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 0x5c3965399e1359c2507d9c3d838e12823749bcf95abac75fc5bd566e74f82316. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cbe7e52-71ba-4484-8c85-e1f24ebcd4ba.json and https://artists.proofprofile.net/proofs/artist/7cbe7e52-71ba-4484-8c85-e1f24ebcd4ba.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 0x878a318590243f4f7697586d66dedd5b4b218df3401ad6e993ccefe2c5882d77. 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/TCABX1474434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d04e5f763a69b4394ff5d27d32e3b163edf3919b6e0e83eaa5ed39a0b95f0b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T23:04:52Z), 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/TCABX1474437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2418c9570ea4339fe47652ad63115fcf69d654a83c6870e6d6e82f0a0f342ebc. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCABX1474439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162c4b710b697f544d9c659dc5986f6ea33007e9583b7f10fec79eedd0c34950. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:45:30Z), 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/TCABX1474442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43ce1b7544ea69de67674ee256a03bc18ed52697c8752b4710a2b7c5780af10. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:58:22Z), 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/TCABX1474448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd510b3b3277eaa766d760b4fa398d76961c57fcd530bcbb32c2bf16fd85272. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCACQ1609551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bc48a7d58da0664b8c3058f97b0c600922a407ccae1bc3961cddb848a7c98e. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCADD1792942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9409c587709701151e7a1c6bf905c60c87a67b63db4711612c7fa4e8a847aff. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:44:48Z), 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/TCADM1891984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edbb78b38c87c3b4672cdf4a84b69ca57819bf1bf60fc0c37564a7da0f86089. 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/TCADP1818122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2feec41e846868a98f1c6ff82a49f2231b1b7af140042c9d393decea59c301c. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/TCAEK1934228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2977d9f41fd9ec0443eb3d765ddce54ecd6267cca609a6f32e9b03fb9e49c4c4. 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/QZHZ41940090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841b4986302f1b7cbb76f7dbc39fa70394b6d58d320a349d27d93172466bedde. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T11:25:13Z), 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/QZHZ41940091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3761ff9afb1c8526a537675666c8c31590feb849d077c551d3b7f20a90185cf9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHZ41940093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef9d6f9a40e90ca6d0ef287996914db41f460102f7256c0f7971c3938c6a0f1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAGI2271272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4916add3f9e16d698f77c9de4bd394253b1ebb5ef39603f8c0a61189659c96. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/AEA3A2076016.