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 0xdf8900a7fb182c4a8c9b2b71d4ec2dd8b5a233b009cfd55538a67000a0b4368e. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f3bb43e-b377-42b4-92d8-34552beb6f3a.json and https://artists.proofprofile.net/proofs/artist/5f3bb43e-b377-42b4-92d8-34552beb6f3a.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 0x99866bb91a07c0ed6453fe859c077121f01528d21ba7df9f859cadbca1ec1b30. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMDA62224006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0ec0c37b862dc2f856b55371ff2e8dcc677b98e31cf699eceb5e0d044dc0c9. 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/QMDA62224016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548a49ca98b3e97c6a3db68456378eb0055efc7c5bcb3163db35fbd2b44b3f6b. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QMDA62223537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69b41d0bdf93feb384dc5b949e0bd74c18af5225deb5e134f03e50dd758bd2f. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QMDA62224127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8487a726fe6a5abc316d15181080843a1920d12a466720d9620c0c40fc32cf26. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMDA62224074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ae89abfe41f169ecd56e75eb1a6b66d5c33a43e94cef88a5173fd0286013ec. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMDA62223980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf9c77db59f3e8bb87eb50950bbe5110f8a3c387eb2ed67aae5698538adc6f8. 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/QMDA62223548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb3ce2e5e89edf17f9d6eb9bccecf7933fcf79298e5532e6cda54a26cfd5331. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZFYW2143375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05eb46ca8a94748ad707fb5a5b818c7eb21e326cc52965d5d3037b3ace990dc4. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZFYW2143376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd87d238211685d63a7eba568dec8d69aefdbb33d052061a7462fd828739778. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYW2143377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e7d32aa3c16985d59f1f4e4f6375a287736a65a6a1c5a63ae02e4c85196766. 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/QZFYW2143378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c45dc73676771d6955adb9989a14f2a7ad8af4bacab47ec3a1e12efd0d7878d. 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/QZFYW2143379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790c6063f1323c70e58dca230ac765317fbe5de90a2dd3d1691611cd7ac2e113. 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/QZFYW2143380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd8cfd2eef5de526507c841bbe09035fa522a51107d436d7fcb61af3d46531d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZFYW2143381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8061d5c414588ca12ad54804b0d1e9ddd3d553eb6c35ca77e07160d08c23c638. 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/QZFYW2143382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3085202bf65f4cfb01e1a026c50e772d70c20240b32797ca79ca187c628f3890. 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/US38Y2414630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbc4aee3362473a8a70007663aa8ea8d9dcc10d97fe5f66416f88eed2dd75b3. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/US38Y2414693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272bf9e81ab878bf7634647cd7886f35d3128930f1297544b85fce258a373266. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US38Y2414750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce329da233f8d9420e745f3b726fbaf230e68d65b1e77b3ffcc31c84672064d5. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US38Y2414694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeccc8abd0739bf34393072af6186f1b6f88364e69d397338ef0764ab9ab677e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/US38Y2414691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45dc62e306296f38e4d7399ae5abba449c84b7467e4b679620096fbae88c9bf. 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/US38Y2414689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c88cb5bec4c50af65fb953a75d30b8194dd5a13acde1b6e63a92be7c47022e. 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/QMFME2352978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1dd86a3ebe57d881092b884d69e63267fc1dcab55dc5251d91597df2e75b7ab. 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/QMDA72351772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863512ddf51c2d6e6189aa5aaa98a0b2c859aa1f4a1a1d85f4bcc1eac7ec80cb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMBZ92279998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fa32be9f23c1f6f4c0082ba58ce99672b41cae31e4e14e61ee6c5ba963ce83. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QM6P42219198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb172e0cb36c6cb2431951fe4c741b60084b3cccda5c52ece4c172c7ad9a4dc1d. 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/QZHN42091759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf192d03563a069af66e95e86f2d09773036f8f75181c9782c1275402398a9d. 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/QZHN42091761.