DF2407548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c4cb83b72b1b794e13d37a93c7e2d9ac4ef1b68a985c6a56b54939f3e51ace. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM3DF2416617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcd8441e0d38801b88a3413fec68469609aea31fe4325b3a329fffb08b5970d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QM3DF2416623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acae3b44554b882c190cc8c8243fe118b9b8886b586f9b698fafa7fe6ddece4. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/GBLFP2513333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e4c353c6e34969a9dc95a3aeebae6f976ea8a1913cff15f1d6d7a5f93d20b8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBLFP2513334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ececa0c2b375029a475104fdaa3400a9d81b51d711e956f180ea96ea1e15ba. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/GBLFP2513335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef7346ec0a5ad2b443dc7539e5787f488d4cdccc3a83e21c674127a45736ceb. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/GBLFP2513336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca118101b79f8690d510bb8611179d3b6899ef74a9becd5852ed92f8fcc0b02e. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/GBLFP2513337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86ce62cb01c975c67f7d79f8382797a507e2ab287843c9862a5a016485ee3cb. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/GBLFP2513338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e541e6e27dc857c35451afa4879570e60e376da2f6604c7746a502ed1d834c. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GBLFP2513339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fad1e7202d3cdae5d3c83038bb0ab26b3a8d1144b624f930aeea9810c993593. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GBLFP2513340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a64062c96430007d4c9cda478925e0c5da559a7b60cc16eba321c82e5b1d2a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GBLFP2513341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fba4e529e1452c895f6076808f122ef9fa928ef280dd99a548c4d7e11815e5. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/GBLFP2513342.