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 0x39b44f10b6cef82b8844a91ecba21c9774a53886710b25940cba75e33236c56b. 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/725c9ae3-2d49-4d64-aa40-5f3754791e37.json and https://artists.proofprofile.net/proofs/artist/725c9ae3-2d49-4d64-aa40-5f3754791e37.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xe95c490595021b72ba66665714399574c82d1bd3eeb9bd9cd224d264e096ba2a. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZFZ41909313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048ec136640cc8159e65175517fc75898d5ae56d78cd0b8e4936dc78fc5d4b13. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZFZ41909314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e47531df0d400e4df4235bda2e12211f702d1eccaf52fa71fe6d8946853c9b. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZHN81979491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0910f39594950b4d4d7a921f29b1f7e12a8b648575a0f662f4861c50f7ec5673. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN81979493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638ca056fba0257d60c7a7bf076370cbb9342a1a5d70a609924d8da843aeb4bb. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZHN81979494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a70467fbee69dc6bf13e4d03d0dbf433b7b588521d7c535ee830879b1a6814. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZHN81979495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431e23b7f9cb5460a114811e9e3173c19edc96e3f92ad7b0a5b26979873273ae. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHN81979496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cfea015838db05a93437a0ece12247991cbeb7e8e4a5ef939229408ca2b67c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN81979498.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd03492e7acbf1fd068713b9a9d66a86cb6d8fc41c5c6c0df12ce3f6eb6341a3. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USFMA1900061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649faadd3e5cbb50e8b874f11ee392f26238508aa5e499593960b95a0f42c160. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USFMA1900090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d7c57a42146eddc27948fe034cb7c4fc78824da2efa70edce1d7d6881c18a2. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USFMA1900092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c50b885b06c159e8fa7f28402f78fe238d619b510f194f0160e1693a8d99b7. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USFMA1900093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb732f61b11d9323419e94d92864f46645de0d12dd8db523298260a1c3c631c2c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USFMA1900094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e38c7a1aacef270037406d0c1484b608e3ce20a8057f875d3c3d7231c50219. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USFMA1900095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3a5425e4722508868edc91e9a25cb4e0bfa9968d49ad2666d60c65f1d938ea. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USFMA1900266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c28ad88676a1bbbf34b407be32e6c667b6e58b4f85b1abb505a18ddd0cb3ae. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USFMA1900267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfa15d501af0d78689c20ae6d2dcd7bdba9ebcc04329d17f8322347ca57f3d4. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/USFMA1900264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a62ac5625f5d134358aa0c156070c7c6aa9a914f9abf5cb19699b9ea61d1c3. 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/USFMA1900269.